Far-Infrared Absorption Spectra of Mercurous Halides

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Abstract
The absorption spectra of mercurous halides Hg2X2 (X=Cl, Br, and I) were measured at 300 and 90°K in the wavenumber region 400–10 cm−1. Besides the two strong bands observed previously for each mercurous halide, some weak bands were found at 371, 310, and 156 cm−1 for chloride, at 310, 223, 156, and 113 cm−1 for bromide, and at 112 cm−1 for iodide. By use of a simple crystalline lattice model, the observed infrared spectra of halides together with the Raman spectra reported already could reasonably be explained. New assignments for the spectra are proposed and some force constants are determined.