Wednesday, June 04, 20081:00 PM - 2:00 PMCNLS Conference Room (TA-3, Bldg 1690)|
Laser-assisted single ionization by ion impact: a challenging test for distorted wave theories
M. F. CiappinaMax-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 . 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)  and first Born approximation (LA-FBA) , 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.
 M. F. Ciappina and L. B. Madsen,, Phys. Rev. A 77 023412 (2008).
 M. F. Ciappina and L. B. Madsen, J. Phys. B 39 5037 (2006).
 A. Voitkiv and J. Ullrich, J. Phys. B 34 1673 (2001); ibid, J. Phys. B
34 4383 (2001).h
Host: James Colgan, T-04