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