|Title||Spin Depolarization of Muonium in Mesoporous Silica|
|Publication Type||Conference Paper|
|Year of Publication||2014|
|Authors||Dehn, MH, Arseneau, DJ, Bridges, MD, Buck, T, Cortie, DL, Cottrell, SP, Fleming, DG, Kelly, JA, MacFarlane, WA, MacLachlan, MJ, Morris, GD, McKenzie, I, Xiao, J, Kiefl, RF|
|Editor||Salman, Z, Amato, A, Luetkens, H, Morenzoni, E|
|Conference Name||13TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE|
|Publisher||Paul Scherrer Inst, Lab Muon Spin Spectroscopy; Univ Zurich; Univ Fribourg; Swiss Natl Fdn; Costruzioni Apparecchiature Elettroniche Nucleari S p A; X TRONIX AG; BlueFors Cryogen Oy Ltd; TECO Rene Koch; Teledyne LeCroy SA|
We report muon spin rotation/relaxation measurements of muonium in mesoporous silica (SBA-15) with a high specific surface area of 600 m(2)/g. Up to 70 percent of the incoming muons form muonium and escape efficiently into the open pores at all temperatures between 3 and 300K. We present evidence that the interaction with the silica surfaces involves both spin exchange and a transition to a diamagnetic state, possibly due to dangling bonds on the surface. At very low temperatures, below 20K, the interaction between muonium and the silica surfaces is suppressed due to a He film coating the surfaces. These results indicate that it should be possible to use muonium to probe the surfaces of uncapped nanoparticles supported in silica.