Frankfurt 2006 – wissenschaftliches Programm
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MO: Molekülphysik
MO 14: Ultrafast IR and Raman Probe and Control
MO 14.4: Vortrag
Montag, 13. März 2006, 17:15–17:30, H12
Liquid phase interactions studied with time resolved hyper-Rayleigh scattering — •Tiago Buckup1, Marcus Motzkus1, Ricardo Correia2, Júlio Schoffen2, and Silvio Cunha2 — 1Physikalische Chemie, Phillips Universität Marburg, 35043 Marburg, Germany — 2Instituto de Física, UFRGS, Porto Alegre, Brazil
The liquid phase is well-known for its local order, where orientation and position correlations between molecules only prevail for several nanometers and where the corresponding interactions happen at different timescales. Due to the difficulties of studying the superposition of many-body interactions in the liquid phase, there is a high demand for new techniques which provide additional information about these complex interactions. This work introduces the concept of time resolved hyper-Rayleigh scattering with femtosecond resolution (TRHRS). TRHRS is based on the generation of elastic incoherent second harmonic radiation, a process related to the first molecular hyperpolarizability β. The obtained relaxation behavior for two model liquids (carbon tetrachloride and acetonitrile) agrees consistently with those obtained from spectral domain techniques. TRHRS opens the possibility not just to detect the long wings hardly seen in scattering spectra, but also to investigate the interactions in biological systems with high spatial and temporal resolution and to act as a new probe for orientation control experiments.