Dynamical ionization ignition of clusters in intense short laser pulses

Year: 2003

Authors: Bauer D., Macchi A.

Autors Affiliation: Max-Born-Institut, Max-Born-Strasse 2a, 12489 Berlin, Germany;
Istituto Nazionale per la Fisica della Materia (INFM), Sezione A, Dipartimento di Fisica “Enrico Fermi,” Università di Pisa, Via F. Buonarroti 2, 56127 Pisa, Italy

Abstract: The electron dynamics of rare-gas clusters in laser fields is investigated quantum mechanically by means of time-dependent density-functional theory. The mechanism of early inner and outer ionization is revealed. The formation of an electron wave packet inside the cluster shortly after the first removal of a small amount of electron density is observed. By collisions with the cluster boundary the wave-packet oscillation is driven into resonance with the laser field, hence leading to higher absorption of laser energy. Inner ionization is increased because the electric field of the bouncing electron wave packet adds up constructively to the laser field. The fastest electrons in the wave packet escape from the cluster as a whole so that outer ionization is increased as well.


Volume: 68 (3)      Pages from: 033201-1  to: 033201-10

KeyWords: clusters in laser fields; field ionization;
DOI: 10.1103/PhysRevA.68.033201

Citations: 31
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