title: Muonium analog of hydrogen passivation: observation of the Mu+-Zn- reaction in GaAs.
abstract: We report direct detection of the formation and subsequent breakup of a complex containing positively charged muonium ( Mu+) and a substitutional Zn(Ga) acceptor in heavily doped p-type GaAs:Zn. Mu+ diffuses above 200 K with a hop rate nu = nu(0)e(-E(nu)/k(B)T) where nu(0) = (7.7+/-2.0)x10(8) s(-1) and E(nu) = 0.15(4) eV. Above 350 K, it forms the complex with a trapping radius of 500+/-200 A. The Mu-Zn complex breaks up above 550 K with a dissociation energy of 0.88(7) eV and prefactor of (5+/-4)x10(12) s(-1). Above 750 K, the cyclic reaction Mu+<--> Mu0 takes place.
authors.affiliation: Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1.
authors.forename: K H
authors.initials: KH
authors.lastname: Chow
authors.forename: B
authors.initials: B
authors.lastname: Hitti
authors.forename: R F
authors.initials: RF
authors.lastname: Kiefl
authors.forename: R L
authors.initials: RL
authors.lastname: Lichti
authors.forename: T L
authors.initials: TL
authors.lastname: Estle