Determination of the Isotope Shift of the 000 Band of the First Singlet-Singlet Electronic Transition of Cl- and Br-Benzene in a Supersonic Beam
Determination of the Isotope Shift of the 000 Band of the First Singlet-Singlet Electronic Transition of Cl- and Br-Benzene in a Supersonic Beam
复制标题
超声束中氯苯和溴苯第一单重态-单重态电子跃迁 000 能带同位素位移的测定
DOI：
10.1006/jmsp.1996.0253
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发表时间：
1996
影响因子：
1.4
通讯作者：
Ortíz
中科院分区：
文献类型：
--
作者：
Cruz;Campos;Ortíz
利用超声束共振增强双光子电离技术，获得了转动温度为1 K时35 Cl-、37 Cl-、79 Br-和81 Br-C_6 H_5第一单重态-单重态电子跃迁的0（0）0带的光电离谱。离子已根据其质量在飞行时间质谱仪中进行了分析。从同时获得的~（35）Cl-和~（37）Cl-C_6 H_5的光谱中，测定了同位素位移为0.14 +/-0.02cm ~（-1）。类似地，从79 Br-和81 Br-C6 H5的光谱中，同位素位移小于0.02 cm-1。通过考虑每个分子的几何结构和对称性对所获得的光谱进行了解释，并获得了与实验结果一致的旋转常数和几何参数的值。
By using resonance-enhanced two-photon ionization in a supersonic beam, photoionization spectra of the 0(0)0 band of the first singlet-singlet electronic transition of 35Cl-, 37Cl-, 79Br-, and 81Br-C6H5 have been obtained at a rotational temperature of 1 K. The ions have been analyzed according to their masses in a time-of-flight mass spectrometer. From the spectra of 35Cl- and 37Cl-C6H5 obtained simultaneously, an isotope shift of 0.14 +/- 0.02 cm-1 has been determined. Similarly, from the spectra of 79Br- and 81Br-C6H5 the isotope shift resulted to be smaller than 0.02 cm-1. The spectra obtained have been interpreted by considering the geometrical structure and symmetry of each molecule, and values for the rotational constants and geometrical parameters in the upper and lower states have been obtained in agreement with the experimental results.