Hannover 2003 – wissenschaftliches Programm

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MO: Molekülphysik

MO 6: Poster I

MO 6.23: Poster

Dienstag, 25. März 2003, 16:00–18:30, Lichthof

A classical MD study on strong-field alignment and photodissociation vs. recombination of ClF molecule in solid argon. — •Toni Kiljunen, Matias Bargheer, Markus Gühr, and Nikolaus Schwentner — Institut für Experimentalphysik, FU-Berlin, Arnimallee 14, 14195 Berlin

Molecular alignment by a strong non-resonant laser pulse and subsequent pump-probe experiment [1,2] is investigated by classical molecular dynamics simulations. The pump-probe scheme consists of time-delayed excitations X ¹Σ₀ → (B ³Π₀ or ¹Π₀) → ionic states of ClF molecule in Ar crystal.

We show the yield of dissociating ClF trajectories and discuss the fate of cage-exiting F atoms as a competing event to geminate recombination. Emphasis is put on recombining trajectories. We extract the round-trip times for the excited state No-dqwave packetNo-dq motion that explains the time dependence of the measured signal, and show the (p,q) phase-space conditions dictating the processes after excitation. Tendency of molecular alignment in the solid host in the presence of an intense ultrashort laser field [3] is examined by simulating the external force due to the polarizability - field interaction.

[1] M. Bargheer, J. Pietzner, P. Dietrich, and N. Schwentner, J. Chem. Phys. 115, 9827 (2001).

[2] M. Bargheer, M. Gühr, and N. Schwentner, J. Chem. Phys. 117, 5 (2002).

[3] J. Ortisogo, M. Rodrígues, M. Gupta, and B. Friedrich, J. Chem. Phys. 110, 3870 (1999).