Ultraviolet absorption cross sections of HgI2, HgBr2, and tin (II) halide vapors

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Abstract
The ultraviolet absorption cross sections of HgI2, HgBr2, and tin (II) halide vapors in the region 200–400 nm have been measured. The cross sections for the tin (II) halides are higher than the mercury (II) halides. The various ground and excited state HgX, SnX radicals, and X atoms (X=I, Br, Cl) produced as a result of photodissociation in this wavelength region are discussed. From the cross sections the radiative lifetimes of the excited HgX2 and SnX2 states are calculated to be ? 10−8 sec. The optical filtering properties of the vapors at elevated temperatures are briefly discussed.