高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (7): 1093.

• 论文 • 上一篇    下一篇

超声射流冷却丁二酮的激光诱导荧光激发谱

裴林森, 陈旸, 金瑾, 高义德, 戴静华, 陈从香   

  1. 中国科学技术大学选键化学开放实验室, 化学物理系, 合肥 230026
  • 收稿日期:1999-06-04 出版日期:2000-07-24 发布日期:2000-07-24
  • 通讯作者: 陈从香(1941年出生),男,教授,从事激光光谱和分子反应动力学研究.
  • 基金资助:

    国家自然科学基金(批准号:29873045);中国科学院院长基金;“九·五”攀登项目基金

Supersonic Jet-cooled Laser-induced Fluorescence(LIF) Spectrum of Biacetyl

PEI Lin-Sen, CHEN Yang, JIN Jin, GAO Yi-De, DAI Jing-Hua, CHEN Cong-Xiang   

  1. Open Laboratory of Band Selective Chemistry, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
  • Received:1999-06-04 Online:2000-07-24 Published:2000-07-24

PDF (PC)

被引次数

2

摘要： 在超声射流条件下获得了丁二酮在432451nm波段的激光诱导荧光激发谱.在前人标识为000带谱峰的红端观察到3个很弱的谱峰分别位于0,87,97cm-1处(以22182cm-1为0cm-1).在87和97cm-1附近精细扫描,观测到87和97cm-1谱峰的隧道分裂分别为1.05cm-1和1.68cm-1,与理论计算的分裂值符合得很好,从而确定了S1←S0跃迁000带的位置在22182cm-1.87cm-1和97cm-1处的谱峰分别为丁二酮基态S0到激发态S1的卡齿模(G01)和反卡齿模(A01)振动激发.此外,首次对丁二酮S1—S0态激光诱导荧光激发谱进行较完整的标识,得出S1态的羰基骨架扭曲振动模的振动频率91.1cm-1,非谐性常数4.875cm-1.

关键词: 激光诱导荧光, 丁二酮, 超声射流冷却, 光谱

Abstract: The laser-induced fluorescence(LIF) excitation spectra of biacetyl in the range of 432—451 nm were obtained under the supersonic jet condition. Three weaker peaks, which are at 0, 87 and 98 cm-1, respectively(related to 22182 cm-1) were observed in a high sensitivity spectrum at red-hand of 22336 cm-1 peak which was assigned as band origin previously. The tunnel splits for 87 and 97 cm-1 peaks were observed in the hyperfine spectra. They are 1.04 cm-1 and 1.68 cm-1 for 87 cm-1 peak and 97 cm-1 peak respectively. These values are in agreement with calculated values very well. The band origin of S1←S0 transition is now determined at 22182 cm-1. Acomplete assignment of biacetyl LIFspectrum is done for the first time. The frequency of torsion mode is determined to be 91.1 cm-1 , and the enharmonic constant is 4.875 cm-1.

Key words: Laser-induced fluorescence, Biacetyl, Supersonic jet cooling, Spectrum

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