Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 12: Femtosecond Spectroscopy III

MO 12.2: Vortrag

Dienstag, 19. März 2013, 14:30–14:45, F 102

Laser photofragmentation and ultrafast time-resolved dynamics of mass-selected ionic species — •Christoph Riehn, Yevgeniy Nosenko, Dimitri Imanbaew, and Sebastian Kruppa — Fachbereich Chemie,TU Kaiserslautern, D-67663 Kaiserslautern, Erwin-Schroedinger-Str. 52

The influence of metal-metal or metal-ligand interaction on elementary processes (electronic coupling; energy, charge transfer and fragmentation dynamics) of mass-selected, isolated metal-ligand species is studied at a 50 fs-100 ps time scale. The newly designed experimental setup consists of a kHz 50 fs-amplified Ti:Sa-laser system equipped with two optical parametrical generator units and an electrospray ion trap mass spectrometer. The time-resolved measurements are based on pump-probe transient photofragmentation.[1] Our first results for the transient photofragmentation of protonated tryptophan at various pump-probe wavelengths will be discussed [2] and compared to the tryptophan-Ag+ complex, where charge transfer plays an important role. Finally, we present time-resolved measurements on a dianionic Diplatinum-complex [Pt2(P2O5H2)4H2]2- and its silver-containing derivative [Pt2(P2O5H2)4AgH]2-. It shows ultrafast electronic dynamics in the gas phase detected via the parallel channels of electron detachment and photofragmentation.

References: [1] D. Nölting, T. Schultz, I.V. Hertel, R. Weinkauf, Phys. Chem. Chem. Phys. 2006, 8, 5247- 5254. [2] H. Kang, C. Dedonder-Lardeux, C. Jouvet, G. Gregoire, C. Desfrancois, J.-P. Schermann, M. Barat, J. A. Fayeton, J. Phys. Chem. A 2005, 109, 2417-2420.