Odd Rydberg spectrum of 40Ar(I): high-resolution laser spectroscopy and MQDT analyses of the nd, J = 4 levels and the ng′, J = 4 resonances

J. Bömmels, J. M. Weber, A. Gopalan, N. Herschbach, E. Leber, A. Schramm, K. Ueda, M. W. Ruf, H. Hotop

研究成果: Article査読

26 被引用数 (Scopus)

抄録

Using transverse resonant two-photon, single-mode laser excitation of metastable 40Ar(4s 3P2) atoms in a collimated beam in combination with a calibrated travelling Michelson interferometer involving digital fringe interpolation, we have measured the energies for the Ar(4p, J = 3 → nd, J = 4) transitions with principal quantum numbers n = 12-100 with a relative uncertainty of 8 × 10-8. The Rydberg atoms are formed in a region of low electric and magnetic fields and detected by electron transfer to SF6 molecules in a skimmed supersonic beam. A single-channel quantum defect analysis of the experimental data is performed, revealing weak perturbations of the n = 12 and 20 levels by interaction with the Ar(2P 1/2 7g′, J = 4) and Ar(2P 1/2 8g′, J = 4) levels, respectively. The value for the ionization energy of the 40Ar+(2P3/2) limit has been determined as 21 647.076(2) cm-1 relative to the 40Ar(4p, J = 3) level and as 127 109.836(3)(±0.05) cm-1 relative to the ground state of 40Ar (see also note added in proof). Low-lying autoionizing ng′, J = 4 resonances (n = 9-13) have been investigated and their quantum defects and reduced width determined for the first time. A multichannel quantum defect theory analysis yields an estimate (0.76 cm-1) for the energy separation between the perturbed 20d level and the perturbing 8g′ level, predicts the transition intensity to the 8g′ level to be much weaker than that to the 20d level and shows that the g′-g coupling in the autoionization region is much stronger than the g′-d coupling determined from the 8g′-induced perturbation in the discrete nd, J = 4 spectrum.

本文言語English
ページ(範囲)2399-2414
ページ数16
ジャーナルJournal of Physics B: Atomic, Molecular and Optical Physics
32
10
DOI
出版ステータスPublished - 1999 5月 28
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 凝縮系物理学

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