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Journal of Chemical Physics / Volume 135 / Issue 21 / ARTICLES / Gas Phase Dynamics and Structure: Spectroscopy, Molecular Interactions, Scattering, and Photochemistry

J. Chem. Phys. 135, 214310 (2011); http://dx.doi.org/10.1063/1.3663618 (6 pages)

Competitive ionization processes of anthracene excited with a femtosecond pulse in the multi-photon ionization regime

M. Goto and K. Hansen

Department of Physics, University of Gothenburg, 41296 Gothenburg, Sweden

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(Received 5 September 2011; accepted 2 November 2011; published online 6 December 2011)

To clarify the ionization mechanism of large molecules under multi-photon ionization conditions, photo-electron spectroscopic studies on anthracene have been performed with electron imaging technique. Electron kinetic energy distributions below a few eV reveal that three kinds of ionization channels coexist, viz., vertical ionization, ionization from Rydberg states, and thermionic hot electron emission. Their relative yield is determined by the characteristic of the laser pulse. The duration in particular influences the ratio between the first two processes, while for higher intensities the last process dominates. Our results provide strong evidence that internal conversion plays an important role for the ionization of the molecule.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENT
  3. RESULTS AND DISCUSSION
    1. General features
    2. Excitation of Rydberg states
    3. Vertical multi-photon ionization
    4. Assigning the high energy electrons
    5. Discussion of the ionization mechanism
  4. SUMMARY

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KEYWORDS and PACS

Keywords

high-speed optical techniques, molecule-photon collisions, multiphoton processes, nonradiative transitions, organic compounds, photoelectron spectra, photoionisation, Rydberg states, thermionic electron emission

PACS

  • 33.80.Eh

    Autoionization, photoionization, and photodetachment

  • 33.80.Rv

    Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states)

  • 32.80.Ee

    Rydberg states

  • 33.60.+q

    Photoelectron spectra

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3663618

PUBLICATION DATA

ISSN

0021-9606 (print)  
1089-7690 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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