Variationally exact ro-vibrational levels of the floppy CH2+ molecule

Ro-vibrational calculations are performed on the CH₂⁺ radical using a method recently developed for atom-diatom systems. The vibrational fundamentals obtained are 2998.8, 718.3, and 3270.7 cm^?1, in good agreement with recent results. Band origins for several higher vibrational levels are also obtained. Calculations with J = 1 show that the Coriolis interaction play a significant role and two alternative embeddings are discussed. Use of correlation parameters confirms that CH₂⁺ belongs to no idealized class of molecules in keeping with its “floppy” nature.