CrH and CrH2 molecules: ESR and optical spectroscopy at 4 °K

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Abstract
CrH and CrD molecules have been trapped in solid argon at 4 °K. Infrared spectra, when the large anharmonicity is accounted for, yield predicted gas phase vibrational parameters in the ground state ωe =1615 cm−1 and ωexe=17 cm−1. ESR spectra clearly establish that the molecule has a 6Σ ground state with zero‐field‐splitting ‖D‖=0.34(1) cm−1 in solid argon and approximate hyperfine coupling constants ‖A (H) ‖=49(5) MHz, ‖A⊥(53Cr) ‖=53(5) MHz, and g⊥?g∥=ge. Several ’’extra lines’’ (off‐principal‐axis absorptions) in the ESR support the assignment. CrH2 (and CrD2, CrHD) was observed in the IR spectra and may also have been detected in the ESR, which tentatively suggest a S=2 molecule with ‖D‖?0.02 cm−1.