title: State-resolved collisional relaxation of highly vibrationally excited CsH by CO2.
abstract: Quenching of highly vibrationally excited CsH(X(1)Σ(+), v=15-23) by collisions with CO2 was investigated. A significant fraction of the initial population of highly vibrationally excited CsH(v=22) was relaxed to a low vibrational level (Δv=-5). The near-resonant 5-1 vibration-to-vibration (V-V) energy was efficiently exchanged. The rate constants for the rotational levels of CO2(00(0)0) [J=36-60] and CO2(00(0)1) [J=5-31] from the collisions with excited CsH were determined. The experiments revealed that the collisions resulting in CO2(00(0)0) were accompanied by substantial excitation in rotation and translation. The vibrationally excited CO2(00(0)1) state exhibited rotational and translational energy distributions near those of the initial state. The total quenching rates relative to the probed state of excited CsH were determined for both CO2 states. The corresponding data indicated that the gains in the rotational and translational energies in CO2 were sensitive to the collisional depletion of excited CsH.
authors.affiliation: School of Science, Xi'an Jiaotong University, Xi'an 710049, China; Department of Physics, Xinjiang University, Urumqi 830046, China. Electronic address: mbxmbb@xju.edu.cn.
authors.forename: Baoxia
authors.initials: B
authors.lastname: Mu
authors.affiliation: Department of Physics, Xinjiang University, Urumqi 830046, China.
authors.forename: Xiuhua
authors.initials: X
authors.lastname: Cui
authors.affiliation: Department of Physics, Xinjiang University, Urumqi 830046, China. Electronic address: shenyifan01@sina.com.
authors.forename: Yifan
authors.initials: Y
authors.lastname: Shen
authors.affiliation: Department of Physics, Xinjiang University, Urumqi 830046, China.
authors.forename: Kang
authors.initials: K
authors.lastname: Dai
keywords: CO(2); Collisional energy transfer; DSHR pumping; Excited CsH; Rate constant; Stimulated emission measurement