Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster IV
Q 56.33: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 9 Poster
Matter wave interferometry with K2 molecules — •Sha Liu1, Ivan Sherstov2, Horst Knöckel1, Christian Lisdat2, and Eberhard Tiemann1 — 1IQO Leibniz Universität Hannover, 30167 Hannover — 2PTB Bundesallee 100, 38116 Braunschweig
We operate a matter wave interferometer on a beam of K2 molecules in a Ramsey-Bordé configuration. The two exits of this interferometer, with molecules in either the excited state or the ground state, allow distinct detection schemes for the matter wave interference. Under certain geometric conditions the observed matter wave interferences are composed of two distinct structures, a Ramsey-Bordé interference structure from four laser beams employed as beam splitters for the matter wave, and an additional Ramsey interference structure formed by only two laser beams acting as beam splitters.
For a better understanding of the Ramsey interferences, we detected the ground state exit in two different distances near the beam splitters and further away downstream of the molecular beam. With active stabilization of the relative phases of the laser beams used as beam splitters the Ramsey interference shows a good phase stability.
We introduced between the beam splitters a laser field being near resonant to a molecular transition from either the excited state or the ground state to another state. Such experiment allows to determine the transition matrix element of the corresponding molecular transition. By changing the collision characteristics of the K atoms by exciting them to Rydberg states, the collisions between potassium atoms and molecules will be investigated.