Microwave spectrum of methylene fluoride in excited vibrational states |
| |
Authors: | Eizi Hirota |
| |
Institution: | 1. Department of Chemistry, Faculty of Science, Kyushu University, Fukuoka 812, Japan;2. Institute for Molecular Science, Okazaki 444, Japan |
| |
Abstract: | The rotational spectra of 12CH2F2 in seven of the nine fundamental vibrational states and also in overtone and combination states involving the ν4 mode were observed and assigned. Coriolis interactions between ν3 and ν7, ν2 and ν8, ν3 and ν9, and ν5 and ν7 were analyzed by using approximate expressions for the rotational levels. An effective Hamiltonian with the Coriolis term in the off-diagonal block was applied to stronger interaction between ν3 and ν9. Fermi resonance between ν3 and 2ν4 was found to be negligible. The ground state spectra of 12CH2F2 and of 13CH2F2 were remeasured to improve the accuracy of the rotational and centrifugal distortion constants. The Coriolis coupling constants and the energy differences between two vibrational levels in resonance, which were obtained through an analysis of the satellite spectra, are compared with the results derived from a normal coordinate analysis. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|