The electronic emission spectrum of IBr+ A2ΠX2Π

S. M. Mason, Richard Tuckett

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10 Citations (Scopus)


The A2Π–X2Π electronic emission spectrum of IBr+ has been recorded at a low rotational temperature in a crossed molecular beam/electron beam apparatus. Because IBr in the gas phase is in permanent equilibrium with I2(g) and Br2(g), it is necessary to subtract digitally the complete Br+2 A–X spectrum (which lies in the same spectral region as IBr+ A–X), recorded under identical conidtions, to recover the underlying IBr+ A–X spectrum. Emission is observed only from the lower Ω = 32 spin-orbit component of A2Π, since the majority of the Ω = 12 vibrational levels lie above the lowest I+ + Br dissociation energy. The spectrum shows the effects of the two bromine isotopes, and is analysed to yield spectroscopic constants for the two electronic states. The results are correlated with the most accurate photoelectron data for IBr, and with recent ion coincidence experiments on IBr+.
Original languageEnglish
Pages (from-to)383-391
JournalChemical Physics
Issue number2-3
Publication statusPublished - 1 Nov 1986


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