6533b824fe1ef96bd12815f6
RESEARCH PRODUCT
Measurement of rotational relaxation in the ground state of methane perturbed by argon at low temperature
D.v. KalininTony GabardYu. G. SelivanovD. K. BronnikovJean-paul ChampionJ.c. Hilicosubject
Jet (fluid)RadiationMaterials scienceArgon010304 chemical physicsAbsorption spectroscopychemistry.chemical_elementRotational temperature010402 general chemistry01 natural sciencesAtomic and Molecular Physics and OpticsMethane0104 chemical sciencesRotational energychemistry.chemical_compoundchemistry0103 physical sciencesRelaxation (physics)Atomic physicsGround stateSpectroscopydescription
International audience; Relaxation processes at low temperature in methane perturbed by argon have been investigated on the basis of new measurements. Diode laser absorption spectra of methane in the region of the dyad nu2/nu4 in supersonic expansions have been recorded. The time of relaxation of the ground state mean rotational energy was derived from the observed dependences of the rotational temperature on the concentration in the jet. A semi-classical model was used to calculate the state-to-state relaxation rate constants at room temperature. The evaluation of the time of relaxation of the mean rotational energy using semi-empirical temperature dependence laws is presented and discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-05-01 |