The rotational spectrum of HCNO in excited bending combination states
Abstract
Millimeter wave rotational transitions of HCNO have been measured and assigned for 25 different sublevels in the vibrational states v1v2v3v4v5 = 00004, 00012, 00013, 00021, 00022, and 00101. The measurements extend to 252 GHz covering J values up to J = 11 ← 10. Accurate effective constants Beff and Deff were obtained for all of these levels. Each state was treated separately, because of the quasilinearity of the ν5 mode, and the lines were analyzed in terms of an effective Hamiltonian for linear molecules. Several Coriolis-type resonances between levels with adjacent l values were found. One set of resonances, analogous to that found earlier for lower levels, could be analyzed. Fits to the effective Hamiltonian were unsatisfactory in reproducing some of the measured frequencies, indicating resonances which were not analyzed, but the constants obtained show the trend in the parameters of the effective Hamiltonian as a function of bending excitation.
- Publication:
-
Journal of Molecular Spectroscopy
- Pub Date:
- December 1987
- DOI:
- 10.1016/0022-2852(87)90250-5
- Bibcode:
- 1987JMoSp.126..460W