High Revolution Raman UV Optical Resonance Spectra and the State-to-State Rotational Energy Transfer Rates Study of C₂H₂(\widetildeX¹Σ_g⁺,v₂"=1)

Using high resolution Raman UV optical resonance spectra of C₂H₂(\widetildeX¹Σ_g⁺,v″₂=1), the rotation-vibration Raman shifts in the Q(3) and Q(5) branchs of the v″₂ band have been achieved for the first time. They are (1974.252±0.019)cm^-1 for Q(3), (1974.127±0.008)cm^-1 for Q(5). Under C₂H₂/C₂H₂ lower collision number Z experimental condition, the R-R deactivation rate constants for (v″₂=1, J″=3、5、9、11、13) and the multiquanta R-R energy transfer activation rate constants from the initial pumped levels to other different rotational states (v″₂=1, J″=1、3、5……15) have been extracted. The computer simulation of the experimental data has been achieved by rate constant matrix model and the simulation is in good accord with the experimental result.