High resolution near-infrared electronic spectroscopy of HCBr

Bor Chen Chang, Trevor J. Sears

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45 Scopus citations


The rotationally resolved spectrum of the HCBr à 1A″(0,2,0)←X̃ 1A′(0,0,0) Ka = 0←1 transition between 12760 and 12850 cm-1 was obtained for the first time at Doppler-limited resolution using a transient frequency-modulation absorption technique. Rotational structure of HC 79Br and HC 81Br was identified and analyzed. The analysis shows R″(C-Br)=1.852 Å and R′'(C-Br)=1.749 Å. The observed band indicates a linear-bent transition. This yields an upper limit of approximately 1600 cm-1 for the barrier to linearity above the zero-point energy for the à 1A″ state. Perturbations caused by singlet-triplet interactions were also found in the observed spectrum. The analysis of these perturbations indicates a very low-lying ã3A″ state.

Original languageEnglish
Pages (from-to)2135-2140
Number of pages6
JournalJournal of Chemical Physics
Issue number6
StatePublished - 8 Aug 1996


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