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Dipole-dipole interactions of high-spin paramagnetic centers in disordered systems

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Abstract

Dipole-dipole interactions between distant paramagnetic centers (PCs) where at least one PC has spinS>1/2 are examined. The results provide a basis for the application of pulsed electron-electron double resonance method to the measurement of distances between PCs involving high-spin species. A projection operator technique based on spectral decomposition of the secular Hamiltonian is used to calculate electron paramagnetic resonance (EPR) line splitting caused by the dipole coupling. This allows calculation of operators projecting an arbitrary wave function onto high-spin PC eigenstates when the eigenvectors of the Hamiltonian are not known. The effective spin vectors — that is, the expectation values for vector spin operators in the PC eigenstates — are calculated. The dependence of these effective spin vectors on the external magnetic field is calculated. There is a qualitative difference between pairs having at least one integer spin (non-Kramers PC) and pairs of two half-integer (Kramers PC) spins. With the help of these effective spin vectors, the dipolar line shape of EPR lines is calculated. Analytical relations are obtained for PCs with spinS=1/2 and 1. The dependence of Pake patterns on variations of zero-field splitting, Zeeman energy, temperature and dipolar coupling are illustrated.

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Authors and Affiliations

  1. Institute of Chemical Kinetics and Combustion, Russian Academy of Sciences, Institutskaya ulitsa 3, 630090, Novosibirsk, Russian Federation

    A. G. Maryasov & Yu. D. Tsvetkov

  2. Structural Biology and Microimaging, Battelle Northwest, Richland, Washington, USA

    M. K. Bowman

Authors
  1. A. G. Maryasov
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  2. M. K. Bowman
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  3. Yu. D. Tsvetkov
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Correspondence to A. G. Maryasov.

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Maryasov, A.G., Bowman, M.K. & Tsvetkov, Y.D. Dipole-dipole interactions of high-spin paramagnetic centers in disordered systems. Appl. Magn. Reson. 30, 683–702 (2006). https://doi.org/10.1007/BF03166227

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