Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics
MO 14.10: Poster
Mittwoch, 14. März 2012, 16:30–19:00, Poster.IV
Angular distribution of photoelectrons of H2 and its dependence on the internuclear distance — •Ute Lenz1, Till Jahnke1, Markus Schöffler1,2, Thorsten Weber2, Jasmin Titze1, Nadine Neumann1, Hendrik Sann1, Christian Stuck1, Mathew Jones4, Sankar De3, Ali Belkacem2, A L Landers4, C L Cocke3, and Reinhard Dörner1 — 1IKF, University of Frankfurt, D-60438 Frankfurt, Germany — 2LBNL, Berkeley CA 94720 — 3Dept. of Physics, KSU, Cardwell Hall, Manhattan KS 66506 — 4Dept. of Physics, Auburn AL-36849
In the ground state, the internuclear distance of diatomic molecules oscillates around its mean value. The dependence of the photoelectron angular distribution on this distance was analyzed using data measured with COLTRIMS[1] at the Advanced Light Source. Circularly polarized photons were used to doubly ionize hydrogen molecules. After emission of both electrons, the molecule fragments into two positively charged protons. The internuclear distance during the absorption of the photon is antiproportional to the kinetic energy of the remaining H+-ions, namely the KER[3]. To look a bit closer at the dependence of the photoelectron distribution on the KER, the experiment was also performed with linearly polarized photons. The photoelectrons are then only able to leave the molecule parallel but never perpendicular to the polarization vector of the electric field [4]. References: [1] R. Dörner et al., 2000, Phys. Rep. 330 95-192 [2] K. Kreidi et al., 2008, PRL, 100:133005 [3] T. Weber et al., 2004, Nature, 431:437*440 [4] M. S. Schöffler et al., 2008, PRA 013414