物理化学学报 >> 2013, Vol. 29 >> Issue (09): 1886-1890.doi: 10.3866/PKU.WHXB201306191

热力学,动力学和结构化学 上一篇    下一篇

氦液滴中羰基硫分子的光解动力学

张翠梅1,2, 张志国1,2, 黄存顺2, 张群1, 陈旸1   

  1. 1 中国科学技术大学合肥微尺度物质科学国家实验室, 化学物理系, 合肥 230026;
    2 中国科学院大连化学物理研究所, 分子反应动力学国家重点实验室, 辽宁 大连 116023
  • 收稿日期:2013-05-03 修回日期:2013-06-19 发布日期:2013-08-28
  • 通讯作者: 黄存顺, 张群, 陈旸 E-mail:cshuang@dicp.ac.cn;qunzh@ustc.edu.cn;yangchen@ustc.edu.cn
  • 基金资助:

    国家自然科学基金项目(21073187, 21273212, 21173205);国家重点基础研究项目(973)(2010CB923302);中国科学院百人计划和中国科学院知识创新项目;中国科学技术大学-同步辐射联合基金(KY2340000021)资助

Photodissociation Dynamics of Carbonyl Sulfide in Helium Droplets

ZHANG Cui-Mei1,2, ZHANG Zhi-Guo1,2, HUANG Cun-Shun2, ZHANG Qun1, CHEN Yang1   

  1. 1 Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China;
    2 State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning Province, P. R. China
  • Received:2013-05-03 Revised:2013-06-19 Published:2013-08-28
  • Contact: HUANG Cun-Shun, ZHANG Qun, CHEN Yang E-mail:cshuang@dicp.ac.cn;qunzh@ustc.edu.cn;yangchen@ustc.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21073187, 21273212, 21173205), National Key Basic Research Programof China (973) (2010CB923302), 100 Talents Programof Chinese Academy of Sciences, Knowledge Innovation Programof Chinese Academy of Sciences, and USTC-NSRL Joint Funds, China (KY2340000021).

摘要:

用时间切片速度成像方法研究了氦液滴中羰基硫(COS)分子的光解动力学. 从共振增强(2+1)电离的CO光谱中发现在氦液滴环境中解离产物CO的转动冷却比振动冷却更有效.利用速度成像采集到的CO (v=0)和CO (v=1)的影像在角分布上都呈现出各向同性的特点. 产物平动能分布的结果表明尽管大部分的平动能都被超流体环境所弛豫, 但振动激发态产物CO (v=1) 的平均平动能比振动基态产物CO (v=0) 的平均平动能高.对羰基硫分子在氦液滴中的光解动力学机理进行了讨论.

关键词: 氦液滴, 时间切片速度成像, 羰基硫

Abstract:

The photodissociation dynamics of carbonyl sulfide (OCS) in helium droplets was studied using a velocity-map-imaging technique. The CO fragments were detected by (2+1)-resonance-enhanced multiphoton ionization. It was found that in the helium droplet environment, rotational cooling is much more efficient than vibrational cooling. The velocity map images for both CO (v=0) and CO (v=1) exhibit nearly isotropic angular distributions. The kinetic energy distributions show that most of the translational energies are relaxed in the finite-sized superfluid helium system. However, the average translational energies of the CO (v=1) images are higher than those of the CO (v=0) images. The relevant mechanism is briefly discussed.

Key words: Heliumdroplet, Time-sliced ion imaging, OCS

MSC2000: 

  • O643