CW all-optical triple-resonance spectroscopy of K2: Deperturbation analysis of the A1Σu+ (v ≤ 12) and b3Πu (13 ≤ v ≤ 24) states

G. Jong, L. Li, Thou-Jen Whang, W. C. Stwalley, John A. Coxon, Mingguang Li, A. M. Lyyra

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Abstract

The lowest vibrational levels v = 0 to 12 of the A1Σu+ state of K2, which are perturbed by the b3Πu state (13 ≤ v ≤ 24), were reexamined using all-optical triple-resonance (AOTR) spectroscopy. The experimental data were fitted by a nonlinear least-squares fit program to obtain deperturbed molecular constants for both the A1Σu+ and b3Πu states. Improved Dunham coefficients of the A1Σu+ state in the range 0 ≤ v ≤ 62 are determined from the deperturbed Tv and Bv values including the v ≤ 12 region of this work, the v = 12-18 region in the work of Ross et al. [J. Phys. B.20, 6225-6231 (1987)], and the v = 21-62 region in the work of Lyyra et al. [J. Chem. Phys.92, 43-50 (1990)]. The electronic matrix element for the A1Σu+ ∼ b3Πu interaction is Hel = 18.64(9) cm-1, in good agreement with the value of 18.4 (2) cm-1 found by Ross et al.

Original languageEnglish
Pages (from-to)115-135
Number of pages21
JournalJournal of molecular spectroscopy
Volume155
Issue number1
DOIs
Publication statusPublished - 1992 Jan 1

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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