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Title: Observation of perturbed 3snp double photoexcited Ryberg series of beryllium atoms

We observed the 3snp autoionizing Rydberg series of the Be atom in order to investigate the double-photoexcitation processes in two-s-electron systems. We employed synchrotron radiation to photoexcite the Be atoms and measured the generated Be{sup +} photoions by the time-of-flight method. The 3snp (n=3-9) photoexcitation resonance peaks with interloper state of 3p4s that converges to Be{sup +}(3p) threshold were observed. We derived the resonance parameters of 3snp series from a fitting procedure and obtained the Fano parameter q, energy position E{sub 0}, and resonance width {gamma}. These parameters are in good agreement with theoretical values. In the vicinity of the 3s5p state these experimental results clearly revealed the influence of the interloper 3p4s state, and the comparison with the numerical calculations indicates that more detailed calculations might be required to fully explain this phenomenon.
Authors:
; ; ; ; ;  [1] ;  [2] ; ;  [3]
  1. Department of Quantum Engineering and Systems Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656 (Japan)
  2. Meisei University, Hodokubo, Hino, Tokyo 191-8506 (Japan)
  3. Photon Factory, IMSS, KEK, Tsukuba, Ibaraki 305-0801 (Japan)
Publication Date:
OSTI Identifier:
20787108
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevA.73.042709; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; AUTOIONIZATION; BERYLLIUM; BERYLLIUM IONS; CATIONS; COMPARATIVE EVALUATIONS; ELECTRONS; MULTI-PHOTON PROCESSES; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; RESONANCE; RYDBERG STATES; SYNCHROTRON RADIATION; TIME-OF-FLIGHT METHOD