Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets

MO 27.22: Poster

Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof

Negative ions imaging resulting from HCl photodissociation — •Mikhail Poretskiy¹, Alexey Chichinin², Nicole Teschmit¹, Christof Maul¹, and Karl-Heinz Gericke¹ — ¹Institut f. Physikalische und Theoretische Chemie, TU Braunschweig, Braunschweig, Deutschland — ²Institute of Chemical Kinetics and Combustion, Novosibirsk, Russia

Imaging experiments in chemical dynamics provide dynamical information about elementary chemical processes, e.g. whether a reaction product is translationally or internally excited, what is the nature of the internal excitation and whether or not the spatial product distribution is anisotropic. The imaging of positive ions proved to be a very powerful method for the investigation of photodissociation, whereas negative ions imaging was only rarely used. However it describes better the ion-pair channel of molecules photodissociation, because negative ions in contrast to the positive ions can only result from this channel. In these experiments have to be registered the negative ions produced from the ion-pair dissociation channel of molecules. The positive ion imaging setup was modified for this purpose such that both types of ions (positive and negative) can be registered simultaneously. HCl molecule was chosen as the object of investigation because the H⁺ ions emerging from the ion-pair channel of HCl photodissociation starting from V¹Σ⁺(v=12,J=0) state, were already observed. In the work the 3D velocity distributions of Cl⁻ were registered, the speed distribution as well as the beta parameter of anisotropy were calculated.