EFFECTIVE 4TH ORDER TORSION-ROTATION HAMILTONIAN PARAMETERS OF C-13 METHANOL

In this work, the effective fourth order Hamiltonian parameters of C-1 3 substituted methanol were determined using microwave (MW), millimete rvave (MMW) and Fourier transform far-infrared (FIR) assigned transiti ons in the ground and first excited torsional states. The data set con sisted of 1060 transitions with the rotational angular momentum J < 13 (with 416 FIR lines). The data set was fitted with a recently develop ed effective Hamiltonian model to derive the molecular parameters. The results indicate that the model developed for the parent methanol spe cies is valid for the C-13 substituted species also. The results will allow the energy levels of the molecule to be calculated with improved precision which will be of use for the discovery of new FIR laser emi ssion in C-13 methanol and the discovery of this molecular species in interstellar space. (C) 1997 Elsevier Science B.V.