Vv. Gridchin et al., Angular distributions of the fragments from Coulomb explosions of diatomicmolecules in intense laser fields, J EXP TH PH, 93(2), 2001, pp. 295-300
The angular distributions of the fragments from a Coulomb explosion of a di
atomic heteronuclear molecule during multielectron dissociative ionization
in a superintense field are considered in terms of classical mechanics. The
patterns of angular distributions of the Coulomb explosion fragments are s
hown to differ in different ranges of laser pulse parameters. In particular
, there are two distinct modes of fragment separation: separation in a Coul
omb field and separation in the field of an effective "fragment+field" pote
ntial. The effective potential includes both the force of Coulomb repulsion
between the fragments and the period-averaged force exerted on the system
by the field; it can be determined by using the Kramers-Henneberger method.
The limits of applicability of the Kramers-Henneberger method to the probl
em in question are discussed. These limits specify the range of field param
eters in which the fragments fly apart in a direction perpendicular to the
field for the initially arbitrary orientation of the molecular axis relativ
e to the field. (C) 2001 MAIK "Nauka/Interperiodica".