3 mm EPR investigation of the primary donor cation radical in single crystals of Rhodobacter sphaeroides R-26 reaction centers

The EPR g-factor rotation pattern of the primary donor cation radical ▪ in the x y plane of illuminated reaction center single crystals of Rb. sphaeroides R-26 near room temperature was measured at 3 mm wavelength (W-band, 95 GHz). In contrast to earlier X-band (9.5 GHz) EPR experiments, the two ma...

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Bibliographic Details
Published in:Chemical physics letters 1991-10, Vol.185 (3), p.381-386
Main Authors: Burghaus, O., Plato, M., Bumann, D., Neumann, B., Lubitz, W., Möbius, K.
Format: Article
Language:English
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Summary:The EPR g-factor rotation pattern of the primary donor cation radical ▪ in the x y plane of illuminated reaction center single crystals of Rb. sphaeroides R-26 near room temperature was measured at 3 mm wavelength (W-band, 95 GHz). In contrast to earlier X-band (9.5 GHz) EPR experiments, the two magnetically inequivalent sites of the four reaction centers per unit cell were well resolved. ▪ in frozen reaction center solution was also measured by 3 mm EPR. The analysis of both the frozen-solution spectrum and the single-crystal rotation pattern yields the principal values of the g-tensor and the phase angle between the two magnetically inequivalent sites in the x y plane.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(91)85079-C