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MO: Fachverband Molekülphysik

MO 14: Poster 2: Biomolecules, Electronic Spectroscopy, Experimental Techniques, Quantum Chemistry, Various Topics

MO 14.30: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.IV

Stark effect enhanced dissociation of high Rydberg states in the D₃ molecule — •Kai Mozer, Peer Cornelis Fechner, and Hanspeter Helm — Physikalisches Institut, Albert-Ludwigs-Universität Freiburg

Various terms of non-adiabatic coupling in molecules show a pronounced isotope dependence. This dependence arises primarily from reduced mass effects and to a lesser extent from effects of nuclear spin. In order to examine isotope effects we have undertaken a comparative study of long-lived D₃ and H₃ molecules in high Rydberg states close to the ionization threshold. This energy region has been studied with great scrutiny in dissociative recombination (DR) experiments [2] and for H₃ in a previous study [1]. In our experiment the long-lived Rydberg states (τ > 500 ns) are induced to dissociate by a short electric field pulse experienced by the molecule when it transverses a miniature spatial region of high electric field (up to 20 kV/cm). We monitor in triple coincidence the three-body decay and compare the results of H₃ and D₃. We also compare our findings with observations by Strasser et al., who examined the DR of cold D₃⁺-ions with slow electrons at the TSR [2]. Research supported by DFG HE 2525/9

[1] P. Fechner and H. Helm, Phys. Rev. A 82, 052523 (2010)

[2] D. Strasser et al., Phys. Rev. A 66, 032719 (2002)