Düsseldorf 2007 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 29: Poster: Cold Molecules
MO 29.7: Poster
Dienstag, 20. März 2007, 16:30–18:30, Poster A
Collisions between cold, trapped ND3 and hot gases — •Christian Sommer, Sebastian Pohle, Thomas Rieger, Laurens D. van Buuren, Pepijn W.H. Pinkse, and Gerhard Rempe — Max-Planck-Institut für Quantenoptik, Hans
Currently, there is a wide interest to trap cold molecules at temperatures around 1 Kelvin [1]. At high densities cold collisions and chemical reactions can be studied, whereas the low velocities and long storage times permit high-resolution spectroscopy. Besides, these traps could form the starting point for a second cooling mechanism, such as evaporation, to bring molecules into the ultra-cold regime.
In previous experiments our group demonstrated filtering and trapping of slow polar molecules from an effusive source using an electrostatic guide and storage trap [2]. For ND3, trap densities up to 108 molecules/cm3 were obtained with a 130 ms life time.
Here, we investigate the trap losses of ND3 molecules due to
collisions with several room-temperature gases. A constant
background pressure in the trap environment is obtained by adding a
constant flow of gas with a needle valve. From the data taken at
several background pressures, cross sections are inferred. These can
be used to estimate collisional losses in future trap geometries or
in gaseous environments.
[1] J. Doyle, B. Friedrich, R.V. Krems and F. Masnou-Seeuws, European Physical Journal D 31, 149 (2004)
[2] T. Rieger, T. Junglen, S.A. Rangwala, P.W.H. Pinkse and G. Rempe, Physical Review Letters 95, 173002 (2005)