The 1P←1S transition of Ca was studied in Kr and Xe at 20°K. The transition was shifted to the blue relative to the gas. The short-wavelength component of the triplet shifted to the blue while the other two shifted to the red upon warming from 18 to 40°K. Codeposited Ca and Mg showed the same triplet structures with no shifts as when deposited individually in Xe thus confirming that the triplet structure is not due to long-range interactions between metal atoms. CaO was synthesized in Kr and Xe by the reaction Ca+2O2=CaO+O3 using 16O2 and 18O2. CaO showed a band system with the 0–0 band in Xe at 20 130 cm−1 and ωe′=890 cm−1. ωe″=794 cm−1 from the infrared spectrum. The matrix spectra do not correspond to any of the analyzed singlet systems of CaO. It is concluded that the X 1Σ state is not the ground state of CaO, which is probably a triplet.
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Brewer et al. (1972) studied this question.
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