Hannover 2003 – wissenschaftliches Programm

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A: Atomphysik

A 2: Multiphotonprozesse 1

A 2.6: Fachvortrag

Montag, 24. März 2003, 12:15–12:30, F128

Cluster in strong X-ray pulses — •Ulf Saalmann — Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden

The effect of intense X-ray laser interaction on argon clusters is studied theoretically with a mixed quantum/classical approach. In comparison to a single atom we find that ionization of the cluster is suppressed, which is in striking contrast to the observed behavior of rare-gas clusters in intense optical laser pulses. We have identified two effects responsible for this phenomenon: A high space charge of the cluster in combination with a small quiver amplitude and delocalization of electrons in the cluster. Both effects are more important for the larger cluster investigated and the relative weight of both effects depends on field strength and cluster size. Our findings indicate that in general the coupling of energy from the laser light to matter is less effective at high frequencies [Ulf Saalmann and Jan-Michael Rost, Phys. Rev. Lett. 89 (2002) 143401].