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Wednesday, June 04, 2008
1:00 PM - 2:00 PM
CNLS Conference Room (TA-3, Bldg 1690)


Laser-assisted single ionization by ion impact: a challenging test for distorted wave theories

M. F. Ciappina
Max-Planck-Institut fšur Physik komplexer Systeme, Nšothnitzer Str. 38, D-01187 Dresden, Germany

In this talk we discuss single ionization in laser-assisted high-energy non-relativistic ion-atom collisions. We show that the low-energy angular differential electron spectrum may be enhanced significantly by a weak, in atomic terms, external laser-field. With increasing the strength of this assisting field, the electron spectrum develops a plateau with a characteristic cut-off [1]. In the plateau region we predict distinct multiphoton peaks separated by the photon-energy. Within the present laser-assisted continuum-distorted-wave eikonal-initial-state (LA-CDW-EIS) theory, this effect can be easily traced out and may be related to the dynamics in the two-body electron-projectile subsystem. Other first order approximation theories, e.g. the laser-assisted distorted wave Born (LA-DWB) [2] and first Born approximation (LA-FBA) [3], do not account for the phase-distortion of the target electron by the incoming projectile and consequently the associated plateau, cut-off and multiphoton features are not predicted by these approaches. The combined process where an electron is ionized by a heavy ion and subsequently moves in the laser field and under the influence of the Coulomb fields of the projectile and the target represents a stringent test for distorted wave theories.

References [1] M. F. Ciappina and L. B. Madsen,, Phys. Rev. A 77 023412 (2008). [2] M. F. Ciappina and L. B. Madsen, J. Phys. B 39 5037 (2006). [3] A. Voitkiv and J. Ullrich, J. Phys. B 34 1673 (2001); ibid, J. Phys. B 34 4383 (2001).h

Host: James Colgan, T-04