物理化学学报 >> 1997, Vol. 13 >> Issue (04): 322-327.doi: 10.3866/PKU.WHXB19970408

研究论文 上一篇    下一篇

van der Waals团簇ArHCl的光电离研究

李玥,王秀岩,张晓光,李连斌,楼南泉,盛六四,张允武   

  1. 中国科学院大连化学物研究所分子反应动力学国家重点实验室,大连 116023|中国科学技术大学国家同步辐射实验室,合肥 230026
  • 收稿日期:1996-09-02 修回日期:1996-11-26 发布日期:1997-04-15
  • 通讯作者: 李玥

The Photoionization Investigations of van der Waals Cluster ArHCl

Li Yue,Wang Xiu-Yan,Zhang Xiao-Guang,Li Lian-Bin,Lou Nan-Quan,Sheng Liu-Si,Zhang Yun-Wu   

  1. State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023|University of Science and Technology of China,National Synchrotron Radiation Laboratory,Hefei 230026
  • Received:1996-09-02 Revised:1996-11-26 Published:1997-04-15

摘要:

用同步辐射光源和光电离质谱研究了分子束中ArHCl van der Waals(vdW)团簇的光电离过程. 测量结果表明,分子束中的ArHCl的浓度与气源压力近似满足如下关系式:a(ArHCl)%=1.79×10-8P01.5. 首次给出了ArHCl团簇的光电高效率曲线,并测得ArHCl+的出现势为12.52±0.03eV. 根据实验测量的HCl和ArHCl的电高能,计算出Ar-HCl+的解离能为0.22±0.03eV. 用Gaussian-94w量化程序计算出解离能约为0.16eV. 实验表明当团簇内的Ar电离时,ArHCl+质谱峰强度明显低于预计的强度,是由于体系电离后发生了电荷转移及解离过程.

关键词: 团簇, 光电离, 同步辐射应用

Abstract:

The photoionization processes of van der Waals (vdW) cluster ArHCl in a molecular beam have been investigated by using synchrotron radiation light source and photoionization mass spectrometer. The results show that the concentration of the ArHCl dimer is approximately given by the equation: α(ArHCl)%=1.79×10-8po1.5. The PIE curve of ArHCl has been given for the first time. The appearance potential of ArHCl+ is determined to be 12.52±0.03eV. Using the IP values of HCl obtained in our experiment, the bond dissociation energy of ArHCl+ is deduced to be 0.22±0.03eV. The theoretical calculations using Gaussian-94w indicate that the value is about 0.16eV. When Ar in the cluster is ionized, the intensity of ArHCl+ is obviously lower than that expected. It indicates that the charge transfer and dissociation processes have taken place in the system.

Key words: Clusters, Synchrotron radiation, Photoionization