Vibrational spectra of halobenzene cations in the ground and B̃ 2B2 electronic states obtained by one-photon mass-analyzed threshold ionization spectrometry
Vibrational spectra of halobenzene cations in the ground and B̃ 2B2 electronic states obtained by one-photon mass-analyzed threshold ionization spectrometry
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DOI：
10.1063/1.1478695
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发表时间：
2002-05
影响因子：
4.4
通讯作者：
C. H. Kwon;Hong-Lae Kim;M. Kim
中科院分区：
文献类型：
--
作者：
C. H. Kwon;Hong-Lae Kim;M. Kim
用真空紫外光单光子激发的质量分析阈值电离（MATI）测量了氟、氯、溴和碘苯阳离子的基电子态X 2B1和氯、溴苯阳离子的激发态B 2B2的振动谱。光谱主要由强0-0波段和基本波段、泛音和完全对称a1模的组合组成。特别地，观察到的B态的振动带是通过参考离子基态和中性分子的分配来分配的。根据MATI光谱，氟、氯、溴和碘苯到离子基态的电离能分别为74 229±5、73 177±5、72 570±5和70 638±5 cm−1。氯苯和溴苯的B态电离能分别为91 404±5和85 822±5 cm−1。
Vibrational spectra in the ground electronic states, X 2B1, of fluoro-, chloro-, bromo-, and iodobenzene cations and in the excited electronic states, B 2B2, of chloro- and bromobenzene cations have been measured by mass-analyzed threshold ionization (MATI) via one-photon excitation with vacuum ultraviolet light. The spectra consist mostly of strong 0–0 bands and fundamentals, overtones, and combinations of totally symmetric a1 modes. In particular, the observed vibrational bands in the B states have been assigned by referring to the assignments for the ionic ground states and those for the neutral molecules. From the MATI spectra, the ionization energies of fluoro-, chloro-, bromo-, and iodobenzene to the ionic ground states have been determined to be 74 229±5, 73 177±5, 72 570±5, and 70 638±5 cm−1, respectively. The ionization energies to the B states have also been determined to be 91 404±5 and 85 822±5 cm−1 for chloro- and bromobenzene, respectively.