Laser-assisted ion-atom collisions: Plateau, cutoff, and multiphoton peaks

Marcelo F. Ciappina, Lars Bojer Madsen

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We study ionization in laser-assisted high-energy nonrelativistic ion-atom collisions and show that the low-energy angular differential electron spectrum may be enhanced by five orders of magnitude by an external field of strength less than 1/100 of the atomic field. With increasing strength of the assisting field, the energy spectrum develops a plateau with a characteristic cutoff. In the plateau region we predict distinct multiphoton peaks separated by the photon energy of the assisting field. In the present laser-assisted continuum-distorted-wave eikonal-initial-state theory, this effect may be related to the dynamics in the two-body electron-projectile subsystem. The laser-assisted distorted wave Born and first Born approximation do not account for the phase-distortion of the target electron by the incoming projectile and consequently the associated plateau, cutoff, and multiphoton features are not predicted by these latter theories.

Original languageEnglish
Article number023412
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number2
StatePublished - 25 Feb 2008
Externally publishedYes


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