On the method and results of calculation of vibrational tetrahedral sub-level energies and resonance interactions in vibrational spectra of high symmetry molecules: CH4 and GeH4

High resolution spectroscopy of asymmetric top molecules in nonsinglet electronic states: the ν3 fundamental of chlorine dioxide (16O35Cl16O) free radical in the X2B1 electronic ground state

“…, ref. 4–15) have been analysed and discussed in detail. Nevertheless, there is a class of polyatomic molecules for which the mentioned strong vibration–rotation theory cannot be directly applied and modifications and improvements of the theory are required.…”