Using polarized muons as ultrasensitive spin labels in free radical chemistry.
In a chemical sense, the positive muon is a light proton. It is obtained at the ports of accelerators in beams with a spin polarization of 100%, which makes it a highly sensitive probe of matter. The muonium atom is a light hydrogen isotope, nine times lighter than H, with a muon as its nucleus. It reacts the same way as H, and by addition to double bonds it is implemented in free radicals in which the muon serves as a fully polarized spin label. It is reviewed here how the muon can be used to obtain information about muonium and radical reaction rates, radical structure, dynamics, and local environments. It can even tell us what a fragrance molecule does in a shampoo.
ISIS Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK. iain.mckenzie@stfc.ac.uk
Iain
I
McKenzie
Emil
E
Roduner
D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D004583:Electrons; D005609:Free Radicals / Q000737:chemistry*; D007477:Ions; D008280:Magnetics; D008651:Mesons; D008956:Models, Chemical; D008970:Molecular Weight; D012399:Rotation; D012997:Solvents; D013057:Spectrum Analysis / Q000379:methods; D013113:Spin Labels
D005609:Free Radicals; D007477:Ions; D012997:Solvents; D013113:Spin Labels