Session T1: Poster Session III (4:00 pm - 6:00 pm)
4:00 PM–4:00 PM, Friday, May 28, 2010
Room: Exhibit Hall
Abstract ID: BAPS.2010.DAMOP.T1.123
Abstract: T1.00123 : Ultracold NH-NH collisions in magnetic fields
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Abstract 
Authors:
Gerrit Groenenboom
(Radboud University Nijmegen)
Liesbeth Janssen
(Radboud University Nijmegen)
Ad van der Avoird
(Radboud University Nijmegen)
Piotr Zuchowski
(Durham University)
Jeremy Hutson
(Durham University)
The production of cold and ultracold molecules opens up the possibility to control chemical reactions by means of electromagnetic fields. The NH ($^3\Sigma^-$) molecule is a promising candidate for cold controlled chemistry, due to its large electric and magnetic dipole moment. We constructed high level, {\em ab initio}, singlet, triplet, and quintet interaction potentials, with analytic longe expansions for the entrance channel for chemical reaction [1]. We present preliminary quantum scattering calculations of the elastic and Zeeman relaxation cross sections from the cold (1K) down to the ultracold ($10^{-8}$ K) regime in magnetic fields ranging from $10^{-4}$ to $10^4$ gauss. We also investigate the effect of the intra- and inter-molecular spin-spin interactions. A large number of resonances over many orders of magnitude are found in elastic and inelastic cross sections. \\[4pt] [1] Liesbeth M. C. Janssen, Gerrit C. Groenenboom, Ad van der Avoird, Piotr S.~\.{Z}uchowski, and Rafa{\l} Podeszwa, J. Chem. Phys. {\bf 131}, 224314 (2009).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.DAMOP.T1.123