Probing electron correlation through radiative lifetime measurements upon inner-valence photoionization of Ne and Ar

This work demonstrates that electron correlation can have a strong effect on the radiative lifetime of atoms. We report measurements of the radiative lifetimes of inner-valence hole states, the 3s3p6 2S1 2 state of Ar+ and the 2s2p6 2S1 2 state of Ne+ by using the time-correlated single photon count...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2016-07, Vol.49 (14), p.145002-145007
Main Authors: Suzuki, Norihiro, Kosugi, Satoshi, Ito, Yumi, Inoue, Naoki, Nagoshi, Tatsuro, Kuze, Nobuhiko, Harries, James R, Sullivan, James P, Nagata, Tetsuo, Sokell, Emma, Koike, Fumihiro, Azuma, Yoshiro
Format: Article
Language:English
Subjects:
configuration interaction
Correlation
Correlation analysis
electron correlation
Mathematical analysis
Photoionization
Photons
Radiative lifetime
Synchrotron radiation
Time correlation functions
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Summary:This work demonstrates that electron correlation can have a strong effect on the radiative lifetime of atoms. We report measurements of the radiative lifetimes of inner-valence hole states, the 3s3p6 2S1 2 state of Ar+ and the 2s2p6 2S1 2 state of Ne+ by using the time-correlated single photon counting technique combined with photoionization by synchrotron radiation. Theoretical calculations utilizing the multi-configuration Dirac-Fock method agreed well with the experimental results. In particular, the radiative lifetime was found to depend very sensitively on the mixing of valence excited state configurations. While the Ne+ 2s2p6 2S1 2 state only has relatively weak inter-shell correlation, Ar+ 3s3p6 2S1 2 state has strong intra-shell correlation within the M-shell. This intra-shell correlation enhances configuration mixing and causes the radiative lifetime of the Ar+ 3s3p6 2S1 2 state to become very much longer than that of the Ne+ 2s2p6 2S1 2 state.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/49/14/145002