二氧化碳对高振动态激发的CsH的态分辨碰撞弛豫

State-resolved collisional relaxation of highly vibrationally excited CsH by CO2.

作者信息

Mu Baoxia, Cui Xiuhua, Shen Yifan, Dai Kang

机构信息

School of Science, Xi'an Jiaotong University, Xi'an 710049, China; Department of Physics, Xinjiang University, Urumqi 830046, China.

Department of Physics, Xinjiang University, Urumqi 830046, China.

出版信息

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Sep 5;148:299-310. doi: 10.1016/j.saa.2015.03.046. Epub 2015 Apr 9.

DOI:10.1016/j.saa.2015.03.046

PMID:25909904

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.

摘要

研究了高振动态激发的CsH（X(1)Σ(+)，v = 15 - 23）与CO2碰撞时的猝灭过程。高振动态激发的CsH（v = 22）初始布居的很大一部分弛豫到了低振动态（Δv = -5）。近共振的5 - 1振动 - 振动（V - V）能量得到了有效交换。测定了与激发态CsH碰撞时CO2（00(0)0）[J = 36 - 60]和CO2（00(0)1）[J = 5 - 31]转动能级的速率常数。实验表明，导致CO2（00(0)0）的碰撞伴随着转动和平动的显著激发。振动态激发的CO2（00(0)1）态的转动和平动能分布与初始态相近。针对两种CO2态，测定了相对于探测到的激发态CsH的总猝灭速率。相应数据表明，CO2中转动和平动能的增加对激发态CsH的碰撞消耗很敏感。