Другое : Dissociation of Benzene Molecule in a Strong Laser Field
Dissociation of Benzene Molecule in a Strong Laser Field
Dissociation of
Benzene Molecule in a Strong Laser Field
M. E. Sukharev, General
Physics Institute of RAS
Dissociation of
benzene molecule in a strong low-frequency linearly polarized laser field is
considered theoretically under the conditions of recent experiments. Analogy
with the dissociation of diatomic molecules has been found. The dissociation
probability of benzene molecule has been derived as a function of time. The
three-photon dissociate process is shown to be realized in experiments.
Introduction.
The number of
articles devoted to the interaction of molecules with a strong laser field
increased considerably in recent years. The main features of interaction
between diatomic molecules and a laser radiation were considered in a great
number of experimental [1-5] and theoretical [6-9] papers. Classical and
quantum investigations of spatial alignment of diatomic molecules and their
molecular ions in a strong laser field, as well as ionization and dissociation
of these molecules and their molecular ions account for physical pictures of
all processes.
However, when
considering complex organic molecules, we observe physical phenomena to be
richer, and they are not thoroughly investigated. Most of results obtained for
diatomic molecules can be generalized to the multi-atomic molecules. This short
paper contains the results of theoretical derivations for dissociation of
benzene molecule C6H6 in the field of linearly polarized Ti:Sapphire laser.
Data were taken from experimental results by Chin’s group, Ref. [4]. We use the
atomic system of units throughout the paper.
Theoretical approach.
Let us consider the
benzene molecule C6H6 in the field of Ti:Sapphire laser with the wavelength l=400 nm, pulse
length t=300 fs and maximum intensity Imax=2´1014 W/cm2.
According to Ref. [4] first electron is ejected from this neutral molecule and
then the dissociation of C6H6+-ion occurs.
The most probable
channel for decay of this ion is the separation into the equal parts :
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