Magnetic circular dichroism anisotropy from coherent Raman detected electron paramagnetic resonance spectroscopy: Application to spin-1/2 transition metal ion centers in proteins

Measurement of magnetic circular dichroism (MCD) anisotropy has contributed greatly to the understanding of the electronic structure of transition met al ion centers in both biological and nonbiological materials. Compared to previous methods, optically detected electron paramagnetic resonance experi ments can measure MCD anisotropy with dramatically improved orientational r esolution. In this paper the relevant theory for systems with an isolated K ramers doublet ground level is derived and its application illustrated usin g a transition metal ion center in a protein: low spin ferric haem. (C) 200 0 American Institute of Physics. [S0021-9606(00)00634-6].