Ultraviolet Absorption Spectrum of Mercury in Low-Temperature Matrices

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Abstract
The uv absorption spectrum of mercury (3P1←1S0) in Xe, Kr, and Ar matrices has been investigated previously by other workers. The present study verifies the previously published results, extends the investigation to include Ne, N2, and O2 matrices, and analyzes the effects of changing the temperature of the matrix and the concentration of mercury in the matrix. With respect to the gas-phase transition at 2537 Å, in Ne, Ar, Kr, Xe, and N2 the observed absorptions are shifted to shorter wavelength by 940, 1270, 775, 10, and 845 cm−1, respectively. The half-widths of the absorptions increase with increasing temperature and with increasing mercury concentration. Xe and Kr matrices show partially resolved triplets, while N2 yields a broad doublet. The separate components of the multiplets respond differently upon warming of the matrices. For matrices with a mercury concentration >1%, additional features, presumably due to dimers or other aggregates, are observed.