High-resolution laser excitation spectroscopy of the (A)over-tilde(2)Pi(000) - (X)over-tilde(2)Sigma(+)(000) transition of BaOH

J. -G. Wang, J. D. Tandy, P. F. Bernath

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Abstract

The high-resolution spectrum of the (A) over tilde (2)Pi(000) - (X) over tilde (2)Sigma(+)(000) transition of BaOH has been recorded using laser excitation spectroscopy. The BaOH molecules were synthesized through the reaction of Ba atoms with H2O2 in a Broida-type oven. Rotational and fine structure parameters have been determined for the (A) over tilde (2)Pi(000) state through a combined least-squares fit with the millimeter-wave pure rotational data of the (X) over tilde (2)Sigma(+) state. The Lambda-doubling constants observed for the (A) over tilde (2)Pi state are in poor agreement with the predictions of the pure precession model of the interactions between the (A) over tilde (2)Pi and the (B) over tilde (2)Sigma(+) states of BaOH. In addition to the bands of the (A) over tilde (2)Pi(000) - (X) over tilde (2)Sigma(+)(000) transition, three bands located at similar to 11443 cm(-1), similar to 12013 cm(-1) and similar to 12505 cm(-1), respectively, were also observed and analyzed but their vibrational and electronic assignments are not clear. Possible assignments of the three unidentified bands are discussed based on the derived spectroscopic constants and the vibrational, assignments of previous low-resolution work. (C) 2008 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)31-36
Number of pages6
JournalJOURNAL OF MOLECULAR SPECTROSCOPY
Volume252
Issue number1
DOIs
Publication statusPublished - Nov 2008

Keywords

  • High-resolution
  • Laser excitation
  • BaOH
  • DOUBLE-RESONANCE SPECTROSCOPY
  • FOURIER-TRANSFORM SPECTROSCOPY
  • ELECTRONIC STATES
  • ROTATIONAL ANALYSIS
  • DIATOMIC-MOLECULES
  • CAOH
  • SROH
  • BAF
  • PARAMETERS
  • SPECTRA

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