Further spectroscopic investigations of the high energy electronic states of SrOH: The (B)over-tilde '(2)Sigma(+)(000)-(A)over-tilde(2)Pi(000) and the (D)over-tilde(2)Sigma(+)(000)-(A)over-tilde(2)Pi(000) transitions

J.-G. Wang, M. J. Dick, P. M. Sheridan, S. Yu, P. F. Bernath

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Abstract

The (B) over tilde ('2)Sigma(+) and (D) over tilde (2)Sigma(+) states of SrOH were investigated using optical-optical double-resonance (OODR) spectroscopy. Rotational and fine structure parameters have been determined for these two states through a combined least-squares fit of the current OODR data along with the OODR data of the (C) over tilde (2)pi-(A) over tilde (2)pi transition, the optical data of the (A) over tilde (2)pi-(X) over tilde (2)Sigma(+) transition and the millimeter-wave pure rotational measurements of the (X) over tilde (2)Sigma(+) state. The spin-rotation constant, gamma, of the (B) over tilde'Sigma(+) state was found to be 0.002653 cm(-1), which is two orders of magnitude smaller than that of the (B) over tilde (2)Sigma(+) state (-0.1447 cm(-1)). This small T value suggests that this state arises from a Sr+ atomic orbital of mainly 6s sigma character. This atomic orbital assignment is also supported by the large rotational constant observed in the (B) over tilde'(2)Sigma(+) state and the similarity of the molecular constants to those of the (D) over bar (2)Sigma(+) state of CaOH. The rotational energy levels of the (D) over tilde (2)Sigma(+)state of SrOH were found to be largely perturbed, which prohibited the accurate determination of the spin-rotation constant in this state. This perturbation is most likely due to an interaction with a (2)Sigma vibronic component of the nearby (C) over tilde (2)pi state. (c) 2007 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)26-33
Number of pages8
JournalJOURNAL OF MOLECULAR SPECTROSCOPY
Volume245
Issue number1
DOIs
Publication statusPublished - Sept 2007

Keywords

  • SrOH
  • optical-optical double-resonance
  • alkaline-earth containing molecules
  • DOUBLE-RESONANCE SPECTROSCOPY
  • LASER SPECTROSCOPY
  • LYING STATES
  • MOLECULES
  • CAOH
  • EXCITATION
  • SYSTEM

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