激发态H2(X1∑+g,v=1,J=1)之间的碰撞能量合并

受激拉曼激发H2(0,1)基态的Q支得到H2(1,1)能级.在室温条件下,利用反斯托克斯拉曼散射(CARS)探测技术测量了碰撞能量合并(EP)过程H2(1,1)+H2(1,1)→H2(2,J)+H2(0,J″)及H2(1,1)与H2(1,J)转动能级间的碰撞转移速率系数.扫描CARS谱表明在H2(1,1)能级的碰撞能量...

Energy Pooling collisions between Excited H2（X1∑g+,v=1,J=1）

Vibrational level of H2(v=1,J=1) was populated by stimulated Raman excitation of the Q branch line.The rate coefficients for the energy pooling(EP) collision H2(1,1)+H2(1,1)→H2(2,J)+H2(0,J″) and rotational energy transfer between H2(1,1) and H2(1,J) at room temperature have been measured using the Coherent Anti-Stokes Raman Scattering(CARS)technique.The scanned CARS spectra reveal that during energy transfer process H2 molecules are produced only at the(2,1),(1,0) and(1,2) vibrational levels.The semilog plot of the time resolved CARS intensity for the H2(2,1) level yields collisional deactivation rate(2.8±0.5)×105 s-1.n1,n2,n3 and n4 represent the number densities of H2 at the levels(1,1),(2,1),(1,0) and(1,2) respectively.Through shape simulation of the time resolved CARS profiles of H2(1,1) under a kinetic model,the actual population n1/n2 is unambiguously determined to be of 4.2.From scanned CARS spectral peaks n3/n2=1.2 and n4/n2=1.0 are obtained.The H2 molecules produced by energy transfer process are 0.31 populated at the v=2 ande 0.69 at v=1.The rate coefficient for the energy pooling collision is estimated to be(7.5±1.4)×10-14 cm3 s-1.Relevance to another experiment is discussed.