Theoretical study of the 4p5nln′l′ autoionizing states of Rb excited by electron impact

Kupliauskiene, A; Kerevičius, Gintaras

doi:10.1088/0031-8949/88/06/065305

Cited by 8 publications

(9 citation statements)

References 23 publications

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“…Our calculations for excitation of the autoionizing states of Cs and Rb [18] have shown that the alignment parameters A K depend strongly on the configuration and total angular momentum J, but are very similar for the total orbital L and spin S angular momenta. It is sufficient to calculate the factors C = 1 + ∑ K A K α K P K (cos θ) only for the 5p 5 nln'l' J states which are a good tool to estimate the change of ratios of the intensities of Auger lines in the case of J = 1 / 2 and J ≥ 3 / 2 .…”

Section: Resultsmentioning

confidence: 81%

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Classification of the 5p⁵nln'l' LSJ energy levels of Cs excited by 30 eV electrons

Kerevičius¹,

Kupliauskiene²

2015

Lith. J. Phys.

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Theoretical investigation of the 5p5 nl(L1S1)n'l' LSJ autoionizing states of Cs was performed by using large scale configuration interaction calculations of energy levels, autoionization probabilities and excitation cross sections obtained in the Dirac–Fock–Slater approximation. Classification of calculated energy levels in the LSJ coupling scheme of angular momenta and simulation of the intensities of ejected Auger electron spectrum were performed. The classified energy levels in the region from the excitation threshold up to 17.365 eV and simulated intensity spectrum were used for identification of the experimental ejected-electron spectrum of Cs excited by 30 eV electrons.

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Section: Resultsmentioning

confidence: 81%

“…In addition, A K = 0 for all J = 1 / 2 states of the excited atom. Therefore, intensity ratios of the J = 1 / 2 and J > 1 / 2 lines observed at 75° can differ significantly from the ratios obtained when we exclude the asymmetry of the angular distribution of ejected electrons (see details in [18] for the core-excited Rb).…”

Section: Methods Of Calculationsmentioning

confidence: 80%

Classification of the 5p⁵nln'l' LSJ energy levels of Cs excited by 30 eV electrons

Kerevičius¹,

Kupliauskiene²

2015

Lith. J. Phys.

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“…However, the authors emphasized that there is little or no agreement between their experimental and calculated ejected-electron spectra that correspond to process (1). Meanwhile, as was shown in our recent studies of ejected-electron spectra of heavy alkalis Rb [17,18] and Cs [19], an accurate identification of the complex line structure may be feasible only if a certain minimum of data on processes (1) and (2) is available. These data are (i) experimental excitation thresholds and excitation dynamics of lines; (ii) calculated excitation energies, cross sections and decay rates of the states under study.…”

Section: Introductionmentioning

confidence: 98%

The 5p autoionization spectra of Ba atoms excited by electron impact: identification of lines

Hrytsko

Kerevičius

Kupliauskiene

et al. 2016

J. Phys. B: At. Mol. Opt. Phys.

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The ejected-electron spectra corresponding to the radiationless decay of 5p5 states in Ba atoms have been measured precisely for different incident electron energies ranging from the appearance of the first autoionizing line at 15.68 eV up to 140 eV. The spectra have been obtained at an observation angle of 54.7° and with incident-electron and ejected-electron energy resolutions of 0.2 eV and 0.07 eV, respectively. In total, 63 lines with excitation thresholds below 22 eV have been observed between 9.8 and 16.6 eV ejected-electron kinetic energy. Based on measured excitation energies, intensity behavior of lines, calculated excitation energies, cross sections and decay rates of states in 5p56s , 5p55d and 5p55d6snl configurations, assignments for all 63 lines are proposed. The excitation and decay processes for classified autoionizing states have been examined and compared with existing data. The excitation threshold of the subshell has been established at 15.61 ± 0.05 eV.

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“…2 3 P 0,1,2 and 3 F 2,3,4 most low-lying atomic AIS.Meanwhile, according to our previous analysis of ejected-electron spectra of heavy rubidium[15], caesium[16] and…”

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confidence: 86%

The energy structure and decay channels of the 4p⁶-shell excited states in Sr

Kupliauskiene¹,

Kerevičius²,

Borovik³

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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The ejected-electron spectra arising from the decay of the 4p nln l n l 5 ¢ ¢   autoionizing states in Sr atoms have been studied precisely at the incident-electron energies close to excitation and ionization thresholds of the 4p 6 subshell. The excitation behaviors for 58 lines observed between 12 and 21eV ejected-electron kinetic energy have been investigated. Also, the ab initio calculations of excitation energies, autoionization probabilities and electron-impact excitation cross sections of the states 4p nln l n l 5 ¢ ¢   (nl = 4d, 5s, 5p; n l ¢ ¢ = 4d, 5s, 5p; n l   = 5s, 6s, 7s, 8s, 9s, 5p, 6p, 5d, 6d, 7d, 8d, 4f, 5g) have been performed by employing the large-scale configuration-interaction method in the basis of the solutions of Dirac-Fock-Slater equations. The obtained experimental and theoretical data have been used for the accurate identification of the 60 lines in ejected-electron spectra and the 68 lines observed earlier in photoabsorption spectra. The excitation and decay processes for 105 classified states in the 4p 5 5s nl 2 , 4p 5 4d nl 2 and 4p 5 5snln l ¢ ¢ configurations have been considered in detail. In particular, most of the states lying below the ionization threshold of the 4p 6 subshell at 26.92eV possess up to four decay channels with formation of Sr + in 5s 1 2 , 4d 3 2,5 2 and 5p 1 2,3 2 states. Two-step autoionization and two-electron Auger transitions with formation of Sr 2+ in the 4p 6 S 1 0 ground state are the main decay paths for high-lying autoionizing states. The excitation threshold of the 4p 6 subshell in Sr has been established at 20.98±0.05eV.

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Theoretical study of the 4p⁵nln′l′ autoionizing states of Rb excited by electron impact

Cited by 8 publications

References 23 publications

Classification of the 5p⁵nln'l' LSJ energy levels of Cs excited by 30 eV electrons

Classification of the 5p⁵nln'l' LSJ energy levels of Cs excited by 30 eV electrons

The 5p autoionization spectra of Ba atoms excited by electron impact: identification of lines

The energy structure and decay channels of the 4p⁶-shell excited states in Sr

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Theoretical study of the 4p5nln′l′ autoionizing states of Rb excited by electron impact

Cited by 8 publications

References 23 publications

Classification of the 5p5nln'l' LSJ energy levels of Cs excited by 30 eV electrons

Classification of the 5p5nln'l' LSJ energy levels of Cs excited by 30 eV electrons

The 5p autoionization spectra of Ba atoms excited by electron impact: identification of lines

The energy structure and decay channels of the 4p6-shell excited states in Sr

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Theoretical study of the 4p⁵nln′l′ autoionizing states of Rb excited by electron impact

Classification of the 5p⁵nln'l' LSJ energy levels of Cs excited by 30 eV electrons

Classification of the 5p⁵nln'l' LSJ energy levels of Cs excited by 30 eV electrons

The energy structure and decay channels of the 4p⁶-shell excited states in Sr