Article

Electron spin echo envelope modulation spectroscopy (ESEEM) of the radical cations of 14N and 15N bacteriochlorophyll a

Department of Biophysics, Huygens Laboratory of the State University, P.O. Box 9504, 2300 RA Leyden, The Netherlands; S.A. Dikanov,; A.V. Astashkin,; Yu.D. Tsvetkov; Institute of Chemical Kinetics and Combustion, Novosibirsk 630090, USSR
Chemical Physics Letters DOI:10.1016/0009-2614(85)85263-5 pp.40-47

ABSTRACT An electron spin echo envelope modulation frequency analysis is performed of the 14N and 15N bacteriochlorophyll a+ cation in solid solution. Hyperfine couplings of 2.0 and 3.1 MHz are derived which correspond to the perpendicular component of the axial hyperfine coupling tensor. Seven quadrupole frequencies were measured, six of which group in two sets of three zero-field quadrupole splittings.

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Keywords

15N bacteriochlorophyll a+ cation
 
echo envelope modulation frequency analysis
 
Hyperfine couplings
 
perpendicular component
 
zero-field quadrupole splittings