Mobility of dichloroethyl radicals sorbed in kaolin and silica: a potential model of heterogeneous atmospheric processes
✍ Scribed by Christopher J. Rhodes; Timothy C. Dintinger; Ivan D. Reid; Christopher A. Scott
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 107 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0749-1581
No coin nor oath required. For personal study only.
✦ Synopsis
An activation energy of 10.6 š 1.4 kJ mol 1 was determined for the reorientational diffusion of 1,1dichloroethyl 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 š 0.7 kJ mol 1 . Also according to TF-MuSR measurements, the activation energy for this radical sorbed in kaolin powder is 11.0 š 1.3 kJ mol 1 , which was within experimental error of that obtained from an LF-MuSRx study (12.3 š 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 š 0.4 and 2.4 š 0.2 kJ mol 1 , respectively.