Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 22: Poster I

MO 22.29: Poster

Samstag, 5. März 2005, 10:30–12:30, Poster HU

Alignment in the photodissociation of HCl at 236nm using three-dimensional mass-resolved ion imaging — •Thorben Cordes¹, Alexey I. Chichinin², Niels Goedecke¹, Peter S. Shternin³, Oleg S. Vasyutinskii³, Christof Maul¹, and Karl-Heinz Gericke¹ — ¹Institut für Physikalische und Theoretische Chemie, TU - Braunschweig, D - 38106 Braunschweig — ²Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russia — ³Ioffe Institute, St. Petersburg, Russia

The electronically excited states HCl(E¹Σ⁺, v’ = 0, J’) and HCl(V¹Σ⁺ , v’ = 12, J’), denoted HCl^*, has been prepared by two-photon resonant absorption of the ground state HCl. The consequent absorption of two photons at the same wavelength results in production of H⁺ ions. The speed distributions and anisotropy parameters β for these ions have been determined by three-dimensional photofragment ion imaging technique. The alignment of the excited state of HCl was determined from the comparison of the velocity (speed and angle) distributions of H⁺ ions obtained for j′=j″=0 and j′=j″=1 rotation transitions.