Konstanz 1998 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
Q: Quantenoptik
Q 10: Anwendung ultrakurzer Pulse
Q 10.2: Vortrag
Montag, 16. März 1998, 16:15–16:30, P 603
Ultrafast spectroscopy of hydrated electrons — •A. Kummrow1, M. F. Emde2, M. S. Pshenichnikov2, and D. A. Wiersma2 — 1Max-Born-Institut, Rudower Chaussee 6, 12474 Berlin — 2Ultrafast Laser and Spectroscopy Laboratory, Department of Chemistry, University of Groningen, 9747 AG Groningen, The Netherlands
Photon echo, resonant transient grating and frequency resolved pump-probe are reported on hydrated electrons, using 15 fs excitation pulses. All experiments exhibit a signature of wave packet dynamics attributed to a mode of about 700 wavenumbers. Experiments in heavy water expose the librational nature of this solvent motion. Rigorous calculations using the Brownian oscillator model show that the electron-solvent correlation function can be described by an underdamped oscillator, whose parameters match the librational motions in water. Though gross features can be explained by two-level dynamics, comparison between pump-probe and transient grating experiments signal the importance of three-level effects.