Abstract
The infrared spectrum of short-lived PH2Br has been observed by studying the reaction of P2H4 with gaseous HBr. The a-type fundamental bands ν3 at 812 cm−1 and ν4 at 399 cm−1 have been recorded with a resolution of ca. 5×10−3 cm−1, and their rotational fine structure has been observed. While the ν4 band and its hot band 2ν4−ν4 associated with the P–Br stretching reveal compact qP and qRJ-clusters, the HPBr bending fundamental ν3 shows a widely dispersed structure. A c-type Coriolis interaction of ν3 (Ka) with the unobserved ν6 state (Ka+1) at 795 cm−1, with resonance between Ka=1 and 2, was detected and analyzed. Comparison with results of ab initio calculations revealed in general excellent agreement.
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