Düsseldorf 2007 – wissenschaftliches Programm

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SYMC: Symposium Molecular Collisions at ultracold temperatures

SYMC 2: Molecular collisions at ultracold temperatures II

SYMC 2.3: Hauptvortrag

Montag, 19. März 2007, 17:30–18:00, 5D

Controlled Xe-OH collisions and the OH(v=1) radiative lifetime — •Gerrit Groenenboom — Theoretical Chemistry, Institute for Molecules and Materials, Radboud University Nijmegen, Toernooiveld 1, 6525ED Nijmegen, The Netherlands

Beams of polar molecules can be produced with very well controlled velocities with the Stark deceleration technique developed by Gerard Meijer and coworkers. In a recent proof-of-principle experiment this was used to study collisions of Xe with Stark controlled OH in the 50-400 wavenumber region [1]. Inelastic cross sections were determined for several rotational and spin orbit inelastic transitions. I will present calculated Xe-OH potential energy surfaces, theoretical cross sections, and the comparison with experiment.

In earlier work Stark decelerated OH was loaded into an electrostatic quadrupole trap. The long observation time in the trap made it possible to measure the radiative lifetime, which was found to be 59 +/- 2 ms., in excellent agreement with our calculations [2]. I will present new results for the OH Meinel system [3].

[1] J. J. Gilijamse, S. Hoekstra, S. Y. T. van de Meerakker, G. C. Groenenboom, and G. Meijer, Science, 313, 1617 (2006)

[2] S. Y. T. van de Meerakker, N. Vanhaecke, M. P. J. van der Loo, G. C. Groenenboom, and G. Meijer, Phys. Rev. Lett., 95, 013003 (2005).

[3] Mark P. J. van der Loo and Gerrit C. Groenenboom, J. Chem. Phys., accepted (2007).