Darmstadt 2008 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Interaction with intense laser pulses I: Atoms
A 5.2: Vortrag
Dienstag, 11. März 2008, 11:30–11:45, 3C
Wavelength Dependence of Strong-Field Non-Sequential Multiple Ionization — •Manuel Kremer1, Artem Rudenko1, Bettina Fischer1, Oliver Herrwerth1, Vitor de Jesus2, Karl Zrost1, Georg Gademann1, Konstantin Simeonidis1, Thorsten Ergler1, Bernold Feuerstein1, Claus Dieter Schröter1, Robert Moshammer1, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, 69117 Heidelberg — 2Centro Federal de Educação Technológica de Química de Nilópolis, Rio de Janeiro, Brazil
We present recoil-ion momentum distributions for Non-sequential double and multiple ionization (NSDI, NSMI) of Ar and Ne by 1300nm laser pulses (pulse duration 35-40fs, peak intensity 3−5*1014W/cm2) measured with a *Reaction Microscope*, and compare them with our earlier results at 800nm. The spectra at both wavelengths can be consistently interpreted within a simple semiclassical model which we developed earlier in order to explain atomic structure dependence observed at 800nm. There two mechanisms of NSDI have been considered: (i) direct (e,2e) ionization by the returning electron and (ii) recollision-induced excitation with subsequent field ionization (RESI). A deeper minimum at zero longitudinal momentum for 1300nm is shown to be due to the suppression of the contribution from the latter channel. In good agreement with the results of the calculation, we found that at both wavelengths RESI mechanism is more important for Ar than for Ne.