甲基氟苯—氩复合物的分子间振动

The Intermolecular Vibration in Fluorotoluene- argon Complexes

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间的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.

Resonant multi - photon ionization spectra of three fluorotoluene - argon complexes through the S-1<--S-0 transition are observed, using resonant multi - photon ionization, together with time - of - flight 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 rotaton of the methyl group.