Igor Izmailov | National Academy of Sciences of Ukraine (original) (raw)
Over 40 years of professional research activity in the field of pure and applied physics related to actual problems of modern laser, plasma, nano-,-bio-, and other emerging technologies, including multidisciplinary projects in the framework of national and international programs: STCU, NKAU, DFFD, RFBR, EC INTAS, EUREKA, FP7, HORIZON 2020. Area of expertise: atomic and molecular physics, condensed matter physics, laser physics, plasma physics, chemical physics, thermal physics, thermodynamics, fluid dynamics, physical-chemical kinetics, radiation, optics, spectroscopy, fluorescence, luminescence, chemiluminescence, photoluminescence, photochemistry, photocatalysis, electrical discharges, combustion, explosion, energy conversion, photonics, quantum electronics, lasers, sensors, waveguides, remote sensing, environmental monitoring, modeling, diagnostics and analysis. Over 200 publications in scientific journals and conference proceedings, 5 patents/author's certificates on inventions. Member of SPIE/Ukraine and Ukrainian Physical Society
Supervisors: Academician S.I. Pekar (past) and Professor V.A. Kochelap
Address: Prospect Nauki 45, Kiev, 03028 Ukraine
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Papers by Igor Izmailov
Article, Nov 13, 2020
Extreme UV plasma sources including UV ex-cimer lasers and excilamps are of great interest for mo... more Extreme UV plasma sources including UV ex-cimer lasers and excilamps are of great interest for modern science and technology , for instance, in nanolithography [1,2]. But despite the advances in excimer plasma physics, non-equilibrium kinetics of excimer plasma is still not entirely clear, in particular, regarding metastable excited species (MES). We tried to study this issue more detail. Experiments were carried out in various rare gas mixtures in different gas-discharge conditions using electrical and optical diagnostics. Measurements showed that excimer plasma processes are accompanied by the formation of long-lived MES. Computational simulation with 0D-kinetic and 1D-fluid models, considering excitation, ionization, dissociation-recombination, relaxation, collisional quenching, and UV radiation, revealed the most probable mechanisms of reactions in excimer plasma. The effects of metastables involving electronically excited molecules and atoms were examined. The study confirmed the role of MES in excimer plasma kinetics and indicated the way to more efficient UV plasma processing. [1] D. Basting , G. Marowsky , Excimer Laser Technology, Springer, 2005. [2] E. Sosnin, V. Tarasenko, M. Lomaev, UV and VUV excilamps, Lambert Academic Publishing, 2012.
Article, Oct 29, 2019
Non-equilibrium plasma in high-voltage gas discharges of the so-called apokamp type (blue jets, r... more Non-equilibrium plasma in high-voltage gas discharges of the so-called apokamp type (blue jets, red sprites) is of great interest for science and practice [1]. But, despite the advances in apokamp plasma physics, the mechanism of apokamp plasma chemistry is not very clear, in particular, concerning electronically excited reactive oxygen and nitrogen species (RONS). We tried to study this issue in more detail. Experiments were done in various oxygen-nitrogen mixtures employing electrical and optical diagnostics. Measurements showed that apokampic plasma processes are accompanied by the formation of long-lived RONS. Computational modeling by using 0D-kinetic and 1D-fluid models, including ionization, excitation, dissociation-recombination, vibrational relaxation, collisional quenching, and radiation, revealed the most probable mechanisms of plasma-chemical reactions in apokamp plasma jets. Effects of metastable RONS involving singlet oxygen O∗2(a,b), O∗(1D) and nitrogen N∗2(A), N∗(2D) were examined. The study confirms the role of long-lived RONS in apokamp plasma and indicated the way to a more efficient apokamp process. [1] E.A. Sosnin et al., JETP Lett. 103 (12):761 (2016).
Article, Nov 6, 2018
Kinetics of non-equilibrium plasma in dielectric barrier discharges (DBD) is of great interest fo... more Kinetics of non-equilibrium plasma in dielectric barrier discharges (DBD) is of great interest for science and practice [1]. But despite the advances in plasma physics, the mechanisms of plasma-chemical processes are not very clear, in particular, concerning electronically excited states (EES) of oxygen and nitrogen atoms and molecules. We tried to study this issue in detail. Experiments were done in various DBD in oxygen/nitrogen/argon mixtures, employing electrical and optical diagnostics. Measurements showed that DBD plasma processes are accompanied by the formation of EES. Computer modeling by using self-consistent 0D-kinetic and 1D-fluid models, including ionization, excitation, dissociation-recombination, vibrational relaxation, collisional quenching, and radiation revealed the most probable mechanisms of plasma-chemical transformations. Effects of metastable EES, involving singlet oxygen O*2(a, b), O*(1D) and nitrogen N*2(A), N*(2D) were examined. Our study confirmed the role of EES in the DBD plasma kinetics and indicated the way to more efficient plasma processing. [1] M.A. Lieberman, A.J. Lichtenberg, Principles of Plasma Discharges and Materials Processing, John Wiley & Sons, 2005.
Article, Oct 11, 2016
Plasma enhanced oxidizing and nitriding processes are of great interest for physics and applicati... more Plasma enhanced oxidizing and nitriding processes are of great interest for physics and applications. However, despite all advances in plasma technology, mechanisms of non-equilibrium plasma chemistry are not quite clear, particularly concerning reactive oxygen and nitrogen species (ROS/RNS) in metastable states. We tried to study this matter more detail. Experiments were done in a low temperature magnetron with a non-self-sustained glow discharge in oxygen/nitrogen/argon mixtures, employing electrical and optical diagnostics. Measurements showed that plasma processing is accompanied by the formation of electronically excited particles ROS/RNS. Computer modeling by using 0D-kinetic and 1D-fluid models including ionization, excitation, dissociation-recombination, vibrational relaxation, collisional quenching and radiation revealed the most probable mechanisms of plasma-chemical transformations. Effects of metastables of singlet oxygen O2*(a,b)and nitrogen N2*(A)as well as small but important radicals O*(1 D), N*(2 D) were also examined. Our study confirms the role of ROS/RNS in plasma kinetics and indicates the way toward more efficient oxygen and nitrogen plasma processing. [1] M.A. Lieberman, A.J. Lichtenberg, Principles of Plasma Discharges and Materials Processing, John Wiley & Sons, 2005
Article, Jul 8, 2016
In a nonequlibrium plasma of a gas-discharge HgBr lamp, the terminal electronic state of the HgBr... more In a nonequlibrium plasma of a gas-discharge HgBr lamp, the terminal electronic state of the HgBr(B–X) radiative transition with a peak wavelength of 502 nm remains populated for a relatively long time and is repeatedly excited to the upper state in collisions with plasma electrons. This transfer of the HgBr molecules from the ground state X to the excited state B is the main mechanism of formation of the light-emitting molecules especially when the lamp is excited by double current pulses. According to our simulations, due to the electron-induced transitions between HgBr(X) and HgBr(B), the output characteristics of the DBD lamp operating in a double-pulse regime are better than those of the lamp operating in a single-pulse regime. In the considered case, the peak power is calculated to increase by a factor of about 2 and the lamp efficiency increases by about 50%.
Conference paper: Optics and High Technology Material Science – SPO2015: 16th Intl Sci. Conf. devoted to International Year of Light and Light-based Technologies, 22-25 Oct 2015, Kyiv, Ukraine, Sci.Works, Taras Shevchenko Nat. Univ. Kyiv, Oct 19, 2015
The effects of electronically excited reactive oxygen (ROS) and nitrogen (RNS) species in metasta... more The effects of electronically excited reactive oxygen (ROS) and nitrogen (RNS) species in metastable states O2*(a,b), N2*(A) and other small but important radicals in the kinetics of non-equilibrium plasma-enhanced oxidation and nitriding are studied and analyzed in experiments and numerical simulations.
Article, May 24, 2015
A kinetic model of the working medium of a gas discharge excilamp on the B–X transition of mercur... more A kinetic model of the working medium of a gas discharge excilamp on the B–X transition of mercury bromide, HgBr, molecules has been proposed. The model explains the non-monotonic dependence of the excilamp radiation intensity on the partial pressure of mercury dibromide, HgBr2, molecules by the attachment of electrons to these molecules. HgBr(X) molecules were found to transit into the HgBr(B) excited state due to their collisions with high-energy electrons, thereby improving the excilamp characteristics.
Article, Nov 28, 2013
The kinetics of the superluminescence of lead atoms, 3P1->1D2 (722.9 nm) and 3P1->3P2 (405.8 nm) ... more The kinetics of the superluminescence of lead atoms, 3P1->1D2 (722.9 nm) and 3P1->3P2 (405.8 nm) at the fast adiabatic expansion and cooling of the detonation products of lead azide Pb(N3)2 in vacuum has been studied. The effects of the condensation and scattering of light from drop clusters in an optically active heterophase medium has been analyzed in order to interpret the experiments in laser detonation plasma-dynamic systems based on metal azides.
Uspekhi Fizicheskih Nauk, 2001
Physics-Uspekhi, Oct 1, 2001
An overview of optical effects in micrometer-sized droplets is presented. The fundamentals of mic... more An overview of optical effects in micrometer-sized droplets is presented. The fundamentals of microdroplet optics are expounded. The scope of the analyzed phenomena includes enhancement of the spontaneous emission probability, laser generation, Raman light scattering, changes in the rates of physicochemical processes, and peculiarities of action on droplets by high-power light pulses. It is emphasized that the knowledge acquired can be applied to droplet structure analysis based on the measurement of resonance positions and amplitudes in elastic or inelastic light scattering spectra.
Uspekhi Fizicheskih Nauk, 1998
Chapter, Feb 20, 1996
To look forward to new trends in modern gas lasers and their applations, the results of current t... more To look forward to new trends in modern gas lasers and their applations, the results of current theoretical and experimental studies on search of new active media for high-power short-wavelength gasdynamic and chemical lasers are reviewed.
The basic physical aspects (optical, kinetical, thermal and fluid dynamical) in operation of gas flow lasers on electronic transitions are discussed. The perspective electronically excited diatomic molecules (halogens, halkogens and other possible candidates from the elements of Group VI and VII) as the potential lasants, and exoenergic gas-phase reactions of radiative recombination of atoms (S + S, Cl + Cl, Br + Br and others) as the promising way to pump a high energy gain media in the gas flow are considered. The key spectral and kinetic characteristics (recombination efficiency, its branching ratio, quantum yield, rates of E-V-T energy relaxation, radiative lifetime, etc.) important for excitation of the (B − X) band systems of S 2, Cl 2, Br 2 and other molecules are analyzed. The initial thermodynamic parameters, gas mixture composition, pressure and temperature regimes and other conditions necessary for the population inversion and the light amplification sufficient for laser generation in recombining supersonic flows are searched and optimized. The complex strategy of research which includes the pre-laser gasdynamic modeling by ‘shock tube’ technique and photochemical modeling by ‘flash tube’ technique to understand a behavior of generator/amplifier laser system are proposed and tested.
As a result of conducted pre-laser studies, the principal possibilities to develop the new powerful laser sources for the wide range of wavelengths in visible and near-IR spectrum are found. Expected performance and advanced applications are discussed also.
Article, Mar 31, 1995
To state more precisely our knowledge of the vibrational energy transfer with Cl2 molecules in ac... more To state more precisely our knowledge of the vibrational energy transfer with Cl2 molecules in active media of the gas flow and chemical lasers, the nonequilibrium vibrational relaxation of the thermally heated and partially dissociated molecular chlorine in the supersonic flow is studied. Using experimental technique based on the sensitive spectroscopic diagnostics and numerical gasdynamic and kinetical modeling, the parameters of vibrational kinetics of molecular chlorine are evaluated. The effect of chemically active Cl atoms on the rate of V-T deactivation of Cl2 molecules is determined.
Article, May 4, 1993
Based on the measurements of the absolute emissivity of the thermally heated molecular chlorine i... more Based on the measurements of the absolute emissivity of the thermally heated molecular chlorine in the shock wave flow, the redetermination of radiative characteristics of the Cl2 B3(Pi)o+u yields X1(Sigma)+g and A1(Pi)1u yields X1(Sigma)+g electronic transitions was made with the aim of pre-laser studying a potential new laser active media. Reasons for errors in previous works are discussed.
Quantum Electronics, 1993
Not Available Bibtex entry for this abstract Preferred format for this abstract (see Preferences)... more Not Available Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints
Quantum Electronics, 1993
The stimulated-emission quantum yield of an electronically excited molecule is analyzed as a func... more The stimulated-emission quantum yield of an electronically excited molecule is analyzed as a function of the vibrational relaxation time. Optical gain saturation and a finite lifetime of the lower laser level are taken into account. Use of the theoretical model is illustrated in the example of optimizing the parameters of a XeF laser. The method used to determine the rate constants for VT relaxation of excimer molecules is discussed.
The Einstein coefficients and the stimulated emission cross sections have been calculated for far... more The Einstein coefficients and the stimulated emission cross sections have been calculated for far IR transitions of rare gas halides. The formation of inverse population has been predicted for certain vibrational-rotational levels of excimer molecules (EMs). The conclusion has been made about amplification of the IR radiation corresponding to the transitions between these levels.
Article, Dec 1, 1991
In report, current theoretical and experimental studies on development of a new molecular electro... more In report, current theoretical and experimental studies on development of a new molecular electronic transition gas flow lasers on the base of S+S, Cl+Cl, Br+Br radiative recombination reactions are reviewed.
A new method is proposed for direct transformation of electronic energy of metastable species in ... more A new method is proposed for direct transformation of electronic energy of metastable species in inverse medium into energy of waveguide modes localized in a dielectric waveguide. Different waveguide configurations are examined. Numerical calculations show that transformation efficiency can be as high as 15-20%.
Article, Nov 13, 2020
Extreme UV plasma sources including UV ex-cimer lasers and excilamps are of great interest for mo... more Extreme UV plasma sources including UV ex-cimer lasers and excilamps are of great interest for modern science and technology , for instance, in nanolithography [1,2]. But despite the advances in excimer plasma physics, non-equilibrium kinetics of excimer plasma is still not entirely clear, in particular, regarding metastable excited species (MES). We tried to study this issue more detail. Experiments were carried out in various rare gas mixtures in different gas-discharge conditions using electrical and optical diagnostics. Measurements showed that excimer plasma processes are accompanied by the formation of long-lived MES. Computational simulation with 0D-kinetic and 1D-fluid models, considering excitation, ionization, dissociation-recombination, relaxation, collisional quenching, and UV radiation, revealed the most probable mechanisms of reactions in excimer plasma. The effects of metastables involving electronically excited molecules and atoms were examined. The study confirmed the role of MES in excimer plasma kinetics and indicated the way to more efficient UV plasma processing. [1] D. Basting , G. Marowsky , Excimer Laser Technology, Springer, 2005. [2] E. Sosnin, V. Tarasenko, M. Lomaev, UV and VUV excilamps, Lambert Academic Publishing, 2012.
Article, Oct 29, 2019
Non-equilibrium plasma in high-voltage gas discharges of the so-called apokamp type (blue jets, r... more Non-equilibrium plasma in high-voltage gas discharges of the so-called apokamp type (blue jets, red sprites) is of great interest for science and practice [1]. But, despite the advances in apokamp plasma physics, the mechanism of apokamp plasma chemistry is not very clear, in particular, concerning electronically excited reactive oxygen and nitrogen species (RONS). We tried to study this issue in more detail. Experiments were done in various oxygen-nitrogen mixtures employing electrical and optical diagnostics. Measurements showed that apokampic plasma processes are accompanied by the formation of long-lived RONS. Computational modeling by using 0D-kinetic and 1D-fluid models, including ionization, excitation, dissociation-recombination, vibrational relaxation, collisional quenching, and radiation, revealed the most probable mechanisms of plasma-chemical reactions in apokamp plasma jets. Effects of metastable RONS involving singlet oxygen O∗2(a,b), O∗(1D) and nitrogen N∗2(A), N∗(2D) were examined. The study confirms the role of long-lived RONS in apokamp plasma and indicated the way to a more efficient apokamp process. [1] E.A. Sosnin et al., JETP Lett. 103 (12):761 (2016).
Article, Nov 6, 2018
Kinetics of non-equilibrium plasma in dielectric barrier discharges (DBD) is of great interest fo... more Kinetics of non-equilibrium plasma in dielectric barrier discharges (DBD) is of great interest for science and practice [1]. But despite the advances in plasma physics, the mechanisms of plasma-chemical processes are not very clear, in particular, concerning electronically excited states (EES) of oxygen and nitrogen atoms and molecules. We tried to study this issue in detail. Experiments were done in various DBD in oxygen/nitrogen/argon mixtures, employing electrical and optical diagnostics. Measurements showed that DBD plasma processes are accompanied by the formation of EES. Computer modeling by using self-consistent 0D-kinetic and 1D-fluid models, including ionization, excitation, dissociation-recombination, vibrational relaxation, collisional quenching, and radiation revealed the most probable mechanisms of plasma-chemical transformations. Effects of metastable EES, involving singlet oxygen O*2(a, b), O*(1D) and nitrogen N*2(A), N*(2D) were examined. Our study confirmed the role of EES in the DBD plasma kinetics and indicated the way to more efficient plasma processing. [1] M.A. Lieberman, A.J. Lichtenberg, Principles of Plasma Discharges and Materials Processing, John Wiley & Sons, 2005.
Article, Oct 11, 2016
Plasma enhanced oxidizing and nitriding processes are of great interest for physics and applicati... more Plasma enhanced oxidizing and nitriding processes are of great interest for physics and applications. However, despite all advances in plasma technology, mechanisms of non-equilibrium plasma chemistry are not quite clear, particularly concerning reactive oxygen and nitrogen species (ROS/RNS) in metastable states. We tried to study this matter more detail. Experiments were done in a low temperature magnetron with a non-self-sustained glow discharge in oxygen/nitrogen/argon mixtures, employing electrical and optical diagnostics. Measurements showed that plasma processing is accompanied by the formation of electronically excited particles ROS/RNS. Computer modeling by using 0D-kinetic and 1D-fluid models including ionization, excitation, dissociation-recombination, vibrational relaxation, collisional quenching and radiation revealed the most probable mechanisms of plasma-chemical transformations. Effects of metastables of singlet oxygen O2*(a,b)and nitrogen N2*(A)as well as small but important radicals O*(1 D), N*(2 D) were also examined. Our study confirms the role of ROS/RNS in plasma kinetics and indicates the way toward more efficient oxygen and nitrogen plasma processing. [1] M.A. Lieberman, A.J. Lichtenberg, Principles of Plasma Discharges and Materials Processing, John Wiley & Sons, 2005
Article, Jul 8, 2016
In a nonequlibrium plasma of a gas-discharge HgBr lamp, the terminal electronic state of the HgBr... more In a nonequlibrium plasma of a gas-discharge HgBr lamp, the terminal electronic state of the HgBr(B–X) radiative transition with a peak wavelength of 502 nm remains populated for a relatively long time and is repeatedly excited to the upper state in collisions with plasma electrons. This transfer of the HgBr molecules from the ground state X to the excited state B is the main mechanism of formation of the light-emitting molecules especially when the lamp is excited by double current pulses. According to our simulations, due to the electron-induced transitions between HgBr(X) and HgBr(B), the output characteristics of the DBD lamp operating in a double-pulse regime are better than those of the lamp operating in a single-pulse regime. In the considered case, the peak power is calculated to increase by a factor of about 2 and the lamp efficiency increases by about 50%.
Conference paper: Optics and High Technology Material Science – SPO2015: 16th Intl Sci. Conf. devoted to International Year of Light and Light-based Technologies, 22-25 Oct 2015, Kyiv, Ukraine, Sci.Works, Taras Shevchenko Nat. Univ. Kyiv, Oct 19, 2015
The effects of electronically excited reactive oxygen (ROS) and nitrogen (RNS) species in metasta... more The effects of electronically excited reactive oxygen (ROS) and nitrogen (RNS) species in metastable states O2*(a,b), N2*(A) and other small but important radicals in the kinetics of non-equilibrium plasma-enhanced oxidation and nitriding are studied and analyzed in experiments and numerical simulations.
Article, May 24, 2015
A kinetic model of the working medium of a gas discharge excilamp on the B–X transition of mercur... more A kinetic model of the working medium of a gas discharge excilamp on the B–X transition of mercury bromide, HgBr, molecules has been proposed. The model explains the non-monotonic dependence of the excilamp radiation intensity on the partial pressure of mercury dibromide, HgBr2, molecules by the attachment of electrons to these molecules. HgBr(X) molecules were found to transit into the HgBr(B) excited state due to their collisions with high-energy electrons, thereby improving the excilamp characteristics.
Article, Nov 28, 2013
The kinetics of the superluminescence of lead atoms, 3P1->1D2 (722.9 nm) and 3P1->3P2 (405.8 nm) ... more The kinetics of the superluminescence of lead atoms, 3P1->1D2 (722.9 nm) and 3P1->3P2 (405.8 nm) at the fast adiabatic expansion and cooling of the detonation products of lead azide Pb(N3)2 in vacuum has been studied. The effects of the condensation and scattering of light from drop clusters in an optically active heterophase medium has been analyzed in order to interpret the experiments in laser detonation plasma-dynamic systems based on metal azides.
Uspekhi Fizicheskih Nauk, 2001
Physics-Uspekhi, Oct 1, 2001
An overview of optical effects in micrometer-sized droplets is presented. The fundamentals of mic... more An overview of optical effects in micrometer-sized droplets is presented. The fundamentals of microdroplet optics are expounded. The scope of the analyzed phenomena includes enhancement of the spontaneous emission probability, laser generation, Raman light scattering, changes in the rates of physicochemical processes, and peculiarities of action on droplets by high-power light pulses. It is emphasized that the knowledge acquired can be applied to droplet structure analysis based on the measurement of resonance positions and amplitudes in elastic or inelastic light scattering spectra.
Uspekhi Fizicheskih Nauk, 1998
Chapter, Feb 20, 1996
To look forward to new trends in modern gas lasers and their applations, the results of current t... more To look forward to new trends in modern gas lasers and their applations, the results of current theoretical and experimental studies on search of new active media for high-power short-wavelength gasdynamic and chemical lasers are reviewed.
The basic physical aspects (optical, kinetical, thermal and fluid dynamical) in operation of gas flow lasers on electronic transitions are discussed. The perspective electronically excited diatomic molecules (halogens, halkogens and other possible candidates from the elements of Group VI and VII) as the potential lasants, and exoenergic gas-phase reactions of radiative recombination of atoms (S + S, Cl + Cl, Br + Br and others) as the promising way to pump a high energy gain media in the gas flow are considered. The key spectral and kinetic characteristics (recombination efficiency, its branching ratio, quantum yield, rates of E-V-T energy relaxation, radiative lifetime, etc.) important for excitation of the (B − X) band systems of S 2, Cl 2, Br 2 and other molecules are analyzed. The initial thermodynamic parameters, gas mixture composition, pressure and temperature regimes and other conditions necessary for the population inversion and the light amplification sufficient for laser generation in recombining supersonic flows are searched and optimized. The complex strategy of research which includes the pre-laser gasdynamic modeling by ‘shock tube’ technique and photochemical modeling by ‘flash tube’ technique to understand a behavior of generator/amplifier laser system are proposed and tested.
As a result of conducted pre-laser studies, the principal possibilities to develop the new powerful laser sources for the wide range of wavelengths in visible and near-IR spectrum are found. Expected performance and advanced applications are discussed also.
Article, Mar 31, 1995
To state more precisely our knowledge of the vibrational energy transfer with Cl2 molecules in ac... more To state more precisely our knowledge of the vibrational energy transfer with Cl2 molecules in active media of the gas flow and chemical lasers, the nonequilibrium vibrational relaxation of the thermally heated and partially dissociated molecular chlorine in the supersonic flow is studied. Using experimental technique based on the sensitive spectroscopic diagnostics and numerical gasdynamic and kinetical modeling, the parameters of vibrational kinetics of molecular chlorine are evaluated. The effect of chemically active Cl atoms on the rate of V-T deactivation of Cl2 molecules is determined.
Article, May 4, 1993
Based on the measurements of the absolute emissivity of the thermally heated molecular chlorine i... more Based on the measurements of the absolute emissivity of the thermally heated molecular chlorine in the shock wave flow, the redetermination of radiative characteristics of the Cl2 B3(Pi)o+u yields X1(Sigma)+g and A1(Pi)1u yields X1(Sigma)+g electronic transitions was made with the aim of pre-laser studying a potential new laser active media. Reasons for errors in previous works are discussed.
Quantum Electronics, 1993
Not Available Bibtex entry for this abstract Preferred format for this abstract (see Preferences)... more Not Available Bibtex entry for this abstract Preferred format for this abstract (see Preferences) Find Similar Abstracts: Use: Authors Title Return: Query Results Return items starting with number Query Form Database: Astronomy Physics arXiv e-prints
Quantum Electronics, 1993
The stimulated-emission quantum yield of an electronically excited molecule is analyzed as a func... more The stimulated-emission quantum yield of an electronically excited molecule is analyzed as a function of the vibrational relaxation time. Optical gain saturation and a finite lifetime of the lower laser level are taken into account. Use of the theoretical model is illustrated in the example of optimizing the parameters of a XeF laser. The method used to determine the rate constants for VT relaxation of excimer molecules is discussed.
The Einstein coefficients and the stimulated emission cross sections have been calculated for far... more The Einstein coefficients and the stimulated emission cross sections have been calculated for far IR transitions of rare gas halides. The formation of inverse population has been predicted for certain vibrational-rotational levels of excimer molecules (EMs). The conclusion has been made about amplification of the IR radiation corresponding to the transitions between these levels.
Article, Dec 1, 1991
In report, current theoretical and experimental studies on development of a new molecular electro... more In report, current theoretical and experimental studies on development of a new molecular electronic transition gas flow lasers on the base of S+S, Cl+Cl, Br+Br radiative recombination reactions are reviewed.
A new method is proposed for direct transformation of electronic energy of metastable species in ... more A new method is proposed for direct transformation of electronic energy of metastable species in inverse medium into energy of waveguide modes localized in a dielectric waveguide. Different waveguide configurations are examined. Numerical calculations show that transformation efficiency can be as high as 15-20%.