A strong, red, laser-excited fluorescence has been observed for Ca2 in inert gas matrices. Band origins were located using calcium-44 substitution and the spectroscopic constants were determined for the ground state van der Waals molecule in several different sites in solid argon and one site in solid xenon. Spectroscopic constants for the Ca2 excited state in solid neon (ω′e=118±2, ωex′e=0.3±0.1, and T0–0=15 150±20 cm−1) provide an estimate for the yet to be determined gas-phase constants for the upper state of this red transition. The observation of both unrelaxed and relaxed emission from Ca2 depending on the site and matrix is discussed in terms of guest–host interaction.
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Miller et al. (1978) studied this question.
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