Krems, R. V.Dalgarno, A.2019-09-272003Krems, R. V., and A. Dalgarno. 2003. “Disalignment Transitions in Cold Collisions of3Patoms with Structureless Targets in a Magnetic Field.” Physical Review A 68 (1). https://doi.org/10.1103/physreva.68.013406.1050-29471094-1622http://nrs.harvard.edu/urn-3:HUL.InstRepos:41417414A method for quantum-mechanical calculations of cross sections for the Zeeman transitions in collisions of P-3 atoms with structureless targets in a magnetic field is presented and applied to the study of magnetic and electronic relaxation in oxygen-helium and carbon-helium collisions at cold and ultracold temperatures. The rate constants for collisionally induced transitions between Zeeman levels in ground-state oxygen have large magnitudes in a 1 T field. It is shown that magnetic fields induce the forbidden P-3(1) --> P-3(0) transition in ultracold collisions of carbon with helium. The cross section vanishes at zero energy for field-free collisions, but becomes infinitely large in a finite magnetic field, varying with velocity v and magnetic field B as B-2/v.en-USJournal Article2019-09-2710.1103/PhysRevA.68.013406