6533b86efe1ef96bd12cbfeb
RESEARCH PRODUCT
Multispectrum fits for line mixing in the ν3 band Q branch of methane
A.s. PineTony Gabardsubject
[ PHYS.QPHY ] Physics [physics]/Quantum Physics [quant-ph]010504 meteorology & atmospheric sciencesSelf and foreign gas-broadened methane01 natural sciencesMethaneSpectral linelaw.inventionchemistry.chemical_compoundNuclear magnetic resonance[PHYS.QPHY]Physics [physics]/Quantum Physics [quant-ph]law0103 physical sciencesRelaxation matrixPhysical and Theoretical Chemistry010306 general physicsScalingSpectroscopyMixing (physics)0105 earth and related environmental sciencesLine (formation)PhysicsLine mixingLaserAtomic and Molecular Physics and OpticschemistryDicke narrowingLower pressureAtomic physicsdescription
International audience; First-order line-mixing coefficients and model relaxation matrix element scaling factors have been obtained for allowed transitions in the nu3 band Q branch of CH4 broadened by H2, He, N2, O2, Ar, and CH4. The broadening, shifting, Dicke-narrowing, and line-mixing parameters are determined by simultaneous least-squares fitting of spectra at pressures from 0.014 to 66.66 kPa recorded with a high-resolution difference-frequency laser. These results confirm, improve, and extend a previous analysis of the lower pressure (613.3 kPa) data [A.S. Pine, J. Chem. Phys. 97 (1992) 773] which yielded averaged coefficients of individually fit spectra where adjacent broadened lines are still partially resolved.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2003-01-01 | Journal of Molecular Spectroscopy |