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Berlin 2001 – scientific programme

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A: Atomphysik

A 12: Posters Thursday (Ion/Atom/Molecule/Surface Scattering)

A 12.44: Poster

Thursday, April 5, 2001, 12:30–15:00, AT3

Nonlocal effects in the electron energy spectra for associative detachment in collisions of F, Cl and Br with hydrogen atoms — •F.A.U. Thiel2, M. Cízek1, J. Horácek1, and H. Hotop21Department of Theoretical Physics, Charles University Prague, 180 00 Praha 8, Czech Republic — 2Department of Physics, University of Kaiserslautern, D-67663 Kaiserslautern, Germany

Using an improved nonlocal resonance theory, total cross sections, rovibrational final state distributions and electron spectra for low-energy (< 2 eV) associative detachment (AD) collisions between hydrogen atoms and halogen anions X (X= F, Cl, Br) as well as deuterium atoms and F ions have been calculated. The model involves realistic long-range interactions for the H + X systems and takes into account the dependence of the dipole-modified threshold exponent on internuclear distance. Good agreement is found between experimental data for the total AD cross sections and the theoretical results. In the calculated electron energy spectra nonlocal effects are manifest through a step structure which is (almost) independent of collision energy; this structure should therefore be observable in experiments with rather modest collision energy resolution. Electron spectra are presented which correspond to realistic experimental conditions with regard to the energy widths of the electron spectrometer and the collision energy distribution. The final state distributions in the formed HX(v,J) molecules are reported for a thermal kinetic energy distribution at T≈ 300 K; for HF, DF, and HCl the rotational-summed vibrational populations pv are compared with previous results.
This work has been supported by the Deutsche Forschungsgemeinschaft.

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