Raman紫外双共振研究C_2H_2分子的碰撞转动弛豫

A STUDY ON ROTATIONAL RELAXATION OF GAS PHASE C_2H_2 BY RAMAN UV OPTICAL DOUBLE RESONANCE

本文利用受激Raman抽运,选择性地制备了C_2H_2分子电子基态的红外非激活振动能级的单一转动态(X^1∑^+,v″=1,J″=9,11,13),并从紫外激光诱导的A^1Au(v′=1)←X^1∑^+(v″=1)荧光谱,直接测定上述三个转动态的C_2H_2—C_2H_2碰撞的消激活速率常数,它们分别为(7.96±1.04)×10^(-10),(8.79±0.97)×10^(-10),(8.76±0.88)×10^(-10)cm^3^(-1),以及由这些初始转动态向其它不同转动态(v′=1,J′=1,3,5,7,9,11,13,15)多量子跃迁转移的激活速率常数。

In the present work, the selective preparation of C2H2 in discrete rotational states of the infrared inactive vibrational v mode in its electronic ground state (X 1∑g+,v211 -1,J' = 9,11 and 13) is achieved by stimulated Raman excitation. From the UV laser induced fluorescence, A1Au(v3''=←X'∑g+ (v2''=1), the C2H2-C2H2 collisional R-R deactivation rate constants are measured. They are (7.96±1.04)X 10-10 cm3s-l for J'' = 9, (8.79±0.97)×l0-10 cm3s-1 for J''= 11 and (8.76±0.88)× 10-10cm3s-1 for J' = 13. The multiquanta R-R energy transfer rcte constants for trdnsitions from the initial pumped level to other different rotational states (v2'= 1, J' = 1,3,5,7,9,11,13,15) have been extracted directly.