Using The CARS Detection Technique To Investigate The Collisional Energy Transfer Between Li₂,K₂ By H₂

This paper mainly based on coherent anti stokes Raman spectroscopy (CARS) detection technique to study the K2 1¹âˆ‘_u⁺ (V = 46-61) and H2 vibration between the level of the electronic - turning collision transfer; Then reuse coherent anti stokes Raman spectroscopy (CARS) analyzes the H2 and Li2 (A¹âˆ‘_u⁺) of the collision of the vibration modal cloth r distribution turn.(1) Using the CARS(Coherent Anti-stokes Raman Spectroscopy) detection technique, the electronic-to-rovibrational levels energy transfer between electronically excited K₂ and H₂ has been investigated. The scanned CARS spectra reveal that during energy transfer processes H₂ molecules are produced only at the V=1, J=2 and V=2, J=0,1,2 rovibrational levels. From scanned CARS spectral pesks the populational ratios are obtained. The n₁/n₄, n₂/n₄,and n₃/n₄ are 3.3±0.5, 2.2±0.3 and 2.0±0.3, respectively, where n₁,n₂,n₃ and n₄ represent the number densities of H₂ at rovibrational levels (2,0),(2,1),(2,2) and (1,2) respectively.The population ratios indicate that the H₂ molecules produced by the energy transfer process are 88% populated at the V=2 level and 12% at V=1.The ralative fractions (v>,r>,t>) of average energy disposal are derived as (0.53,0.01,0.46),having major vibrational and translational energy release. Through simple kinetic model at the experimental conditions of T=573K and 5×10³Pa, collisional transfer rate coefficients k₁₂=(3.3±0.7)×10^-14 and k₂=(1.4±0.3)×10^-14cm³s^-1 have been obtained.(2)Coherent anti-Stokes Raman Spectroscopy (CARS) has been used to analyze the vibrotational state distribution of H₂ after energy transfer with Li₂(A¹âˆ‘_u⁺) . The scanned CARS spectra reveal that during energy transfer processes H₂ molecules are produced at the V=1,2 and 3 vibrational levels. From scanned CARS spectral peaks two possible population ratios are obtained. Through shape simulations of the time resolved CARS profiles under a kineti model, the actual population ratios are determined. The H₂ molecules produced by the energy transfer process are 0.48 populated at the V=1 level, 0.36 at V=2 and 0.16 at V=3. The relative fractions (t>,vib>,r>) of average energy disposal are derived as (0.50,0.47,0.03), having major vibrational and translational energy release. This consequence supports a collinear collision geometry in Li₂—H₂ energy transfer.