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    Observation of collective effects in the multiphoton ionization of atomic deuterium

    Bowe, P. and Giammanco, F. and O'Neill, R.W. and van der Burgt, Peter J.M. and Slevin, James A. (1998) Observation of collective effects in the multiphoton ionization of atomic deuterium. Physical Review A, 58 (2). pp. 1389-1398. ISSN 1050-2947

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    The yields and time-of-flight spectra for ions produced in three-photon ionization of atomic deuterium have been investigated as a function of laser intensity from 0.4 to 200 MW/cm2. A pulsed laser beam of 243 nm is used, so that the photoionization is resonant with the metastable 2s state of deuterium. The production of resonantly excited 2s atoms is measured by detecting the quenched Lyman-a radiation at time intervals both during and after the laser pulse. The near degeneracy of the 2s-2p state manifold provides a particularly sensitive way to monitor the presence of any electric field in the interaction volume. As the laser intensity is increased, we observe the effects of a collective field arising from the electron-ion plasma produced by the laser pulse. We present the results of a theoretical model where the collective motion of the ions and the electrons is analyzed in terms of the fluid approximation. The essential features of the experimental observations including ion yields, ion time-of-flight spectra, and metastable production versus time, are well described by the theory.

    Item Type: Article
    Keywords: collective effects; multiphoton ionization; atomic deuterium;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 2086
    Depositing User: Dr Peter van der Burgt
    Date Deposited: 17 Aug 2010 15:36
    Journal or Publication Title: Physical Review A
    Publisher: American Physical Society
    Refereed: Yes
      Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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