|Title||Interaction of NH(X (3)Sigma(-)) with He: Potential energy surface, bound states, and collisional Zeeman relaxation|
|Publication Type||Journal Article|
|Year of Publication||2005|
|Authors||Cybulski, H, Krems, RV, Sadeghpour, HR, Dalgarno, A, Klos, J, Groenenboom, GC, van der Avoird, A, Zgid, D, Chalasinski, G|
|Journal||JOURNAL OF CHEMICAL PHYSICS|
|Date Published||MAR 1|
A detailed analysis of the He-NH((3)Sigma(-)) van der Waals complex is presented. We discuss ab initio calculations of the potential energy surface and fitting procedures with relevance to cold collisions, and we present accurate calculations of bound energy levels of the triatomic complex as well as collisional properties of NH molecules in a buffer gas of He-3. The influence of the external magnetic field used to trap the NH molecules and the effect of the atom-molecule interaction potential on the collisionally induced Zeeman relaxation are explored. It is shown that minute variations of the interaction potential due to different fitting procedures may alter the Zeeman relaxation rate at ultralow temperatures by as much as 50%. (C) 2005 American Institute of Physics.