Berlin 2001 – wissenschaftliches Programm

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MO: Molekülphysik

MO 7: Posters Wednesday: Theory: Structure and Dynamics

MO 7.4: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT3

Selective preparation of ground state wave–packets: a theoretical analysis of femtosecond pump–dump–probe experiments on the potassium dimer — •Zhenwen Shen, T. Chen, M. Heid, W. Kiefer, and V. Engel — Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg,Germany

We present simulations on pump–dump–probe experiments performed on the potassium dimer [1]. The interaction of two time–delayed laser pulses prepares vibrational wave packets in the electronic ground state. The quantum calculations reveal to what extent it is possible to prepare a ground state superposition of states with high versus low vibrational quantum numbers by changing the pump–dump delay time. It is shown that transient signals may exhibit interference effects which are due to characteristics of ground state wave–packets composed of two components showing different vibrational dynamics. In this way the signals are able to yield information about vibrational overtone motion.

[1] R. Pausch, M. Heid, T. Chen, H. Schwoerer, W. Kiefer, J. of Raman. Spectrosc. 31, 7 (2000).