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Journal of Molecular Structure 349 (1995) 265-268 Alignment-orientation transition at optical excitation of molecules in
 

Summary: Journal of
MOLECULAR
STRUCTURE
Journal of Molecular Structure 349 (1995) 265-268
Alignment-orientation transition at optical excitation of molecules in
magnetic field
M. Auzinsh"
aDepartment of Physics, University of Latvia,
19 Rainis boulevard, Riga LV-1586, Latvia
Angular momentum alignment-orientation transition is analyzed for the ground state
of diatomic or linear molecules subjected to the dynamic Stark effect. Analytical expres-
sions are derived for the orientation value. It is shown that, first, orientation of angular
momenta resulting from the action of the dynamic Stark effect is a nonlinear process which
depends quadratically on the intensity of the irradiating light; second, it is a quantum
effect and disappears for the states with large angular momenta; and, third, it occurs only
in the presence of an external magnetic field.
1. INTRODUCTION
As a result of linearly polarized light absorption alignment of the angular momentum
of the excited state of the ensemble of atoms or molecules occurs. For diatomic molecules
in the gas phase this means, in particular, that there appears a preferred plane in which

  

Source: Auzinsh, Marcis - Department of Physics, University of Latvia

 

Collections: Physics