范德瓦尔斯分子p-C_6H_4FCH_3...Ar外部振动的共振双光子电离光谱

Resonant Two-Photon Ionization Spectra of External Vibrations of the van der Waals Complex p C_6H_4FCH_3...Ar

利用单色共振双光子电离光谱技术研究了ｐ－Ｃ６Ｈ４ＦＣＨ３与Ａｒ形成的范德瓦尔斯分子ｐ－Ｃ６Ｈ４ＦＣＨ３．．．Ａｒ电子态跃迁（Ｓ１←Ｓ０）Ｏ００带附近的光谱，观察到了许多谱带。分析表明，这些谱带，除来自于甲基ＣＨ３内转动跃迁外，都可以归属为Ａｒ相对于ｐ－Ｃ６Ｈ４ＦＣＨ３的振动跃迁。在用三维谐振子波函数线性组合作为基和伦纳德－琼斯作用势的基础上，借助量子力学方法计算了ｐ－Ｃ６Ｈ４ＦＣＨ３．．．Ａｒ分子中范德瓦尔斯振动的能级，计算结果支持了光谱的归属。

Resonant two photon ionization spectrum of p C_6H_4FCH_3...Ar through the S 1←S 0 transition revealed a number of bands near the origin  0 0 band, and all these bands except for thoes due to the internal rotational transitions of the CH 3 group are assigned to the low frequency external vibrations. Quantum calculations using the method of linear combination of three dimensional harmonic osillator products were carried out to assist the spectral assignments.