Details

Autor(en) / Beteiligte

• Rhodes, Christopher J.
• Dintinger, Timothy C.
• Reid, Ivan D.
• Scott, Christopher A.

Titel

Mobility of dichloroethyl radicals sorbed in kaolin and silica: a potential model of heterogeneous atmospheric processes

Ist Teil von

• Magnetic resonance in chemistry, 2000-04, Vol.38 (4), p.281-287

Ort / Verlag

Chichester, UK: John Wiley & Sons, Ltd

Erscheinungsjahr

2000

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• An activation energy of 10.6 ± 1.4 kJ mol−1 was determined for the reorientational diffusion of 1,1‐dichloroethyl radicals sorbed in silica gel by transverse‐field muon spin rotation (TF‐MuSR) spectroscopy, and was confirmed by longitudinal‐field muon spin relaxation (LF‐MuSRx) measurements, which gave a value of 10.9 ± 0.7 kJ mol−1. Also according to TF‐MuSR measurements, the activation energy for this radical sorbed in kaolin powder is 11.0 ± 1.3 kJ mol−1, which was within experimental error of that obtained from an LF‐MuSRx study (12.3 ± 0.8 kJ mol−1). The LF‐MuSRx method also revealed the presence of an additional, more mobile, fraction of 1,1‐dichloroethyl radicals in both silica and kaolin with activation energies of 2.6 ± 0.4 and 2.4 ± 0.2 kJ mol−1, respectively. Copyright © 2000 John Wiley & Sons, Ltd.