Spin Mixing and Magnetic Circular Dichroism in the Absorption Band ofFCenters-A Theoretical Investigation of Electron-Spin Memory

1972 ◽  
Vol 6 (3) ◽  
pp. 787-797 ◽  
Author(s):  
A. Winnacker ◽  
L. F. Mollenauer
Keyword(s):  
Circular Dichroism ◽  
Absorption Band ◽  
Theoretical Investigation ◽  
Electron Spin ◽  
Magnetic Circular Dichroism ◽  
Circular Dichroïsm

Coherent Raman detected electron spin resonance spectroscopy of metalloproteins: linking electron spin resonance and magnetic circular dichroism

2008 ◽  
Vol 36 (6) ◽  
pp. 1187-1190 ◽  
Author(s):  
Stephen J. Bingham ◽  
Daniel Wolverson ◽  
Andrew J. Thomson
Keyword(s):  
Circular Dichroism ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Metal Ion ◽  
Magnetic Circular Dichroism ◽  
Microwave Frequency ◽  
Resonance Spectroscopy ◽  
Spin Resonance ◽  
Coherent Raman ◽  
Circular Dichroïsm

The simultaneous excitation of paramagnetic molecules with optical (laser) and microwave radiation in the presence of a magnetic field can cause an amplitude, or phase, modulation of the transmitted light at the microwave frequency. The detection of this modulation indicates the presence of coupled optical and ESR transitions. The phenomenon can be viewed as a coherent Raman effect or, in most cases, as a microwave frequency modulation of the magnetic circular dichroism by the precessing magnetization. By allowing the optical and magnetic properties of a transition metal ion centre to be correlated, it becomes possible to deconvolute the overlapping optical or ESR spectra of multiple centres in a protein or of multiple chemical forms of a particular centre. The same correlation capability also allows the relative orientation of the magnetic and optical anisotropies of each species to be measured, even when the species cannot be obtained in a crystalline form. Such measurements provide constraints on electronic structure calculations. The capabilities of the method are illustrated by data from the dimeric mixed-valence CuA centre of nitrous oxide reductase (N2OR) from Paracoccus pantotrophus.

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