Abstract
The v 2 0 + v 6 ±1 and v 5 ∓1 + v 6 ∓1 perpendicular bands of methyl chloride have been studied under high resolution, and found to be coupled by a strong xy Coriolis interaction, with eventual level crossing. Evidence is given for the K numbering of the branches and earlier assignments for v 5 ∓1 + v 6 ∓1 [1] are corrected. Several minor perturbations and unassigned lines remain to be clarified.
Keywords