Ultraviolet emission from argon and krypton matrices at 4.2 and 12°K containing trapped magnesium atoms has been observed at 2970 and 3236 Å, respectively. Magnesium atoms trapped in nitrogen, neon, and argon matrices containing more than 10% nitrogen do not show such emission. Evidence is presented which indicates that the emission bands result from excitation of the 1P ← 1S magnesium atomic absorption band at 2815 Å in argon. Several different proposals to account for the emission band are presented, including possible Mg2 transitions, electron-phonon coupling effects, and interactions between excited magnesium atoms and rare gas atoms.
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Knight et al. (1974) studied this question.
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