First Experimental Determination and Theoretical Calculation of Partial Photoionization Cross Sections of Lithium over the Energy Region of Hollow Atomic States

Journel, L.; Cubaynes, D.; Bizau, J. M.; Moussalami, S. Al; Rouvellou, B.; Wuilleumier, F. J.; Voky, L.; Faucher, P.; Hibbert, A

doi:10.1103/physrevlett.76.30

Cited by 82 publications

(70 citation statements)

References 16 publications

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“…This observation applies particularly to doubly excited states while more systematic studies of triply excited states is of fairly recent origin [1][2][3][4][5]. Studies of nonradiative decays of triply excited states are still often limited to the lowest states, although recently the first observation of the Rydberg series associated with such states has been reported [6].…”

Section: Department Of Physics and Astronomy University Of Amsterdammentioning

confidence: 99%

Autoionization of Triply Excited Rydberg Series

Verbockhaven

Hansen

2000

Phys. Rev. Lett.

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Section: Department Of Physics and Astronomy University Of Amsterdammentioning

confidence: 99%

Autoionization of Triply Excited Rydberg Series

Verbockhaven

Hansen

2000

Phys. Rev. Lett.

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“…In fact, the authors specifically stated [3] "that the most striking aspect of the ion spectrum is the complete absence of any identifiable Rydberg series structure." Later measurements taking advantage of the final-state selectivity of photoelectron spectroscopy [4,5] suggested, however, that some of the observed structures could be identified as first members of Rydberg series. But their effect on partial cross sections for photoionization into final Li 1 ionic states with one vacancy in the 1s shell was very weak and no higher terms of any series were observed.…”

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“…The experimental setup and experimental procedure have been previously described [4,5]. A spectral resolution of 40 meV and an electron resolution DE͞E of 0.4% were used.…”

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“…The relative partial cross sections were put on an absolute scale by normalization to the measured photoabsorption cross section [10]. Details about our R-matrix calculations have been also given elsewhere [4].…”

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“…Simultaneous excitation of all three electrons can create hollow lithium states of the type nᐉn 0 ᐉ 0 n 00 ᐉ 00 with n $ 2 [1][2][3][4][5]. A calculation of some low-lying hollow lithium states in hyperspherical coordinates has been recently carried out [6] as a step towards the development of a classification scheme for triply excited states, analogous to the ͑K, T͒ A radial and angular correlation quantum numbers [7,8] used to describe the doubly excited states of helium [9].…”

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Experimental Observation and Theoretical Calculations of Rydberg Series in Hollow Lithium Atomic States

et al. 1997

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Several extended Rydberg series have been experimentally identified in triply excited states of hollow lithium, by use of electron spectrometry and synchrotron radiation at the Advanced Light Source. Energies, partial cross sections, and quantum defects have also been calculated using the R-matrix approximation. Our results show that the two inner electrons stay in a core-excited state of given symmetry while the behavior of the third electron is mostly governed by the nuclear potential screened by the two inner electrons. [S0031-9007(97)03826-X] PACS numbers: 32.80. Hd, 32.80.Fb, 32.80.Rm We present here the first experimental evidence demonstrating the existence of several extended Rydberg series in the hollow triply excited states of lithium. These new results, obtained using electron spectrometry and synchrotron radiation, are supported by our theoretical calculations made using the R-matrix approximation. We also explain why these Rydberg series have not been observed previously.The inner shell (K, or 1s) in a hollow atomic or ionic state is empty. Simultaneous excitation of all three electrons can create hollow lithium states of the type nᐉn 0 ᐉ 0 n 00 ᐉ 00 with n $ 2 [1-5]. A calculation of some low-lying hollow lithium states in hyperspherical coordinates has been recently carried out [6] as a step towards the development of a classification scheme for triply excited states, analogous to the ͑K, T͒ A radial and angular correlation quantum numbers [7,8] used to describe the doubly excited states of helium [9]. For future understanding an important question is whether hollow lithium states exist which can be regarded as heliumlike doubly excited Li 1 terms plus a running outer electron or is the configuration mixing so great that Rydberg states of this type are absent? An earlier experiment [3] measuring the yield of Li 1 ions by photoion spectrometry did not reveal such series features. In fact, the authors specifically stated [3] "that the most striking aspect of the ion spectrum is the complete absence of any identifiable Rydberg series structure." Later measurements taking advantage of the final-state selectivity of photoelectron spectroscopy [4,5] suggested, however, that some of the observed structures could be identified as first members of Rydberg series. But their effect on partial cross sections for photoionization into final Li 1 ionic states with one vacancy in the 1s shell was very weak and no higher terms of any series were observed.We have carried out new theoretical R-matrix calculations which predict the existence of eight Rydberg series between 150 and 160 eV, i.e., 1s 2 2s 2 S 1 hn ! ͓͑2s 2 1 S͒np͔ 2 P, ͓͑2s2p 3 P͒ns or nd͔ 2 P, ͓͑2p 2 3 P͒np͔ 2 P, ͓͑2p 2 1 D͒np͔ 2 P, ͓͑2s2p 1 P͒ns or nd͔ 2 P, and ͓͑2p 2 3 1 S͒np͔ 2 P. In Fig. 1, we show the calculated partial cross section for photoionization into the 1s2ᐉ final Li 1 FIG. 1. R-matrix calculation of partial cross section for photoionization of Li atoms into the ͑1s2ᐉ͒ 1,3 L final states of the Li 1 ion.

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Energies, fine structures, and transition rates of the core‐excited states in BeII

Deng

Gou

Han

et al. 2000

Int. J. Quantum Chem.

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ABSTRACT:The energies and fine structures of some doubly excited resonances of lithiumlike beryllium are calculated using the saddle-point variational method. A restricted variational method is used to extrapolate a better nonrelativistic energy. Relativistic and mass polarization corrections are included. Oscillator strengths, transition rates, and wavelengths are also calculated. The results are compared with other theoretical and experiment data in the literature.

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First Experimental Determination and Theoretical Calculation of Partial Photoionization Cross Sections of Lithium over the Energy Region of Hollow Atomic States

Cited by 82 publications

References 16 publications

Autoionization of Triply Excited Rydberg Series

Autoionization of Triply Excited Rydberg Series

Experimental Observation and Theoretical Calculations of Rydberg Series in Hollow Lithium Atomic States

Energies, fine structures, and transition rates of the core‐excited states in BeII

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