Abstract
Transitions between the spin-rotational levels of the 13CH radical in the v=0 level of the X 2 Π ground state have been detected by the technique of laser magnetic resonance at far-infrared wavelengths. These measurements have been combined with the previous measurements of the lambda-doubling intervals of the molecule [J. Chem. Phys. 85 (1986) 1276 ] to determine an improved set of molecular parameters for 13CH. The analysis provides accurate predictions of the transition frequencies between the low-lying spin-rotational levels of the radical at zero magnetic field. A comparison is made with the values of the corresponding parameters of 12CH which reveals small effects due to the breakdown of the Born–Oppenheimer approximation.
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