Berlin 2001 – scientific programme

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MO: Molekülphysik

MO 10: Spectroscopy I: Ultra-short Time Spectroscopy

MO 10.4: Talk

Thursday, April 5, 2001, 16:30–16:45, H1058

Classical simulations on the femtosecond spectroscopy of I₂ in rare-gas environments: relaxation and predissociation processes — •Volker Engel¹, Vladimir A. Ermoshin², and Andrej K. Kazansky² — ¹Institut für Physikalische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — ²Fock Institute of Physics, The University of St.Petersburg, 198504 St.Petersburg, RUSSIA

The femtosecond time-resolved spectroscopy of iodine molecules in rare-gas environments is investigated theoretically using classical mechanics. Atom-molecule collisions induce relaxation and dephasing processes which results in modifications of pump-probe fluorescence signals. A comparison of the calculated signals with experimental transients documents, that a classical description is well suited to describe the underlying dynamical processes. It is shown, that the introduction of particular coordinates for the iodine internal motion allows for the separation of the time-scales which characterize vibrational relaxation and dephasing, respectively [1].

[1] A. K. Kazansky, V. A. Ermoshin, and V. Engel, J. Chem. Phys. 113, 1 (2000).