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Probing Excited States with Multiphoton Ionization

  • J. L. Dehmer
  • P. M. Dehmer
  • S. T. Pratt
  • M. A. O’Halloran
  • F. S. Tomkins
Part of the NATO ASI Series book series (NSSB, volume 181)

Abstract

Resonance enhanced multiphoton ionization (REMPI) utilizes tunable dye lasers to ionize an atom or molecule by first preparing an excited state by multiphoton absorption and then ionizing that state before it can decay. This process is highly selective with respect to both the initial and resonant intermediate states of the target, and it can be extremely sensitive. In addition, the products of the REMPI process can be detected as needed by analyzing the resulting electrons, ions, fluorescence, or by additional REMPI. This points to a number of opportunities for exploring excited state physics and chemistry at the quantum-state-specific level. Here we will begin with a brief overview of the large variety of experimental approaches to excited state phenomena made possible by REMPI. Then we will examine in more detail several examples which illustrate some of these approaches: First, we will discuss three photon resonant, four photon (3+1) ionization of H2 via the C1 IIu state. Strong non-Franck-Condon behavior in the photoelectron spectra of this simple Rydberg state has led to the examination of a variety of dynamical mechanisms. Of these, the role of doubly excited autoionizing states now seems decisive.

Keywords

Photoelectron Spectrum Rydberg State Atomic Iodine Multiphoton Ionization Photoelectron Peak 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1988

Authors and Affiliations

  • J. L. Dehmer
    • 1
  • P. M. Dehmer
    • 1
  • S. T. Pratt
    • 1
  • M. A. O’Halloran
    • 1
  • F. S. Tomkins
    • 1
  1. 1.Argonne National LaboratoryArgonneUSA

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