Abstract
We perform time-dependent quantum calculations on the ionization dynamics of helium in intense ultrashort laser fields. A linear model of the atom is used to extract single- and double-ionization yields for a 780 nm excitation. For an intensity of 1015 W cm-2 clear evidence is found for a direct double-ionization process which is caused by rescattering of an electron from the core in the presence of the field. A momentum-space analysis of the wavefunctions shows that in this case both electrons are preferentially emitted in the same direction and with different momenta.
Original language | American English |
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Pages (from-to) | 433-442 |
Number of pages | 10 |
Journal | Journal of Physics B: Atomic, Molecular and Optical Physics |
Volume | 33 |
Issue number | 3 |
DOIs | |
State | Published - 14 Feb 2000 |
Externally published | Yes |