Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Posters 3: Cold Molecules, Helium Nano Droplets, and Experimental Techniques

MO 13.17: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Observation of coherent interference and determination of strengths and signs of an electric- and magnetic-dipole transition moment in OH — •H.C. Schewe¹, D. Zhang¹, X. Wang¹, G. Meijer^1,2, B. Sartakov³, R. W. Field⁴, and N. Vanhaecke^1,5 — ¹Fritz-Haber-Institut der Max-Planck-Gesellschaft Faradayweg 4-6, 14159 Berlin — ²Radboud University Nijmegen, Institute for Molecules and Materials, Heijendaalseweg 135, 6525 AJ Nijmegen, the Netherlands. — ³General Physics Institute RAS, Vavilov Street 38, 119991 Moscow, Russia — ⁴Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 — ⁵Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, 91405

Spectroscopic investigations of particles are a fundamental method to investigate its structure and dynamics. Higher order transitions like a magnetic-dipole or electric-quradrupole transition reveal a deeper insight into the quantum system itself. Usually these transitions are many orders of magnitude weeker and, therefore, experimentally challenging to determine.

The magnetic dipole transition in the OH radical has been determined in two different ways: (1) using a static electric field, whereby an electric-dipole transition moment is admixed to a magnetic-dipole transition, and (2) using the method of Stark interference: by applying a static magnetic and static electric field, a coherent interference of the electric- and magnetic transition dipole moment could be observed, and the strength and the sign of the transition momenta was determined.