Slobodan Milosevic | Institute for anthropological research, Zagreb (original) (raw)
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Papers by Slobodan Milosevic
Plasma Sources Science and Technology
Vacuum
ABSTRACT Low pressure inductively coupled plasma was investigated with a combination of two diagn... more ABSTRACT Low pressure inductively coupled plasma was investigated with a combination of two diagnostic techniques: catalytic probes and optical emission spectroscopy (actinometry). Three working gases were used: oxygen, oxygen–argon mixture and hydrogen. Concentrations of oxygen and hydrogen atoms were determined in a wide range of plasma parameters, with pressure ranging from 10 Pa to 70 Pa, applied power in the range from 50 to 250 W and at many different positions throughout the system (including the coil and afterglow in sample chamber). Concentrations of oxygen atoms were measured to be 1.3 × 1015 cm−3 in the middle of the coil and 4 × 1012 cm−3 in the regions of the chamber furthest from the coil. These spatially resolved concentrations are very important in plasma processing of materials, because radical concentrations over the sample determine plasma–material interactions. This work demonstrates that a relatively simple detection system can be practical and sufficiently successful in many plasma applications.
AIP Conference Proceedings
We present cavity ringdown spectra of lithium vapor generated in the heat-pipe oven. By closer in... more We present cavity ringdown spectra of lithium vapor generated in the heat-pipe oven. By closer inspection of absorption in the wavelength range corresponding to two-photon atomic Li(2s-3d), Li(2s-5d), Li(2s-6d) and quasiresonant Li(2p-4s) transitions we examine which of them could be candidates for observation of non-linear absorption by cavity ringdown spectroscopy. Measured molecular absorption lines from Li2(X1Sigmag+-B1Piu) band are identified by
The European Physical Journal D - Atomic, Molecular and Optical Physics
We report study of processes which occur in lithium vapour under two-photon excitation of the Li(... more We report study of processes which occur in lithium vapour under two-photon excitation of the Li(3D) state at 639.1 nm. A time-resolved technique has been used to measure the fluorescence from the Li(3D), Li(2P) and Li(3P) states. We have determined radiation rates for lithium atom densities in the range 1013-1014 cm-3 and laser powers (105-106 Wcm-2). The ground-state lithium atom
AIP Conference Proceedings, 1995
The recent progress in experimental and theoretical study of the alkali-group IIB intermetallic e... more The recent progress in experimental and theoretical study of the alkali-group IIB intermetallic excimers will be summarized. The main concern here is an understanding of interatomic interaction and collision dynamic in intermetallic systems. In the experiments, intermetallic vapors of amalgams are illuminated by a pulsed laser radiation. The reactive and non reactive energy transfer processes occur in the vapor or plasma, resulting with emission of the excited atoms and molecules. The analysis of the emission show a complexity of vapor and plasma conditions.Appropriate vapor mixture preparation, exciting laser wavelength selection and temporal spectral analysis allow discrimination among different collision processes. The photochemical reaction of excited alkali dimer with group IIB atoms, photoassociation of alkali and IIB atoms, quasi resonant and resonant alkali atom excitation with subsequent energy transfer to IIB atoms, are illustrated for Li-Zn and Li-Cd systems. Accompanying theoretical work provides interatomic potential energy curves necessary for interpretation of the observed emission. The emphasis is made on proper treatment of spin-orbit interaction which increases from Zn towards Hg. Recent calculation of potential energy surfaces for the Li2Zn system shows that exciplex can be formed in the excited state with considerable binding energy.
Fizika a, 1999
LiZn and LiCd vapour mixtures prepared in the heat-pipe oven are irradiated with pulsed excimer l... more LiZn and LiCd vapour mixtures prepared in the heat-pipe oven are irradiated with pulsed excimer laser emission at 308 nm. Temporal evolution of the fluorescence spectra is observed showing that different processes occur such as multiphoton excitation, collisional energy transfer, photochemical reaction, relaxation etc. Temporal change of the LiZn and LiCd blue-green diffuse bands spectral shape is observed and interpreted in terms of previous spectral simulations. The effective lifetimes of different spectral features are determined.
American Journal of Food Technology, 2016
AIP Conference Proceedings, 1993
ABSTRACT
AIP Conference Proceedings, 1993
ABSTRACT
AIP Conference Proceedings, 2001
Using resonance excitation of the lithium 2p atomic level in a lithium-cadmium vapor mixture we o... more Using resonance excitation of the lithium 2p atomic level in a lithium-cadmium vapor mixture we observed cadmium atomic transitions from a very high levels. Time dependent fluorescence intensity from various lithium and cadmium atomic levels is measured. Solving a system of 11 rate equations simulates the time evolutions of corresponding atom densities in the lithium and cadmium atomic energy levels. From the best fit we estimate rate coefficient for radiative collision Li(2p)+Cd(5 1 So)+hv 67 o.8 forming Li(2s)+Cd(5 3 P 0).
AIP Conference Proceedings, 1997
ABSTRACT New development in cold collisions has revived the interest in the process of photoassoc... more ABSTRACT New development in cold collisions has revived the interest in the process of photoassociation, because the free-bound transitions are very selective at extremely low temperatures. Some molecular systems where photoassociation has been observed in the past may now be studied in much greater detail than ever before. The photoassociation from the weakly bound Cs2 molecules at elevated and ultra cold temperatures will form peculiar molecules in their excited states in the intermediate internuclear distances.
AIP Conference Proceedings, 1997
ABSTRACT
AIP Conference Proceedings, 1995
AIP Conference Proceedings, 2001
We performed quasiresonant laser excitation of lithium vapor and lithium-zinc (cadmium) vapor mix... more We performed quasiresonant laser excitation of lithium vapor and lithium-zinc (cadmium) vapor mixture at 460.3 nm and 497.2 nm. Different processes producing initial Li(2p) level population are identified and discussed. In lithium-zinc (cadmium) vapor mixture three-body reactive collision of excited atoms is found responsible for formation of the excited LiZn or LiCd dimers.
Opt Commun, 2000
... D. Azinovi , I. Labazan , S. Milo evi * and G. Pichler. ... We attribute the observed oscilla... more ... D. Azinovi , I. Labazan , S. Milo evi * and G. Pichler. ... We attribute the observed oscillations to the precession of the polarization vector of the incident laser pulse around the magnetic field (of the earth B=0.36 G) vector , as has been shown and discussed by Dodd et al. [23]. ...
Physical Review A
ABSTRACT
The plume induced by pulsed laser vaporization of solid targets contains electrons, ions, excited... more The plume induced by pulsed laser vaporization of solid targets contains electrons, ions, excited and ground state atoms and molecules, clusters etc. Their concentrations and temperatures are changing rapidly in time, as plume expands. Ionic species are usually detected by mass
We use and develop various techniques such as optical emission spectroscopy, laser-induced breakd... more We use and develop various techniques such as optical emission spectroscopy, laser-induced breakdown spectroscopy, and cavity ring-down spectroscopy to characterize laser-induced and radiofrequency inductively coupled plasmas, and their combinations. Critical comparison of techniques is presented in the case of plasma treatment of various metallic and non-metallic materials.
Plasma Sources Science and Technology
Vacuum
ABSTRACT Low pressure inductively coupled plasma was investigated with a combination of two diagn... more ABSTRACT Low pressure inductively coupled plasma was investigated with a combination of two diagnostic techniques: catalytic probes and optical emission spectroscopy (actinometry). Three working gases were used: oxygen, oxygen–argon mixture and hydrogen. Concentrations of oxygen and hydrogen atoms were determined in a wide range of plasma parameters, with pressure ranging from 10 Pa to 70 Pa, applied power in the range from 50 to 250 W and at many different positions throughout the system (including the coil and afterglow in sample chamber). Concentrations of oxygen atoms were measured to be 1.3 × 1015 cm−3 in the middle of the coil and 4 × 1012 cm−3 in the regions of the chamber furthest from the coil. These spatially resolved concentrations are very important in plasma processing of materials, because radical concentrations over the sample determine plasma–material interactions. This work demonstrates that a relatively simple detection system can be practical and sufficiently successful in many plasma applications.
AIP Conference Proceedings
We present cavity ringdown spectra of lithium vapor generated in the heat-pipe oven. By closer in... more We present cavity ringdown spectra of lithium vapor generated in the heat-pipe oven. By closer inspection of absorption in the wavelength range corresponding to two-photon atomic Li(2s-3d), Li(2s-5d), Li(2s-6d) and quasiresonant Li(2p-4s) transitions we examine which of them could be candidates for observation of non-linear absorption by cavity ringdown spectroscopy. Measured molecular absorption lines from Li2(X1Sigmag+-B1Piu) band are identified by
The European Physical Journal D - Atomic, Molecular and Optical Physics
We report study of processes which occur in lithium vapour under two-photon excitation of the Li(... more We report study of processes which occur in lithium vapour under two-photon excitation of the Li(3D) state at 639.1 nm. A time-resolved technique has been used to measure the fluorescence from the Li(3D), Li(2P) and Li(3P) states. We have determined radiation rates for lithium atom densities in the range 1013-1014 cm-3 and laser powers (105-106 Wcm-2). The ground-state lithium atom
AIP Conference Proceedings, 1995
The recent progress in experimental and theoretical study of the alkali-group IIB intermetallic e... more The recent progress in experimental and theoretical study of the alkali-group IIB intermetallic excimers will be summarized. The main concern here is an understanding of interatomic interaction and collision dynamic in intermetallic systems. In the experiments, intermetallic vapors of amalgams are illuminated by a pulsed laser radiation. The reactive and non reactive energy transfer processes occur in the vapor or plasma, resulting with emission of the excited atoms and molecules. The analysis of the emission show a complexity of vapor and plasma conditions.Appropriate vapor mixture preparation, exciting laser wavelength selection and temporal spectral analysis allow discrimination among different collision processes. The photochemical reaction of excited alkali dimer with group IIB atoms, photoassociation of alkali and IIB atoms, quasi resonant and resonant alkali atom excitation with subsequent energy transfer to IIB atoms, are illustrated for Li-Zn and Li-Cd systems. Accompanying theoretical work provides interatomic potential energy curves necessary for interpretation of the observed emission. The emphasis is made on proper treatment of spin-orbit interaction which increases from Zn towards Hg. Recent calculation of potential energy surfaces for the Li2Zn system shows that exciplex can be formed in the excited state with considerable binding energy.
Fizika a, 1999
LiZn and LiCd vapour mixtures prepared in the heat-pipe oven are irradiated with pulsed excimer l... more LiZn and LiCd vapour mixtures prepared in the heat-pipe oven are irradiated with pulsed excimer laser emission at 308 nm. Temporal evolution of the fluorescence spectra is observed showing that different processes occur such as multiphoton excitation, collisional energy transfer, photochemical reaction, relaxation etc. Temporal change of the LiZn and LiCd blue-green diffuse bands spectral shape is observed and interpreted in terms of previous spectral simulations. The effective lifetimes of different spectral features are determined.
American Journal of Food Technology, 2016
AIP Conference Proceedings, 1993
ABSTRACT
AIP Conference Proceedings, 1993
ABSTRACT
AIP Conference Proceedings, 2001
Using resonance excitation of the lithium 2p atomic level in a lithium-cadmium vapor mixture we o... more Using resonance excitation of the lithium 2p atomic level in a lithium-cadmium vapor mixture we observed cadmium atomic transitions from a very high levels. Time dependent fluorescence intensity from various lithium and cadmium atomic levels is measured. Solving a system of 11 rate equations simulates the time evolutions of corresponding atom densities in the lithium and cadmium atomic energy levels. From the best fit we estimate rate coefficient for radiative collision Li(2p)+Cd(5 1 So)+hv 67 o.8 forming Li(2s)+Cd(5 3 P 0).
AIP Conference Proceedings, 1997
ABSTRACT New development in cold collisions has revived the interest in the process of photoassoc... more ABSTRACT New development in cold collisions has revived the interest in the process of photoassociation, because the free-bound transitions are very selective at extremely low temperatures. Some molecular systems where photoassociation has been observed in the past may now be studied in much greater detail than ever before. The photoassociation from the weakly bound Cs2 molecules at elevated and ultra cold temperatures will form peculiar molecules in their excited states in the intermediate internuclear distances.
AIP Conference Proceedings, 1997
ABSTRACT
AIP Conference Proceedings, 1995
AIP Conference Proceedings, 2001
We performed quasiresonant laser excitation of lithium vapor and lithium-zinc (cadmium) vapor mix... more We performed quasiresonant laser excitation of lithium vapor and lithium-zinc (cadmium) vapor mixture at 460.3 nm and 497.2 nm. Different processes producing initial Li(2p) level population are identified and discussed. In lithium-zinc (cadmium) vapor mixture three-body reactive collision of excited atoms is found responsible for formation of the excited LiZn or LiCd dimers.
Opt Commun, 2000
... D. Azinovi , I. Labazan , S. Milo evi * and G. Pichler. ... We attribute the observed oscilla... more ... D. Azinovi , I. Labazan , S. Milo evi * and G. Pichler. ... We attribute the observed oscillations to the precession of the polarization vector of the incident laser pulse around the magnetic field (of the earth B=0.36 G) vector , as has been shown and discussed by Dodd et al. [23]. ...
Physical Review A
ABSTRACT
The plume induced by pulsed laser vaporization of solid targets contains electrons, ions, excited... more The plume induced by pulsed laser vaporization of solid targets contains electrons, ions, excited and ground state atoms and molecules, clusters etc. Their concentrations and temperatures are changing rapidly in time, as plume expands. Ionic species are usually detected by mass
We use and develop various techniques such as optical emission spectroscopy, laser-induced breakd... more We use and develop various techniques such as optical emission spectroscopy, laser-induced breakdown spectroscopy, and cavity ring-down spectroscopy to characterize laser-induced and radiofrequency inductively coupled plasmas, and their combinations. Critical comparison of techniques is presented in the case of plasma treatment of various metallic and non-metallic materials.