Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Photoelectron Imaging Spectroscopy for (2+1) Resonance-Enhanced Multiphoton Ionization of Atomic Bromine

  • Kim, Yong-Shin (Micro-Electronics Technology Lab., Electronics and Telecommunications Research Institute) ;
  • Jung, Young-Jae (Samsung Electronics Co.) ;
  • Kang, Wee-Kyung (Division of Basic Science, Soong Sil University) ;
  • Jung, Kyung-Hoon (Department of Chemistry and School of Molecular Science (BK21), Korea Advanced Institute of Science and Technology)
  • Published : 2002.02.20
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Abstract

Two-photon resonant third photon ionization of atomic bromine $(4p^5\;^2P_{3/2}\;and\;^2P_{1/2})$ has been studied using a photoelectron imaging spectroscopy in the wavelength region 250 - 278 nm. The technique has yielded simultaneously both relative branching ratios to the three levels of $Br^+(^3P_2,\;^3P_{0.1}\;and^1D_2)$ with $4p^4$ configuration and the angular distributions of outgoing photoelectrons. The product branching ratios reveal a strong propensity to populate particular levels in many cases. Several pathways have been documented for selective formation of $Br^+(^3P_2)$ and $Br^+(^3P_{0.1})$ ions. In general, the final ion level distributions are dominated by the preservation of the ion core configuration of a resonant excited state. Some deviations from this simple picture are discussed in terms of the configuration interaction of resonant states and the autoionization in the continuum. The photoelectron angular distributions are qualitatively similar for all transitions, with a positive $A_2$ anisotropy coefficient of 1.0-2.0 and negligible $A_4$ in most cases, which suggests that the angular distribution is mainly determined by the single-photon ionization process of a resonant excited state induced from the third photon absorption.

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References

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