| 光腔衰荡光谱技术研究AsH2自由基:Ã2A1(000)−X~2B1(000) |
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| 引用本文： | 赵东锋,秦成兵,张群,陈旸.光腔衰荡光谱技术研究AsH2自由基:Ã2A1(000)−X~2B1(000)[J].科学通报,2009,54(20):3190-3197. |
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| 作者姓名： | 赵东锋 秦成兵 张群 陈旸 |
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| 基金项目： | 国家自然科学基金(批准号: 20673107)、国家重点基础研究发展计划(编号: 2007CB815203)和中国科学院知识创新工程重要方向项目(批准号: KJCX2-SW- H08)资助 |
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| 摘 要： | 采用光腔衰荡光谱(cavity ringdown spectroscopy, CRDS)技术在19870~20250 cm−1能量范围内研究了AsH2自由基 Ã2A1(000)−X~2B1(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K′a≤ 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K′a≤ 4的转动能级和全部K′a≤ 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.
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| 关 键 词： | AsH2自由基 脉冲直流放电 光腔衰荡光谱 |
| 收稿时间： | 2009-04-17 |
Cavity ringdown spectroscopy of AsH2 radical: Ã2A1 (000)–X 2B1(000) |
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| DIAO Dong-Feng,QIN Cheng-Bing,ZHANG Qun,CHEN Yang.Cavity ringdown spectroscopy of AsH2 radical: Ã2A1 (000)–X 2B1(000)[J].Chinese Science Bulletin,2009,54(20):3190-3197. |
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| Authors: | DIAO Dong-Feng QIN Cheng-Bing ZHANG Qun CHEN Yang |
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| Institution: | Hefei National Laboratory for Physical Sciences, Microscale and Department of Chemical Physics, University of Sci-ence and Technology of China, Hefei 230026, China |
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| Abstract: | The absorption spectra of AsH2 radical were recorded in 19870―20250 cm−1 by cavity ringdown spectroscopy. The AsH2 radicals were produced by pulsed DC discharge of a gas mixture of AsH3 in argon. Based on the previous studies, the obtained spectra can be assigned as the vibronic transition: Ã2A1 (000)–X 2B1(000). Rotational assignments and least square fittings for about 777 rotational lines with Ka´≤5 and N´≤10 were carried out, and the rotational term values and the molecular parameters were also determined with reasonably high precision. The perturbations observed for the upper state were briefly analyzed and discussed. |
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| Keywords: | AsH2 radical pulsed DC discharge cavity ringdown spectroscopy (CRDS) |
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