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分子光谱中的微扰现象是复杂而又重要的,目前从实验上研究它们仍十分困难。我们用四种不同的激光激发荧光(L1F)光谱法研究了CaOH A~2π—X~2Σ跃迁在16530—16730cm~(-1)区域内重迭且存在Fermi共振的△V_1=1和△V_2=2谱带,得出了它们的初步归属。结果表明,综合使用这四种LlF光谱方法对于分析较复杂的重迭和微扰谱带是十分有效的,而且荧光“差频”法还可以作为鉴别微扰能级的新实验方法。
Perturbations in molecular spectroscopy are complex and important, and it is still difficult to study them experimentally. We used four different laser excitation fluorescence (L1F) spectroscopy to study the effects of Fermi resonance △ V_1 = 1 and △ V_2 on the overlap of CaOH A ~ 2π-X ~ 2Σ transitions in the range of 16530-16730 cm ~ (-1) = 2 bands, come to their initial attribution. The results show that the combined use of these four LlF spectral methods is very effective for the analysis of more complex overlapping and perturbation bands, and the fluorescence “difference frequency” method can also be used as a new experimental method to identify the perturbation level.