Variation of Br quadrupole coupling with isotopic substitution in methyl bromide

John R. Williams, Stephen G. Kukolich

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The J = 0 ← 1 transitions in CH379Br (I), CH381Br (II), CD379Br (III), and CD381Br (IV) were measured using a Stark-cell spectrometer constructed from C-band waveguide. High-resolution spectra yielded precise values for the bromine quadrupole coupling strength. Values obtained were eqQ(I) = -577.08 ± 0.15 MHz, eqQ(II) = -482.18 ± 0.15 MHz, eqQ(III) = -575.66 ± 0.15 MHz, and eqQ(IV) = -480.89 ± 0.15 MHz. The observed center frequencies for the J = 0 ← 1 transitions are ν0(I) = 19136.35 ± 0.03 MHz, ν0(II) = 19063.62 ± 0.03 MHz, ν0(III) = 15429.23 ± 0.03 MHz, and ν0(IV) = 15362.41 ± 0.03 MHz. A 0.26 ± 0.02% decrease in bromine quadrupole coupling is observed when the methyl group is fully deuterated. This is in agreement with, and supports interpretations given for, previous results on methyl chloride.

Original languageEnglish (US)
Pages (from-to)242-246
Number of pages5
JournalJournal of Molecular Spectroscopy
Volume74
Issue number2
DOIs
StatePublished - Feb 1979

ASJC Scopus subject areas

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

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