The absorption spectra of Ca atoms isolated in Ar, Kr, and Xe matrices at 16–20°K were obtained from 3000 to 7000 Å. In Kr and Xe matrices an asymmetric triplet was observed which was assigned to the 1P1←1S0 transition. In concentrated Kr: Ca samples new low-energy peaks appear which are assigned to well-defined metal aggregates, probably Ca2. The results for Ar: Ca could not be correlated with the other matrices, and it is suggested that atomic isolation was not attained in this matrix.
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Francis et al. (1972) studied this question.
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