6533b835fe1ef96bd129f1be
RESEARCH PRODUCT
Collisional Broadening, Line Shifting, and Line Mixing in the Stimulated Raman 2-v2 Q-Branch of CH4
G. Millot B. Lavorel J. I. Steinfeldsubject
DOUBLE-RESONANCETUNABLE DIODE-LASERVIBRATIONAL POLYADSSPECTROSCOPYMETHANE LINESTHEORETICAL-ANALYSISINFRAREDROTATIONAL ENERGY-TRANSFERTETRAHEDRAL MOLECULESPhysics::Atomic PhysicsRATESINELASTICLOW-TEMPERATURESdescription
0021-9606; Self-, argon-, and helium-broadening coefficients have been measured for 13 lines in the 2v2 Raman Q branch of CH4 using stimulated inverse Raman spectroscopy. The linewidths clearly show the symmetry-state dependence characteristic of pressure broadening, and inelastic processes in general, involving spherical-top molecules. Pressure-induced line shifts have also been measured for these features in pure methane. The pressure-shift coefficients do not display the symmetry-state dependence found for the linewidths. By applying the Rosenkranz perturbation treatment to a pair of collisionally mixed lines, we have been able to obtain an estimate of individual state-to-state contributions to the overall linewidth.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1991-01-01 |