Russian Journal of Physical Chemistry B

, Volume 6, Issue 1, pp 140–148 | Cite as

Relaxation of excited molecules in a medium with memory at short and long times

  • A. S. Moskalenko
  • S. Ya. Umanskii
Effect of External Factors on Physicochemical Transformations


Two qualitatively different approaches to the dynamics of vibrational wave packets in the presence of medium-induced relaxation, with taking into account relaxation memory effects and without taking them into account (Makovian approximation) were compared for a molecular system with one vibrational degree of freedom (the Morse oscillator) in a medium. The time evolution of the populations of levels, mean system energy, and response of “pumping-probing” experiments were calculated. It was found that, as distinct from the Markovian approximation, the approach including memory effects can predict the evolution of a molecular system satisfying the detailed equilibrium principle. The two approaches specified also predict the existence of a qualitative difference of phase characteristics in the behavior of the system at short times.


Memory Effect Femtosecond Pulse Excited Molecule Markovian Approximation Morse Oscillator 
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© Pleiades Publishing, Ltd. 2012

Authors and Affiliations

  1. 1.Semenov Institute of Chemical PhysicsRussian Academy of SciencesMoscowRussia

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