Interdoublet transitions in S = 5/2 protein systems.
Beginning with known parameters that characterize the EMR spectra of several proteins containing high-spin ferric iron, the information content of the spectra has been examined by simulations that cover a range of magnetic fields and frequencies. Transitions between levels that are not Kramers doublet levels are particularly interesting when the applied frequency is approximately two to three times the value of the zero-field splitting parameter, D. In these cases, transitions at very low magnetic fields correspond to portions of interdoublet transitions that are well separated from all other transitions. The magnetic field is aligned at angles between the molecular principal axes for the portion of the molecules giving rise to the low-field interdoublet transitions. This provides an opportunity for unique angle-selection experiments.
Maguire
B C
BC
National High Magnetic Field Laboratory, Florida State University, Tallahassee 32306, USA.
Gaffney
B J
BJ
D004578:Electron Spin Resonance Spectroscopy; D005290:Ferric Compounds / Q000737:chemistry*; D006801:Humans; D011506:Proteins / Q000737:chemistry*
D005290:Ferric Compounds; D011506:Proteins