Erratum to “Effects of cation siting and spin–spin interactions on the electron paramagnetic resonance (EPR) of Cu2+ exchanged X Faujasite zeolite” [Chem. Phys. 330 (2006) 401]

2009 ◽  
Vol 355 (2-3) ◽  
pp. 195 ◽  
Author(s):  
Chrispin O. Kowenje ◽  
Barry R. Jones ◽  
David C. Doetschman ◽  
Szu-Wei Yang ◽  
Charles W. Kanyi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Chem Phys ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Electron Paramagnetic ◽  
Faujasite Zeolite

Effects of cation siting and spin–spin interactions on the electron paramagnetic resonance (EPR) of Cu2+ exchanged X Faujasite zeolite

2006 ◽  
Vol 330 (3) ◽  
pp. 401-409 ◽  
Author(s):  
Chrispin O. Kowenje ◽  
Barry R. Jones ◽  
David C. Doetschman ◽  
Szu-Wei Yang ◽  
Charles W. Kanyi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Electron Paramagnetic ◽  
Faujasite Zeolite

Electron Paramagnetic Resonance Study of Single Crystals of Horse Heart Ferricytochrome c at 4.2 °K

1972 ◽  
Vol 50 (10) ◽  
pp. 1048-1055 ◽  
Author(s):  
Colin Mailer ◽  
C. P. S. Taylor
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Electron Paramagnetic Resonance Study ◽  
Field Potential ◽  
Personal Communication ◽  
Chem Phys ◽  
Paramagnetic Resonance ◽  
Ferricytochrome C ◽  
G Value ◽  
Electron Paramagnetic

Electron paramagnetic resonance (E.P.R.) spectra from single crystals of horse heart ferricytochrome c at 4.2 °K were analyzed to obtain the orientation of the principal g values relative to the crystallographic axes. The axis of the largest principal g value (g3 = 3.06) was within 5° of the heme normal direction reported in the X-ray structure of the same crystals (Dickerson et al.: J. Biol. Chem. 246, 1511 (1971)). The other two g axes (g1 = 1.25, g2 = 2.25) lie within 5° of the N–Fe–N directions in the heme ring, in contrast to met-myoglobin azide (Helcké et al.: Proc. R. Soc. B169, 275 (1968)) and cyanide (Blumberg, W. E.: personal communication) where they lie ~ 45° from the N–Fe–N directions. A version of Eisenberger and Pershan's theory (J. Chem. Phys. 47, 327 (1967)) was used to explain the 400–2000 G variation in linewidth on crystal rotation. The results were explained by combining the broadening produced by a distribution of rhombic crystal field potential (r.m.s. deviation 11%) over the molecular population, with that from a variation in the directions of the principal g values caused by misorientation (r.m.s. deviation 1.5°) of the molecules in the crystal.

Effects of Possible Spin-Spin Interactions on EPR spectra of Cu2+ exchanged Faujasite–X (I)

2005 ◽  
Vol 900 ◽  
Author(s):  
Chrispin B. O. Kowenje ◽  
Barry R. Jones ◽  
Charles W. Kanyi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Continuous Wave ◽  
Recent Literature ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Spin Interactions ◽  
Electron Paramagnetic

ABSTRACTThe interpretation of the continuous wave electron paramagnetic resonance (CW-EPR) spectra of Cu2+ exchanged in Faujasite zeolite is not straightforward. Recent literature points to the role of both Cu2+ zeolite sites and Cu2+ relationship to lattice Al in determining the parameters of Cu2+ spin Hamiltonian. Our work shows that at low concentration, Cu2+ EPR signals show negligible spin-spin interactions. At higher Cu (II) concentrations, a third CW-EPR spectrum that has contributions from both the CW-EPR and the spin-spin interactions, appears.

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