NEW THEORETICAL PHYSICS FINDINGS FROM YEREVAN STATE UNIVERSITY PUBLISHED

News of Science
February 22, 2009

"The theoretical and numerical results on the nonlinear dynamics of
an atom in the fields of two counterpropagating radiation beams of
different frequencies are presented. Both resonant and nonresonant
interaction regimes are investigated," scientists writing in the
Journal of Experimental and Theoretical Physics report.

"The atom center-of-mass energy dependence on the field amplitudes
exhibits the nonlinear threshold effect of reflection of an atom in
the interference field. This phenomenon leads to the atom acceleration
or deceleration depending on its initial state. This acceleration or
deceleration is base of a shock character because of the impact with
the moving potential barrier; it occurs at ultrashort distances on
the order of radiation field wavelengths," wrote G.F. Mkrtchian and
colleagues, Yerevan State University.

The researchers concluded: "Furthermore, the role of initial conditions
is discussed and analyzed numerically."

Mkrtchian and colleagues published their study in the Journal of
Experimental and Theoretical Physics (Nonlinear interaction of a
two-level atom with counterpropagating radiation beams of different
frequencies. Journal of Experimental and Theoretical Physics,
2008;107(5):738-745).

Additional information can be obtained by contacting G.F. Mkrtchian,
Yerevan State University, Dept. of Quantum Electrical, Yerevan 0025,
Armenia.

The publisher of the Journal of Experimental and Theoretical Physics
can be contacted at: Maik Nauka, Interperiodica, Springer, 233 Spring
St., New York, NY 10013-1578, USA.