Surface Adsorbed Free Radicals Observed by Positive Muon Avoided Level Crossing Resonance

  • Emil Roduner
  • Ivan D. Reid
Conference paper


Cyclohexadienyl type radicals are produced by positive muon irradiation of benzene adsorbed at the surface of silica. They contain the muon as a polarized spin label. Cross relaxation effects are observed when a longitudinal magnetic field is scanned through regions of avoided crossings of magnetic energy levels. This permitts the identification of the radicals and the study of surface motional dynamics. Complete randomisation of orientations on a timescale of 10 ns is ascribed to translational diffusion around the grains.

PACS numbers

82.65.Yh 76.30.Rn 76.75.+i 


  1. [1]
    E. Roduner, The Positive Muon as a Probe in Free Radical Chemistry; Lecture Notes in Chemistry 49; Springer-Verlag: Berlin, 1988CrossRefGoogle Scholar
  2. [2).
    E. Roduner, I.D. Reid, M. Riccé and R. De Renzi, Ber. Bunsenges. Phys. Chem. 93 (1989) 1194–1197.CrossRefGoogle Scholar
  3. [3]
    I.D. Reid, T. Azuma and E. Roduner, Nature, in press.Google Scholar
  4. [4]
    E. Roduner, Chimia 43 (1989) 86–97.Google Scholar
  5. [5]
    M. Heming, et al. Chem. Phys. 129 (1989) 335–350.ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • Emil Roduner
    • 1
  • Ivan D. Reid
    • 1
    • 2
  1. 1.Physikalisch-Chemisches InstitutUniversität ZürichZürichSwitzerland
  2. 2.Paul Scherrer InstituteVilligen PSISwitzerland

Personalised recommendations