物理化学学报 >> 1985, Vol. 1 >> Issue (01): 66-75.doi: 10.3866/PKU.WHXB19850109

研究论文 上一篇    下一篇

一氧化碳的双共振多光子电离研究

沙国河; 钟宪; 赵申; 张存浩   

  1. 中国科学院大连化学物理研究所
  • 收稿日期:1984-06-17 修回日期:1984-10-12 发布日期:1985-02-15

AN OODR-MPI STUDY OF CARBON MONOXIDE

Sha Guohe; Zhong Xian; Zhao Shen; Zhang Cunhao   

  1. Dalian Institute of Chemical Physics; Academia Sinica
  • Received:1984-06-17 Revised:1984-10-12 Published:1985-02-15

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摘要： 用两束脉冲染料激光进行了CO的光学双共振四光子电离, 获得了转动分辩的CO A~(1Π)←X~(1Σ~+)和B~(1Σ~+)←A~(1Π)跃迁的光谱。观察到了在此2+1光子相继吸收中特有的选择定则。动力学研究表明CO基态到A~(1Π)态的双光子吸收是速率决定步骤, 其吸收截面约为1×10~(-49) cm~4 s。还测定了A~(1Π)态的单态转动传能截面。对于宇称指数e守恒、△J×±1的过程的截面约为0.05 nm; 随△J值增大而减小。对相同的△J, e正负变号的过程的截面总是小于e不变过程的截面。

Abstract: Optical-optical double resonance multiphoton ionization(OODR-MPI)spectroscopy is a rapidly developing, versatile technique which should find wide applications in both molecular spectroscopy and molecular dynamics.
In an OODR-MPI study of CO, we irradiate the static sample cell by 2 pulsed dye laser beams. The first UV laser light (“pump beam”) resonantly pumps ground state CO to A~1∏ state via a 2-photon process. Then a second visible laser light (“probe beam”) excites CO A~1∏ to B~1∑~+. The excited B~1∑~. The excited B~1∑~+ molecule further undergoes ionization by absorbing one more UV photon, so the whole process follows a 2+1+1 photon scheme.
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