Theoretical and Experimental Chemistry

, Volume 22, Issue 3, pp 313–319 | Cite as

Analysis of the anisotropy of the rotation of spin probes according to saturation-transfer ESR spectra

  • V. A. Livshits
  • Yu. A. Bobrov


Expressions for calculating the form of the second-harmonic ESR absorption spectra for the cases of discontinuous isotropic and uniaxial rotation of a spin probe around the principal axes of the magnetic tensors have been obtained. In the case of a macroscopically unoriented system, the form of the spectrum in the second harmonic shows little sensitivity to rotational anisotropy, which can be established on the basis of the spectroscopic parameters L″/L, C′/C, and H″/H only in a restricted number of ceases. The relations between the correlation times determined from these parameters in the model of isotropic rotation and their relationship to the true values of τ in the case of uniaxial rotation of the probe have been analyzed. With respect to oriented sytems, the calculated spectra have been compared with the experimental spectra for a cholestane spin probe in phospholipid multilayers. Consideration of the inhomogeneous broadening of the line is necessary in order to achieve satisfactory agreement.


Anisotropy Correlation Time Experimental Spectrum Satisfactory Agreement Isotropic Rotation 
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Copyright information

© Plenum Publishing Corporation 1986

Authors and Affiliations

  • V. A. Livshits
    • 1
  • Yu. A. Bobrov
    • 1
  1. 1.Institute of Chemical PhysicsAcademy of Sciences of the USSRMoscow

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