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Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Photochemie 2

MO 21.3: Talk

Thursday, March 5, 2009, 14:30–14:45, VMP 6 HS-G

Photodissociation dynamics by means of a revised version of velocity-map ion-imaging — •Andreas Schmaunz, Uwe Kensy, Alkwin Slenczka, and Bernhard Dick — University of Regensburg, Regensburg

Velocity-map ion-imaging [1] as a refined version of ion-imaging [2] provides the full three-dimensional velocity distribution of an atomic fragment produced via photolysis of a molecule. The velocity distribution reveals the kinetic and internal energy of the counter fragment. Thus, the full dynamic of the photodissociation is obtained. In the case of a molecular fragment the analysis of the full dynamics requires the measurement of an ion-image for each of the energetically accessible internal states. This procedure is extremely time consuming if not impossible due to the spectral overlap. We present a new technique, a hybrid of real-time ion-counting [3] and REMPI spectroscopy. It allows to obtain the angular and velocity distribution for the entire set of internal states of the molecular fragment within the time necessary to record a common REMPI spectrum. The method will be demonstrated for the photolysis of NO2 by recording the NO fragment. These data provide insight into the dissociation dynamics far beyond conventional data reported on this system so far.

[1] A. T. J. B. Eppink and D. H. Parker, Rev. Sci. Instrum. 68, 3447 (1997). [2] D. W. Chandler and P. L. Houston, J. Chem. Phys. 87, 1445 (1987). [3] B. Y. Chang, R. C. Hoetzlein, J. A. Mueller, J. D. Geiser, and P. L. Houston, Rev. Sci. Instrum. 69, 1665 (1998).

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