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

Journal Article · Sat Apr 15 04:00:00 EDT 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.0· OSTI ID:20787108

Yoshida, Fumiko; Matsuoka, Leo; Osaki, Hiroyuki; Kikkawa, Satoshi; Fukushima, Yu; Hasegawa, Shuichi ^[1]; Nagata, Tetsuo ^[2]; Azuma, Yoshiro; Obara, Satoshi ^[3]

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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)

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.

• OSTI ID: 20787108
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 4 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

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