Radiative transitions between lowest autoionizing states in sodium

Kupliauskiene, A

doi:10.3952/lithjphys.47108

Cited by 10 publications

(11 citation statements)

References 23 publications

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“…Since all previous classifications of ejected-electron lines were performed for spectra measured at high impact energies, namely at 750 eV and higher [22,26,31], we have reviewed these data for conformance with the excitation dynamics of lines observed in the present spectra. In addition, we have performed a comparative analysis of the spectroscopic interpretation of lines observed in photoabsorption [19,20,32,33] and optical [34][35][36] experimental spectra and in the theoretical calculations [37][38][39][40].…”

Section: Sodiummentioning

confidence: 99%

Excitation-autoionization cross section of alkali atoms by electron impact

Borovik¹,

Kupliauskiene²,

Zatsarinny³

2013

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

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The excitation-autoionization (EA) cross section of Na atoms was obtained experimentally in the form of normalized intensities of autoionizing spectra measured in the ejected-electron energy region between 25.5 and 33.7 eV for electron impact energies from the 2p6 excitation threshold at 30.77 up to 400 eV. The cross section exhibits the strong resonance behaviour in the near-threshold region and reaches the maximum value of 1.2 × 10−17 cm2 at 200 eV. By assigning the lines in ejected-electron spectra, the relative role of the 2p6 and 2s2 subshells as well as quartet and doublet levels in formation of the EA cross section was estimated. In particular, the autoionizing doublets in 2p53sns(n = 3 − 6), np(n = 3 − 6), nd(n = 3 − 4) configurations provide approximately 80% of the EA cross section at 200 eV impact energy. A comparative analysis of the EA cross sections for whole alkali group Li–Cs indicates that the near-threshold resonance behaviour of all cross sections is caused exclusively by the negative-ion resonances formed on the basis of the levels 1sn1l1n2l2 in Li and np5n1l1n2l2 in Na–Cs atoms. The relative EA contribution to the total single ionization cross section does not exceed 2% in Li and 5% in Na, and reaches 26% in K, 32% in Rb and 39% in Cs atoms.

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Section: Sodiummentioning

confidence: 99%

Excitation-autoionization cross section of alkali atoms by electron impact

Borovik¹,

Kupliauskiene²,

Zatsarinny³

2013

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

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“…Theoretical investigation of the 5p-core-excited autoionizing states of Cs is a complex task as the relativistic effects play a more important role compared with Na [1,2,3,4], K [5] or Rb [6]. The first attempt to perform the classification of Cs spectrum registered in an ultraviolet absorption experiment was made by Connerade [7] in jK notations.…”

Section: Introductionmentioning

confidence: 99%

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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“…Over the last 15 years, a remarkable progress has been made in experimental and theoretical studies of autoionization processes in alkalis. In particular, the systematic data on excitation dynamics, cross sections and spectroscopic classification of autoionizing levels arising from the excitation of subvalent shells were obtained for Li [12][13][14], Na [15,16], K [17][18][19] and Cs [20,21] atoms. As regards rubidium, by now the ejected-electron spectra have been reported only for two electron impact energy values of 27 and 400 eV [22].…”

Section: Introductionmentioning

confidence: 99%

The 4p⁶autoionization cross section of Rb atoms excited by low-energy electron impact

Borovik¹,

Roman²,

Kupliauskiene³

2012

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

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The autoionization cross section of rubidium atoms was obtained by measuring the total normalized intensities of ejected-electron spectra arising from the decay of the 4p 5 n 1 l 1 n 2 l 2 autoionizing levels. The electron impact energy range from the 4p 6 excitation threshold at 15.31 up to 50 eV was investigated. The cross section reaches the maximum value of (2.9 ± 0.6) × 10 −16 cm 2 at 21.8 eV impact energy. The general behaviours of the cross section and the role of particular autoionizing configurations in its formation were considered on the basis of large-scale configuration interaction calculations of energies, cross sections, autoionization probabilities in 5snl(n 7; l 4) and 4d nl(n 5; l 2) configurations as well as the measured excitation functions for the lowest levels in 5s 2 and 4d5s configurations. The resonance behaviour of the cross section between 15.3 and 18.5 eV impact energy is caused exclusively by the negative-ion resonances present close to the excitation thresholds of the (5s 2 ) 2 P and (4d5s) 4 P autoionizing levels. At higher impact energies, the autoionization cross section is composed of contributions from the high-lying quartet and doublet levels in 4d5s, 5p and 5s5p, 5d, 6s, 6p configurations. From the comparison of the present data with available experimental and calculated ionization cross sections, the 5s + 4p 6 direct ionization cross section of rubidium atoms was determined with the maximum value of (7.2 ± 2.2) × 10 −16 cm 2 at 36 eV. It was also found that the 4p 6 excitation-autoionization is the dominant indirect ionization process contributing over 30% of the total single ionization of rubidium atoms by electron impact in the 15.3-50 eV energy range.

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Radiative transitions between lowest autoionizing states in sodium

Cited by 10 publications

References 23 publications

Excitation-autoionization cross section of alkali atoms by electron impact

Excitation-autoionization cross section of alkali atoms by electron impact

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

The 4p⁶autoionization cross section of Rb atoms excited by low-energy electron impact

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Radiative transitions between lowest autoionizing states in sodium

Cited by 10 publications

References 23 publications

Excitation-autoionization cross section of alkali atoms by electron impact

Excitation-autoionization cross section of alkali atoms by electron impact

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

The 4p6autoionization cross section of Rb atoms excited by low-energy electron impact

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

The 4p⁶autoionization cross section of Rb atoms excited by low-energy electron impact