Details

Autor(en) / Beteiligte

• Dehn, M H
• Arseneau, D J
• Bridges, M D
• Buck, T
• Cortie, D L
• Cottrell, S P
• Fleming, D G
• Kelly, J A
• MacFarlane, W A
• MacLachlan, M J
• Morris, G D
• McKenzie, I
• Xiao, J
• Kiefl, R F

Titel

Spin Depolarization of Muonium in Mesoporous Silica

Ist Teil von

• Journal of physics. Conference series, 2014-01, Vol.551 (1), p.12006-5

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2014

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• We report muon spin rotation/relaxation measurements of muonium in mesoporous silica (SBA-15) with a high specific surface area of 600 m2/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.