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. 1992 Nov 16;1140(1):95-101.
doi: 10.1016/0005-2728(92)90024-v.

The g = 2 multiline EPR signal of the S2 state of the photosynthetic oxygen-evolving complex originates from a ground spin state

R D Britt  1 , G A Lorigan, K Sauer, M P Klein, J L Zimmermann
Affiliations

The g = 2 multiline EPR signal of the S2 state of the photosynthetic oxygen-evolving complex originates from a ground spin state

R D Britt et al. Biochim Biophys Acta. .

Abstract

The amplitude of the g = 2 Mn 'multiline' EPR signal of the S2 state of the photosynthetic oxygen-evolving complex varies inversely with temperature, indicating that this signal arises from a ground spin state. Electron spin echo experiments at temperatures of 4.2 K and 1.4 K show such Curie-law behavior of the g = 2 multiline EPR signal, as do continuous-wave EPR experiments performed at a non-saturating microwave power in the range from 15.0 K to 4.2 K.

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