title: Interaction of NH(X 3Sigma-) with He: potential energy surface, bound states, and collisional Zeeman relaxation.
abstract: 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 (3)He. 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%.
authors.affiliation: Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warszawa, Poland.
authors.forename: H
authors.initials: H
authors.lastname: Cybulski
authors.forename: R V
authors.initials: RV
authors.lastname: Krems
authors.forename: H R
authors.initials: HR
authors.lastname: Sadeghpour
authors.forename: A
authors.initials: A
authors.lastname: Dalgarno
authors.forename: J
authors.initials: J
authors.lastname: Kłos
authors.forename: G C
authors.initials: GC
authors.lastname: Groenenboom
authors.forename: A
authors.initials: A
authors.lastname: van der Avoird
authors.forename: D
authors.initials: D
authors.lastname: Zgid
authors.forename: G
authors.initials: G
authors.lastname: Chałasiński