Photoionization Study of the 2s22p2 (1D)ns(2D), 2s22p2 (1D)nd(2P), 2s22p2 (1D)nd(2S), 2s22p2 (1S)nd2D, and 2s22p3 (3P)np(2D) Rydberg Series of O+ Ions via the Modified Atomic Orbital Theory (original) (raw)
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Modified Atomic Orbital Theory of the O+ Ion Originating from 2D0 and 4S0 Metastable States
Journal of Applied Mathematics and Physics
We report in this paper energy positions of the 2D 0 _2s 2 2p 2 (1 D)nd(2 F); 2D 0 _2s 2 2p 2 (1 D)nd(2 D); 2D 0 _2s 2 2p 2 (1 D)nd(2 P); 2D 0 _2s 2 2p 2 (1 D)ns(2 D); 2D 0 _2s 2 2p 3 (3 D)np(2 P); 2D 0 _2s 2 2p 3 (3 D 0)np(2 F), and 4S 0 _2s 2 2p 3 (5 S 0)np(4 P) Rydberg series in the photoionization spectra originating from 2D 0 and 4S 0 metastable states of O + ion. Calculations are performed up to n = 20 using the Modified Orbital Atomic Theory (MAOT) [1]. The present results are compared to the experimental data of Aguilar et al. [2] which are the only available values. The accurate data presented in this work may be a useful guideline for future experimental and other theoretical studies.
International Journal of Advanced Research, 2021
In this present work, we have calculated the energies positions of the 2s22p2(1D)nd2P, 2s22p2(1D)nd2S, 2s22p2(1D)ns 2D, 2s22p2(1S)nd2D and 2s2p3(3P)np2D Rydberg series in the photoionization spectra from the 2P° metastable state of the O+ ion. Calculations were performed up to n = 40 applyingthe Screening Constant by Unit Nuclear Charge (SCUNC) via its semi empirical formalism. The quantum defect and the effective charge are also calculated.The results agree within 98% to Aguilars experimental data, and with Sows theoretical results to within 99%. These data can be a useful guideline for future experimental and theoretical studies.
Photoionization Study of Cl II, Ar II and Kr II Ions Using the Modified Atomic Orbital Theory
Journal of Modern Physics, 2018
Resonance energies of the Cl II-[3s 2 3p 3 (2 D 5/2)]nd and [3s 2 3p 3 (2 P 3/2)]nd, Ar II-3s 2 3p 4 (1 D 2)ns, nd and of the Kr II [4s 2 4p 4 (1 D 2)]ns, nd and 4s 2 4p 4 (3 P 2 , 3 P 1)]ns, 4s 2 4p 4 (3 D 2)]ns, nd and 4s 2 4p 4 (3 D 2 , 1 S 0)]ns, nd Rydberg series are reported. Natural widths of the Ar II-[3s 2 3p 4 (1 D 2)]ns, nd series are also reported. Calculations are done in the framework of the Modified Atomic Orbital Theory (MAOT). Excellent agreements are obtained with available theoretical and experimental data. High lying accurate resonance energies up to n = 40 are tabulated. The possibility to use the MAOT formalism report rapidly with an excellent accuracy the position of the excitation resonances as well as their width within simple analytical formulae is demonstrated.
Photoionization of Metastable O+ Ions: Experiment and Theory
Physical Review Letters, 2001
High-resolution absolute experimental measurements and two independent theoretical calculations were performed for photoionization of O 1 ions from the 2 P o and 2 D o metastable levels and from the 4 S o ground state in the photon energy range 30-35.5 eV. This is believed to be the first comparison of experiment and theory to be reported for photoionization from metastable states of ions. While there is correspondence between the predicted and measured positions and relative strengths of the resonances, the cross-section magnitudes and fine structure are sensitive to the choice of basis states.
Absolute Photoionization Cross Section Measurements of O ii Ions from 29.7 to 46.2 eV
The Astrophysical Journal Supplement Series, 2003
Photoionization spectra have been recorded in the 4s, 4p and 3d resonance regions for the Kr Iisoelectronic sequence using both the dual laser produced plasma technique (at DCU) to produce photoabsorption spectra, and the merged ion beam and synchrotron radiation technique (at ASTRID) to measure absolute photoionization cross sections. Profile parameters are compared for the 4s − np resonances of Rb + and Sr 2+. Many new 4p → ns, md transitions are identified with the aid of Hartree-Fock calculations, and consistent quantum defects are observed for the various ns and md Rydberg series. Absolute single and double photoionization cross sections recorded in the 3d region for Rb + and Sr 2+ ions show preferential decay via double photoionization. This is only the second report where both the DLP technique and the merged beam technique have been used simultaneously to record photoionization spectra, and the advantages of both techniques (i.e. better resolution in the case of DLP and values for absolute photoionization cross sections in the case of the merged beam technique) are highlighted.
Theoretical investigation on photoionization from Rydberg states of lithium, sodium and potassium
Journal of Physics B: Atomic and Molecular Physics, 1976
Photoionization cross sections for s. p and d Rydberg states of Li, Na and K have been computed in the framework of a single-electron model (non-relativistic) by using a parametric central potential. The evolution of the non-hydrogenic behaviour of photoionization cross sections near threshold is studied along Rydberg series; non-hydrogenic characters are particularly large for all the tis series and for the up series of K. The validity of the method is discussed and it appears that the onp and und cross sections are more reliable than the on, cross sections. Our results are compared to experimental data and other theoretical results, mainly provided by the quantum-defect theory. The agreement between the various results is generally very good for the unp and ond cross sections; the agreement is satisfactory even for the most unfavourable cases provided by the U,,, cross sections of Na and K.
K-shell photoionization of O+ and O2+ ions: Experiment and theory
Absolute cross sections for the single and double K-shell photoionization of carbonlike O2+ and nitrogenlike O+ ions were measured in the 526–620-eV photon energy range by employing the ion-photon merged-beam technique at the SOLEIL synchrotron radiation facility. High-resolution spectroscopy up to E/E ≈ 5300 was achieved. Rich resonance structures observed in the experimental spectra are analyzed and identified with the aid of R-matrix and multiconfiguration Dirac-Fock (MCDF) methods. For these two atomic oxygen ions of particular astrophysical interest we characterized the strong 1s → 2p and the weaker 1s → np (n > 2) resonances observed. A detailed comparison of the energies of the 1s → 2p resonances in the first members of the oxygen isonuclear sequencemeasured by synchrotron based experiments and the Chandra and XMM-Newton x-ray satellites is presented
arXiv: Atomic Physics, 2016
Absolute cross sections for the {\it K}-shell photoionisation of Be-like (O$^{4+}$) and Li-like (O$^{5+}$) atomic oxygen ions were measured for the first time (in their respective {\it K}-shell regions) by employing the ion-photon merged-beam technique at the SOLEIL synchrotron-radiation facility in Saint-Aubin, France. High-resolution spectroscopy with E/$\Delta$E approx\approxapprox 3200 ($\approx$ 170 meV, FWHM)was achieved with photon energy from 550 eV up to 670 eV. Rich resonance structure observed in the experimental spectra is analysed using the R-matrix with pseudo-states (RMPS) method. Results are also compared with the screening constant by unit nuclear charge (SCUNC) calculations. We characterise and identify the strong rm1srightarrow2p\rm 1s \rightarrow 2prm1srightarrow2p resonances for both ions and the weaker rm1srightarrownp\rm 1s \rightarrow nprm1srightarrownp resonances ($ n \ge 3$) observed in the {\it K}-shell spectra of O$^{4+}$.