Hannover 2003 – wissenschaftliches Programm
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  is examined by simulating the external force due to the polarizability - field interaction.
 M. Bargheer, J. Pietzner, P. Dietrich, and N. Schwentner, J. Chem. Phys. 115, 9827 (2001).
 M. Bargheer, M. Gühr, and N. Schwentner, J. Chem. Phys. 117, 5 (2002).
 J. Ortisogo, M. Rodrígues, M. Gupta, and B. Friedrich, J. Chem. Phys. 110, 3870 (1999).