Title: On the mechanism of strong-field double photoionization in the helium atom
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 1015W cm-2clear 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.
Publication Year: 2000
Publication Date: 2000-01-24
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 31
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