Berlin 2005 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
MO: Molekülphysik
MO 22: Poster I
MO 22.27: Poster
Samstag, 5. März 2005, 10:30–12:30, Poster HU
Photoionization and photodissociation of HCl near 236 nm using three-dimensional ion imaging — •Niels Gödecke1, Alexey Chichinin2, Christof Maul1, and Karl-Heinz Gericke1 — 1Institut für Theoretische und Physikalische Chemie, TU Braunschweig, D-38106 Braunschweig — 2Institute of Chemical Kinetics and Combustion, 630090 Novosibirsk, Russia
The electronically excited state HCl (B1Σ+, J′ = 0), denoted HCl*, has been prepared by two-photon resonant absorption of ground state HCl at 236.000 nm and at 238.719 nm, respectively. The consequent one- or two-photon excitation at the same wavelength results in production of H+, Cl+ and HCl+ ions. The speed distributions and anisotropy parameters β for these ions have been determined by three-dimensional photofragment ion imaging technique. It has been shown that the ions are produced via different pathways, which may be denoted as resonance enhanced multi-photon ionization (REMPI) 2+1i, 2+1+1i, 2+1i+1, and 2+2, where the index i labels the ionizing photon. The measured velocity distribution for HCl+ characterises the electron recoil in the photoionization of HCl+ in other cases the information on the photodissociation steps was obtained.