Energy Pooling Collisions: A Step Towards Ionization

  • S. Gozzini
  • C. Gabbanini
  • L. Moi
Part of the NATO ASI Series book series (NSSB, volume 220)


Different collisional processes may contribute to the of a gas under resonant laser excitation1). The aim of this paper is to put in evidence the role of the collisional process called “energy pooling” (EPC) with respect to a possible complete ionization of the vapor under relatively low laser power densities. EPC is described by the reactions:
$$ {{A}^{*}} + {{B}^{*}} \to \left\{ {\begin{array}{*{20}{c}} {{{A}^{{**}}} + B + \Delta E.} \\ {A + {{B}^{{**}}} + \Delta E} \\ \end{array} } \right. $$
where A*,B* are the resonantly laser excited atoms, A**.B** are the atoms in a highly excited level and AE is the energy defect. Being thermal collisions, the reaction is effective when AE is of the order of KT. Alkali atoms satisfy this condition and are, up to now, the more studied atoms for this process2).


Atomic Density Alkali Atom Collisional Process Avalanche Process Cylindrical Mirror Analyzer 
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Copyright information

© Springer Science+Business Media New York 1990

Authors and Affiliations

  • S. Gozzini
    • 1
  • C. Gabbanini
    • 1
  • L. Moi
    • 1
  1. 1.Istituto di Fisica Atomica e Molecolare del C.N.R.PisaItaly

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