荧光色散谱对FeS(X5△)振动常数的实验确认

基于之前的激光诱导荧光激发谱工作,采用激光诱导荧光色散谱技术直接侦测中性FeS基电子态X5￠振动能级到v″=3而获得其振动常数. 所得FeS(X⁵△)振动频率值(518±5 cm^-1)和最近的光电子能谱测量值(520±30 cm^-1) [J. Phys. Chem. A 107, 2821 (2003)]符合得较好,该光电子能谱测量值是之前唯一报道的FeS电子态振动频率的实验值. 通过比较实验结果和相关文献(主要来自理论预测),确定FeS的基态是X⁵△态.     

荧光色散谱对FeS(X5△)振动常数的实验确认

Based on previous laser-induced fluorescence excitation spectroscopy work, the vibrational constants of neutral FeS in the X⁵△ electronic state were obtained by directly mapping the ground-state vibrational levels up to v″=3 using conventional laser-induced dispersed fluorescence spectroscopy. The vibrational frequency of FeS(X⁵△) (518±5 cm-1) agrees well with that reported in a recent PES measurement (520±30 cm-1) [J. Phys. Chem. A 107, 2821 (2003)] which is the only one prior experimental vibrational frequency value for the ⁵△ state of FeS. Careful comparisons of our experimental results and those documented in the literature (mainly from theoretical predictions) suggest that the ground state of FeS is ⁵△ state.