Study of Renner--Teller, spin--orbit, and Fermi-resonance interactions in tilde X sup 2. Pi. ( v sub 1 v2 0) levels of NCO by stimulated emission pumping spectroscopy
- Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973 (United States)
We report extensive measurements of rovibronic levels in the 020/100 and 040/120/200 Fermi-resonant polyads of NCO. The levels were accessed by the technique of stimulated emission pumping spectroscopy in a supersonic free jet expansion following excitation of bands in the {ital {tilde A}} {sup 2}{Sigma}{sup +}{minus}{ital {tilde X}} {sup 2}{Pi} spectrum of the radical. The data were analyzed in terms of an effective Hamiltonian which explicitly included reference to all the possible vibronic levels of {sup 2}{Pi} symmetry in the polyad under consideration. The effects of levels outside these were treated by perturbation theory. The model was successful in fitting the data close to the experimental measurement precision and the resulting parameters were interpreted in terms of the harmonic and anharmonic vibrational terms. The effective Renner--Teller coupling parameter in NCO varied with vibrational level; however, parameters describing the Fermi-resonance interaction were found to be constant for all the levels investigated.
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 7082443
- Journal Information:
- Journal of Chemical Physics; (United States), Vol. 97:7; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Renner--Teller effect on the highly excited bending levels of {ital {tilde a}} {sup 1}{ital A}{sub 1} CH{sub 2}
The dynamical Renner--Teller effect. III. Rovibronic energy transfer pathways in the NCO([ital [tilde X]] [sup 2][Pi])+He system
Related Subjects
CARBON MONOXIDE
VIBRATIONAL STATES
NITROGEN COMPOUNDS
RADICALS
COMPUTER CODES
COUPLING
EXCIMER LASERS
FERMI RESONANCE
HAMILTONIANS
L-S COUPLING
PERTURBATION THEORY
ROTATIONAL STATES
SYMMETRY BREAKING
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
ENERGY LEVELS
EXCITED STATES
GAS LASERS
INTERMEDIATE COUPLING
LASERS
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
QUANTUM OPERATORS
RESONANCE
664200* - Spectra of Atoms & Molecules & their Interactions with Photons- (1992-)
664400 - Experimentally Derived Information on Atomic & Molecular Properties- (1992-)