title: Wall relaxation of 3He in spin-exchange cells.
abstract: The 3He longitudinal spin-relaxation rate T1-1 is crucial for production of highly polarized 3He by spin-exchange optical pumping. We show that T1-1 is increased by a factor of 2-20 solely by exposure of spin-exchange cells to a few-kG magnetic field. The original T1-1 can be restored by degaussing the cell. The effect is attributed to magnetic surface sites and has been observed in both Pyrex and aluminosilicate-glass cells. Our results both advance the understanding of wall relaxation and demonstrate the use of 3He as an extremely sensitive probe of surface magnetism.
authors.affiliation: Department of Physics, University of Utah, 115 South 1400 East, Salt Lake City, Utah 84112-0830, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Jacob
authors.forename: S W
authors.initials: SW
authors.lastname: Morgan
authors.forename: B
authors.initials: B
authors.lastname: Saam
authors.forename: J C
authors.initials: JC
authors.lastname: Leawoods