Db. Milosevic et F. Ehlotzky, ELECTRON-ATOM IONIZING COLLISIONS IN THE PRESENCE OF A BICHROMATIC LASER FIELD, Physical review. A, 56(5), 1997, pp. 3879-3887
A theory of electron-atom ionizing collisions in the presence of a bic
hromatic laser field is developed. The incident and scattered electron
of high energy is described by Volkov states, the atomic ground state
is dressed by the laser field to first order in the electric-field st
rength, and the atomic continuum state that corresponds to the ejected
slow electron is dressed by the laser field to all orders in the fiel
d strength, but in an approximate way. It is shown that the dressing o
f these continuum states is mainly responsible for the different effec
ts that a bichromatic laser field introduces into this process. These
effects are more pronounced compared to similar effects recently obser
ved in an analysis of the target dressing in free-free transitions in
a bichromatic laser field. The possibility of the coherent phase contr
ol is analyzed and it is shown that the triple differential cross sect
ion (TDCS) can be changed by almost one order of magnitude by changing
the relative phase between the two laser field components. The TDCS a
s a function of the relative phase, the number of absorbed (emitted) p
hotons, and the laser electric-field strength shows a specific behavio
r that is mainly determined by the properties of the generalized Besse
l functions appearing In our results. It is also shown that these effe
cts are particularly pronounced for rather small scattering angles of
the fast electron.