a,
b, A. Gazibegovi
-Busulad
i
a,
M. Busulad
i
c,
D. B. Milosevi
a,
b, d, and W. Beckerb
E. Hasovia,
b, A. Gazibegovi-Busuladia,
M. Busuladic,
D. B. Milosevia,
b, d, and W. Beckerb
a Faculty of Science, University of Sarajevo, Zmaja od Bosne 35, 71000 Sarajevo, Bosnia and Herzegovina
b Max-Born-Institut, Max-Born-Str. 2a, 12489 Berlin, Germany
c Medical Faculty, University of Sarajevo, 
ekalu
a 90, 71000 Sarajevo, Bosnia and Herzegovina
d Academy of Sciences and Arts of Bosnia and Herzegovina, Bistrik 7, 71000 Sarajevo, Bosnia and Herzegovina
e-mail: milo@bih.net.ba
Received October 21, 2011
Abstract—We investigate high-order above-threshold ionization (HATI) of homonuclear diatomic molecules
by a few-cycle laser pulse. In order to describe molecular HATI in ultrashort laser pulses we have modified our
molecular improved strong-field approximation (MISFA), which was developed for long laser pulses and in
which the rescattering of the ionized electron off the parent ion was described using the first-order Born approx-
imation (1BA). Now, we introduce the so-called molecular low-frequency approximation (MLFA) in which the
elastic rescattering amplitude is calculated exactly. The angle-resolved electron energy spectra for HATI of N2
and O2 obtained using the MLFA are compared with those obtained within the MISFA. The difference between
these spectra becomes significant for larger (re)scattering angles. This is due to the fact that the exact scattering
amplitude, used in the MLFA, has minima for some values of the rescattering angles that are absent in the 1BA.
Also, the rescattering plateau is lower for the MLFA spectra. We investigate the influence of the carrier-enve-
lope phase on the high-energy part of the molecular HATI spectra. As in the atomic case, the left-right (back-
ward-forward) asymmetry is also observed in the molecular case.
DOI: 10.1134/S1054660X12120110
IAPC Nauka home page | journal home page | top
If you have any problems with this server, contact webmaster@pleiadesonline.com.