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 ohgr;e=1615 cm−1and ohgr;exe=17 cm−1. ESR spectra clearly establish that the molecule has a6Sgr; ground state with zero‐field‐splitting ‖D‖=0.34(1) cm−1in solid argon and approximate hyperfine coupling constants ‖A(H) ‖=49(5) MHz, ‖A⊥(53Cr) ‖=53(5) MHz, andg⊥?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 aS=2 molecule with ‖D‖?0.02 cm−1.
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