The g = 2 multiline EPR signal of the S2 state of the photosynthetic oxygen-evolving complex originates from a ground spin state.
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.
Britt
R D
RD
Department of Chemistry, University of California, Davis 95616.
Lorigan
G A
GA
Sauer
K
K
Klein
M P
MP
Zimmermann
J L
JL
D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D010100:Oxygen / Q000737:chemistry*; D010788:Photosynthesis; D013696:Temperature
D010100:Oxygen