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

Abstract

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

Citation Formats

Yoshida, Fumiko, Matsuoka, Leo, Osaki, Hiroyuki, Kikkawa, Satoshi, Fukushima, Yu, Hasegawa, Shuichi, Nagata, Tetsuo, Azuma, Yoshiro, and Obara, Satoshi. Observation of perturbed 3snp double photoexcited Ryberg series of beryllium atoms. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.0.
Yoshida, Fumiko, Matsuoka, Leo, Osaki, Hiroyuki, Kikkawa, Satoshi, Fukushima, Yu, Hasegawa, Shuichi, Nagata, Tetsuo, Azuma, Yoshiro, & Obara, Satoshi. Observation of perturbed 3snp double photoexcited Ryberg series of beryllium atoms. United States. doi:10.1103/PHYSREVA.73.0.
Yoshida, Fumiko, Matsuoka, Leo, Osaki, Hiroyuki, Kikkawa, Satoshi, Fukushima, Yu, Hasegawa, Shuichi, Nagata, Tetsuo, Azuma, Yoshiro, and Obara, Satoshi. Sat . "Observation of perturbed 3snp double photoexcited Ryberg series of beryllium atoms". United States. doi:10.1103/PHYSREVA.73.0.
@article{osti_20787108,
title = {Observation of perturbed 3snp double photoexcited Ryberg series of beryllium atoms},
author = {Yoshida, Fumiko and Matsuoka, Leo and Osaki, Hiroyuki and Kikkawa, Satoshi and Fukushima, Yu and Hasegawa, Shuichi and Nagata, Tetsuo and Azuma, Yoshiro and Obara, Satoshi},
abstractNote = {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.},
doi = {10.1103/PHYSREVA.73.0},
journal = {Physical Review. A},
number = 4,
volume = 73,
place = {United States},
year = {Sat Apr 15 00:00:00 EDT 2006},
month = {Sat Apr 15 00:00:00 EDT 2006}
}
  • The multiphoton ionization spectra of several arene molybdenum tricarbonyls have been measured in the region 350--420 nm. These spectra exhibit allowed, two-photon resonant ns /sup 7/S/sub 3/ and nd /sup 7/D/sub J/ Rydberg series of neutral bare molybdenum atoms. Furthermore, the electric field inherent to the multiphoton ionization experiment also permits observation of the nominally forbidden np /sup 7/P/sup 0//sub J/ Rydberg series. A nonlinear least-squares regression of the Rydberg equation was used to obtain an improved ionization potential of molybdenum and the quantum defects of the three series.
  • Double-excitation Rydberg resonances of He below the {ital N}=2 threshold of He{sup +} were studied with an energy resolution of {congruent}4 meV by photoionization using synchrotron radiation. All three Rydberg series of {sup 1}{ital P{ital o}} resonances accessible by photoabsorption, including the hitherto missing'' (2{ital p},{ital nd}){sup 1}{ital P{ital o}} series, were resolved. This settles a long-standing discrepancy between experiment and theoretical predictions and establishes a firm basis for testing the accuracy of atomic multiconfiguration calculations.
  • Another laser-induced resonant transition in the v=n{minus}l{minus}1=2 metastable cascade of antiprotonic {sup 4}He atoms has been found by using a double-resonance technique. This was done by setting the first laser to the already known 470.724-nm resonance [(n,l)=(37,34){r_arrow}(36,33)], while the (38,35){r_arrow}(37,34) transition was searched for with the second laser. The resonant transition was found at a wavelength of 529.622{plus_minus}0.003 nm, showing excellent agreement with a recent prediction of Korobov. {copyright} {ital 1997} {ital The American Physical Society}
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