TY - JOUR
T1 - On the mechanism of strong-field double photoionization in the helium atom
AU - Lein, M.
AU - Gross, E. K.U.
AU - Engel, V.
PY - 2000/2/14
Y1 - 2000/2/14
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0033888660&partnerID=8YFLogxK
U2 - 10.1088/0953-4075/33/3/312
DO - 10.1088/0953-4075/33/3/312
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AN - SCOPUS:0033888660
SN - 0953-4075
VL - 33
SP - 433
EP - 442
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
IS - 3
ER -