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MO: Fachverband Molekülphysik

MO 18: Femtosekundenspektroskopie

MO 18.2: Poster

Dienstag, 11. März 2008, 14:00–19:00, Poster C1

Controlling the photodissociation dynamics of methyl iodide — A. Klumpp¹, M. Krug¹, •C. Lux¹, M. Wollenhaupt¹, J. Dura², J.G. Izquierdo², r. de Nalda², L. Banares², and T. Baumert¹ — ¹Universität 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)