化学学报 ›› 2001, Vol. 59 ›› Issue (8): 1241-1245. 上一篇    下一篇

研究论文

甲基氟苯-氩复合物的分子间振动

胡义华;刘美希;陈丽;王小涓;陆文云;杨世和   

  1. 广东工业大学应用物理系;香港科技大学化学系
  • 发布日期:2001-08-15

The intermolecular vibration in fluorotoluene-argon complexes

Hu Yihua;Liu Meixi;Chen Li;Wang Xiaojuan;Lu Wenyun;Yang Shihe   

  • Published:2001-08-15

在超声分子束装置上,利用多光子共振光电离和飞行时间质谱技术,观测到了三种甲基氟苯-氩复合物S1←S0电子态跃迁的两光子共振电离光谱。通过对光谱的分析和理论计算,获得了三种复合物内部分子音质伸缩振动和弯曲振动的频率。结果显示,F原子和CH3在苯环上取代H原子后,它们的相对位置对伸缩振影响很小,而与弯曲振动有较大的相关。另外,在复合物内部,Ar原子对甲基氟苯中的CH3内转动有明显的阻碍作用。

关键词: 甲基氟苯, 氩, 苯P, 分子间振动, 共振电离光谱, 光电离, 范德华复合物, 分子振动

Resonant multi-photon ionization spectra of three fluorotoluene- argon complexes through the S1←S0 transition are observed, using resonant multi-photon ionization, together with time-of-0flight mass spectrometry, in supersonic molecular beam. By the spectra analysis and theory calculation, the stretching vibrational frequencies and two bending vibrational frequencies of the three complexes are obtained. The results show after F atom and methyl group CH3 substitute H atom in benzene ring, their relative position has very little influence on the stretch vibration of the complexes, but strong effect on bending vibration. In addition in the complexes, Ar atom has apparent obstruction to the internal rotation of the methyl group.

Key words: ARGON, BENZENE P, PHOTOIONIZATION, MOLECULAR VIBRATION

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