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Darmstadt 2008 – scientific programme

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MO: Fachverband Molekülphysik

MO 18: Femtosekundenspektroskopie

MO 18.2: Poster

Tuesday, March 11, 2008, 14:00–19:00, Poster C1

Controlling the photodissociation dynamics of methyl iodideA. Klumpp1, M. Krug1, •C. Lux1, M. Wollenhaupt1, J. Dura2, J.G. Izquierdo2, r. de Nalda2, L. Banares2, and T. Baumert11Universität Kassel, Institut für Physik und — 2Universidad de Complutense Facultad de Ciencias Quimicas

Due to its simple structure but nevertheless complex and interesting dissociation dynamics methyl iodide is a well investigated molecule in femtochemistry (e.g.[1,2]). In previous fs experiments (e.g. [2]) the methyl iodide bond was broken and the methyl was probed with REMPI radiation . In our experiment, we used a shaped femtosecond 800 nm pulse [3] in addition to exert control during the pump probe sequenze. Pulse shaping was performed in the frequency domain applying polynomial spectral phases. The methyl states (3Q0,1Q1 ν=0, 1Q1 ν=1) [4] were detected using a velocity-map-imaging method [5]. Using the pulse shaper in combination with an evolutionary algorithm the ratio of the ion yield corresponding to molecular states was optimized. The yields of the above photo-products were studied as a function of the relative pulse delay and chirp parameter in a two dimensional map.

[1] D. Zhong and A.H. Zewail, J.Phys.Chem.A 102, 4031 (1998)

[2] R. de Nalda, et al., J.Chem.Phys. 126, 021101 (2007)

[3] A. Präkelt et al., Rev.Sci.Instr., 74, 11, 4950 (2003)

[4] Y. Amatatsu, et al., J. Chem. Phys. 104, 9783 (1996)

[5] A.T.J.B. Eppink et al., Rev.Sci.Instrum. 68, 3477 (1997)

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