State-to-state and total rotational energy transfer rate constants for N(B~2#SIGMA#~+, v=0,N)+H_2, CN(X~2#SIGMA#~+,v=2,N)+H_2, D_2, and CN(X~2#SIGMA#~+,v=3,N)+NO

摘要

State-to-state and total rotational energy transfer (RET) rate constants were measured for collisions of CN(B~2#SIGMA#~+,v=0,N_i=4,7,8,11) with H_2, CN(X~2#SIGMA#,v=2,N_i=4,11) with H_2 and D_2, and CN(X~2#SIGMA#,v=3,N_i=4) with NO at room temperature and under single, or near-single, collision conditions. Rate constants were also measured for electronic quenching of CN(B~2#SIGMA#~+,v=0,N_i=4,7,8, and 11) by H_2. In general, state-to-state RET rate constants showed very small or no even-odd alternations as the final rotational state varied. Total rate constants for CN(X~2#SIGMA#~+,v=2,N)/H_2, D_2 were found to decrease with increasing rotational quantum number, N. By contrast, total rate constants for CN(B~2#SIGMA#~+,v=0,N)/H_2 were found to be relatively independent of N. Exponential energy gap and angular momentum fitting functions were found to represent measured state-to-state RET rate constants very well and were substantially equally effective in this regard.