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采用光腔衰荡光谱(cavity ringdown spectroscopy,CRDS)技术在19870～20250cm-1能量范围内研究了AsH2自由基A2A1(000)-X2B1(000)带的高灵敏高分辨吸收光谱.AsH2自由基由AsH3/Ar混合气脉冲直流放电产生.通过对Ka′≤5,N′≤10的777根谱线进行了转动标识和最小二乘拟合,获得了精确的激发态光谱常数和转动项值.其中转动项值和部分高阶光谱常数均为首次得到.通过分析发现部分Ka′≤4的转动能级和全部Ka′≤5的能级受到了扰动,扰动很可能来自于基态的高振动激发态.
The high sensitivity and high resolution absorption spectrum of AsH2 radical A2A1 (000) -X2B1 (000) band was studied by cavity ringdown spectroscopy (CRDS) at the energy range of 19870 to 20250cm-1. AsH2 radical AsH3 / Ar pulsed DC discharge was generated.According to the rotation identification and least square fitting of 777 lines with Ka’≤5, N’≤10, the exact excited-state spectral constants and rotation terms were obtained. The first rotation term and part of the higher order spectral constants are obtained for the first time.It is found through analysis that some of the rotational energy levels of Ka’≤4 and all the energy levels of Ka’≤5 are perturbed and the perturbations are likely to come from the high vibrational excitation state.