Resonant multiphoton ionization spectra of molecules and molecular fragments. Annual technical report, October 1987--September 1988

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The objective of the research under this contract is to carry out studies of resonant enhanced multiphoton ionization (REMPI) processes in molecules. In the (n+1)-REMPI process of interest an atom or molecule in a specific initial state absorbs n photons making a transition to an intermediate state from which it is subsequently ionized by absorption of an additional photon. The studies are designed to provide a quantitatively robust analysis and prediction of key spectral features in several ongoing experimental studies and potentially practical applications of this technique. The specific problems of interest to the authors in these studied are (1) ... continued below

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13 p.

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Creator: Unknown. December 31, 1988.

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Description

The objective of the research under this contract is to carry out studies of resonant enhanced multiphoton ionization (REMPI) processes in molecules. In the (n+1)-REMPI process of interest an atom or molecule in a specific initial state absorbs n photons making a transition to an intermediate state from which it is subsequently ionized by absorption of an additional photon. The studies are designed to provide a quantitatively robust analysis and prediction of key spectral features in several ongoing experimental studies and potentially practical applications of this technique. The specific problems of interest to the authors in these studied are (1) the vibrational distributions of ions that can be expected in REMPI of small molecules and molecular fragments with particular emphasis on their non-Franck-Condon behavior. Such non-Franck-Condon behavior introduces serious complications in the use of the technique for state-specific production of ions, e.g., O{sub 2}{sup +}({nu}) and OH{sup +}({nu}), and in the extraction of state populations from REMPI signals, (2) rotational distributions of ions that can be produced in various REMPI schemes and how these distributions can be tuned by choice of the resonant state and influenced by the molecular character of the photoelectron, and (3) the circular dichroism in photoelectron angular distributions, i.e., the difference in photoelectron angular distributions produced by right- and left-circularly polarized, and their use as a probe of molecular alignment. Here the author will summarize the progress that has been made to date in the studies of these features and applications of REMPI of molecules and molecular fragments. A significant feature of these studies, which will be explicitly assumed throughout the discussion below, is that they are carried out using quantitatively reliable molecular photoelectron orbitals.

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13 p.

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OSTI as DE98006381

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  • Other Information: PBD: [1988]

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  • Other: DE98006381
  • Report No.: DOE/ER/60513--T10
  • Grant Number: FG03-87ER60513
  • DOI: 10.2172/656811 | External Link
  • Office of Scientific & Technical Information Report Number: 656811
  • Archival Resource Key: ark:/67531/metadc707858

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  • December 31, 1988

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  • Sept. 12, 2015, 6:31 a.m.

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  • Feb. 20, 2017, 3:56 p.m.

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Resonant multiphoton ionization spectra of molecules and molecular fragments. Annual technical report, October 1987--September 1988, report, December 31, 1988; Pasadena, California. (digital.library.unt.edu/ark:/67531/metadc707858/: accessed November 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.