Hannover 2003 – wissenschaftliches Programm
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MO: Molekülphysik
MO 16: Ultraschnelle molekulare Dynamik
MO 16.5: Vortrag
Freitag, 28. März 2003, 15:00–15:15, B 305
Investigation of the energy transfer after resonant vibrational excitation using pump-probe spectroscopy: N2O on NaCl(100) — •Britta Redlich1,2, Lex van der Meer1, Gerard Meijer1,3,4, Gert von Helden1, and Helmut Zacharias2 — 1FOM Institute Rijnhuizen, Edisonbaan 14, 3439 MN Nieuwegein, The Netherlands — 2Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 3Department of Molecular and Laser Physics, University of Nijmegen, Toernooidveld 1, 6525 ED Nijmegen, The Netherlands — 4Fritz-Haber-Institute of the Max-Planck-Society, Faradayweg 4-6, 14195 Berlin, Germany
The relaxation of a molecular system condensed on a surface after vibrational excitation is investigated using pump-probe spectroscopy. An infrared light pulse of the Free Electron Laser for Infrared eXperiments No-dqFELIXNo-dq is used to pump resonantly a specific intramolecular vibration of the system N2O condensed on NaCl(100) as well as to probe the same transition after a variable time delay. The change in transmission is recorded spectrally resolved and the decay can be fit using a bi-exponential function. The characteristic decay times are on the order of ∼50 ps for a fast channel and ∼10 ns for a slow channel. They are found to depend on the temperature at which the N2O layer is prepared. The dependence of the pump-probe signal on the laser fluence and on the polarization of laser pulses is presented. The origin of the different decay channels will be discussed.