Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MO: Molekülphysik
MO 22: Poster I
MO 22.22: Poster
Samstag, 5. März 2005, 10:30–12:30, Poster HU
Coherence of molecules in condensed phase: Cl2 in Ar — •Mizuho Fushitani, Matias Bargheer, Markus Gühr, and Nikolaus Schwentner — Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee, 14195 Berlin, Germany
Vibrational and electronic coherence of Cl2 molecules in solid Ar was studied by using a fs pump probe technique. We observed wavepacket oscillations with two different periods: 300fs and 500fs. The shorter round trip time is assigned to the vibrational motion of the B state of Cl2 while the longer period is due to the zone boundary lattice vibration of solid Ar. The same 500fs oscillation was also observed in the system of Br2/Ar[1], which indicates that the modulation should be attributed to the host dynamics, not to the chromophore.
The electronic coherence between the electronic ground state and the excited B state of Cl2 in solid Ar was studied by using a phase locked pulse pair (PLPP) as a pump pulse. Depending on the relative phase of the PLPP after each vibrational period, more or less population can be transferred to the B state if molecules keep the phase information. The population created by a PLPP was transferred to an ion-pair manifold state of Cl2 by a probe pulse, and the LIF from the state was monitored as a function of the delay between the PLPP. We observed vibrational recurrence around 210 fs in the LIF interferogram using a PLPP at 535 nm. The contribution of zero phonon line and phonon side band to the recurrence will be discussed.
[1] M. Gühr and N. Schwentner, PCCP submitted.