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测定了卤化氢(HCl,HBr和HI)(2+1)共振增强多光子电离(REMPI)光谱,采用模拟计算法分析推导出转动常数、谱带源以及Ω态振动谱带的同位素位移值.得到的HCl数据同Green等人用常规分析法所推导的结果极为吻合.得出8条振动谱带,其中包括V(1Σ+)态,E(1Σ+)的v′=4态以及HBr的5个新谱带,此外还推导出HI的E态v′=1的4个振动谱带光谱参数.观测了V和E态之间因同类相互作用而产生的不规则能级间距、转动参数和同位素位移.讨论了HCl和HBr的E态和V态振动谱带中的转动谱线序列O和S对Q的强度比的变化,提出了双光子激发机理.
The resonance enhanced multiphoton ionization (REMPI) spectrum of hydrogen halide (HCl, HBr and HI) (2 + 1) was measured and the rotational displacement constants, band sources and the vibrational bands of Ω state were deduced by simulation. The resulting HCl data is in good agreement with the results of Green et al., Using conventional analytical techniques, resulting in eight vibrational bands including the V (1Σ +) state, the v ’= 4 state of E (1Σ +), and the HBr Five new bands and the spectral parameters of four vibrational bands in the E state v ’= 1 of HI were also deduced.The irregular energy levels between the V and E states due to the same kind of interaction were observed, and the rotation parameters And isotopic displacements were discussed.Changes in the intensity ratio of rotational spectral lines O and S to Q in the E and V vibrational bands of HCl and HBr were discussed and a two-photon excitation mechanism was proposed.