高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (4): 599.

• 论文 • 上一篇    下一篇

1064nm激光诱导Ge(111)与Cl2反应动力学

张抗战, 秦启宗   

  1. 复旦大学激光化学研究所, 上海, 200433
  • 收稿日期:1994-06-11 修回日期:1994-11-10 出版日期:1995-04-24 发布日期:1995-04-24
  • 通讯作者: 秦启宗
  • 作者简介:张抗战,男,30岁,博士研究生.
  • 基金资助:

    国家科学技术委员会攀登计划项目

Kinetics of Laser-Induced Reaction of Ge(111) With Cl2Under Laser Irradiation at 1064nm

ZHANG Kang-Zhan, QIN Qi-Zong   

  1. Laser Chemistry Institute, Fudan University, Shanghai, 200433
  • Received:1994-06-11 Revised:1994-11-10 Online:1995-04-24 Published:1995-04-24

摘要: 采用超声分子束和时间分辨质谱技术研究了1064nm脉冲激光辐照下Ge(111)与Cl2的反应动力学。实验结果表明,该反应的主要产物为GeCl2,提高入射氯分子的平动能将增加反应速率。激光能量密度对GeCl2产率呈指数关系,而对GeCl2的平动温度影响不大。升高Ge(111)表面温度也能提高反应产率。同时还讨论了近红外激光诱导GeCl2反应的机理。

关键词: 激光诱导反应, 锗(111)表面, 分子束, 反应动力学

Abstract: Laser-induced gas-surface reaction of Ge(111)surface with chlorine is investigated by a CW supersonic molecular beam under a pulsed laser irradiation at 1064 nm.Amajor desorbed reaction product GeCl2is determined at different surface temperatures by a timeresolved mass spectrometry.The reaction yield of GeCl2increases obviously with increasing the translational energy of the incident chlorine molecules,laser fluence and surface temperature. But the translational temperature of GeCl2measured by time-of-flight spectra are independent of incident Cl2tanslational energy and laser fluence. Apossible reaction mechanism for the laser-induced reaction of Ge(111)with Cl2at 1064 nm mainly consists of the dissociative chemisorption of Cl2on the surface,the reaction of absorbed Cl with Ge atoms and the laser-induced thermal desorption.

Key words: Laser-induced reaction, Ge(111)surface, Molecular beam, Reaction kinetics

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