物理化学学报 >> 1985, Vol. 1 >> Issue (05): 448-454.doi: 10.3866/PKU.WHXB19850508

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CF3I在强红外场下的多光子解离

谢匡吉; 李长林   

  1. 复旦大学物理二系激光化学研究室
  • 收稿日期:1984-12-20 修回日期:1985-05-27 发布日期:1985-10-15

CF3I MULTIPHOTON DISSOCIATION UNDER THE INTENSE IR FIELD

Xie Kuangji; Li Changlin   

  1. Laser Chemistry Lab., Nuclear Science Department, Fudan University
  • Received:1984-12-20 Revised:1985-05-27 Published:1985-10-15

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摘要： 本文用TEA CO_2激光9.6R(14)支作激发光源, 富里叶变换红外光谱仪作分析手段, NO, O_2作CF_3自由基的捕捉剂, 研究了CF_3I红外多光子解离的动力学。
实验发现, O_2和NO均可用来捕捉CF_3I的红外光解产物CF_3自由基。从对CF_3I的红外多光子解离率与外加气体压力的变化关系的研究, 以及CF_3I红外多光子吸收的测量, 揭示出该分子在受红外激光激发时, 具有小分子的特性。同时也观察到外加气体对早期瓶颈效应的消除。在无碰撞及早期瓶颈效应可忽略状态下, 用能量间隔主方程对多光子解离率与激光能量密度的变化关系作了拟合, 得出了与实验比较一致的结果。

Abstract: Using TEA CO_2 laser 9.6R (14) line as excitation source, Fourier transforma tion IR spectrometer as measuring instrument, NO and O_2 as scavenger of CF_3 ra dical, we have studied the dynamics of multiphotoa dissociation of CF_3I.
It was found that O_2 and NO can both be used to trap the CF_3 radical resul ted from IR multiphoton dissociation of CF_3I. From the investigation of the de pendence of the IR MPD yield of CF_3I and the buffer gas pressure and from the measurement of multiphoton absorption of CF_3I, small molecule character was found for CF_3I when it was excited by IR laser. It was observed that buffer gases can reduce the early bottleneck effect. An energy grained master equation was used to simulate the dependence of MPD yield of CF_3I and laser fluence under collisionless and early bottleneck effect neglectable condition. The calculated value is in agreement with the experimental data.