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National Biomedical Resource
for Advanced Electron Spin Resonance Spectroscopy

Our research is supported by grant 1R24GM146107 from the National Institute of General Medical Sciences (NIGMS), part of the National Institutes of Health.

  Key publications
HFHF ESR
Articles:

Study of paramagnetic defect centers in as-grown and annealed TiO2 anatase and rutile nanoparticles by a variable-temperature X-band and high-frequency (236 GHz) EPR
S. K. Misra, S. I. Andronenko, D. Tipikin, J. H. Freed, V. Somani, and O. Prakash.
J. Magn. Magn. Mater. 401, 495-505 (2016)
<doi:10.1016/j.jmmm.2015.10.072>
PMID: 27041794      PMCID: PMC4815036
 

Spin Labels in the Gel Phase and Frozen Lipid Bilayers: Do They Truly Manifest a Polarity Gradient?
B. Dzikowski and J.H. Freed.
In Nitroxides-Theory, Experiment and Applications; A. Kokorin. Ed.
InTech: Rijeka, Croatia, 2012; pp. 167-190.
<doi:10.5772/2887>
PMID: [None - Book]      PMCID: [None - Book]
 

The Internal Dynamics of Mini c TAR DNA Probed by Electron Paramagnetic Resonance of Nitroxide Spin-Labels at the Lower Stem, the Loop, and the Bulge
Y. Sun, Z. Zhang, V.M. Grigoryants, W.K. Myers, F. Liu, and K. Earle, J.H. Freed, C.P. Scholes
Biochemistry 51, 8530-8541 (2012).
Supporting Information
<doi:10.1021/bi301058q>
PMID: 23009298      PMCID: PMC3549007
 

Conformational Distributions and Hydrogen Bonding in Gel and Frozen Lipid Bilayers: A High Frequency Spin-Label ESR Study
B. Dzikovski, D. Tipikin, and J. Freed
J. Phys. Chem. B, 116, 6694-6706 (2012).
Supporting Information
<doi:10.1021/jp211879s>
PMID: 22324811      PMCID: PMC3376253
 

Molecular Motions
S.K. Misra and J.H. Freed.
In Multifrequency Electron Paramagnetic Resonance, S.K. Misra, Ed.
Wiley-VCH: New York, 2011; Chapter 11, pp. 497-544.
PMID: [None - Book]      PMCID: [None - Book]
 

Joint Analysis of ESR Lineshapes and 1H NMRD Profiles of DOTA-Gd Derivatives by Means of the Slow Motion Theory
D. Kruk, J. Kowalewski, D.S. Tipikin, J.H. Freed, M. Mościcki, A. Mielczarek, and M. Port.
J. Chem. Phys. 134, 024508 (2011).
<doi:10.1063/1.3516590>
PMID: 21241121      PMCID: PMC3188623
 

A Multifrequency EPR Study of Fe2+ and Mn2+ Ions in a ZnSiF6·6H2O Single Crystal at Liquid-Helium Temperatures
S.K. Misra, S. Diehl, D. Tipikin, J.H. Freed.
J. Magn. Res. 205, 14-22 (2010).
<doi:10.1016/j.jmr.2010.03.013>
PMID: 20395160      PMCID: PMC2885525
 

Multifrequency Electron Spin Resonance Study of the Dynamics of Spin Labeled T4 Lysozyme
Z. Zhang, M.R. Fleissner, D.S. Tipikin, Z. Liang, J.K. Moscicki, K.A. Earle, W.L. Hubbell, and J.H. Freed.
J. Phys. Chem. B, 114, 5503-5521 (2010).
Supporting Information
<doi:10.1021/jp910606h>
PMID: 20361789      PMCID: PMC2865245
 

Variable Coupling Scheme for High-Frequency Electron Spin Resonance Resonators Using Asymmetric Meshes
D.S. Tipikin, K.A. Earle and J.H. Freed.
Appl. Magn. Reson. 37, 819-832 (2010).
<doi:10.1007/s00723-009-0088-1>
PMID: 20458356      PMCID: PMC2865681
 

Multifrequency ESR Study of Spin-Labeled Molecules in Inclusion Compounds with Cyclodextrins
B. Dzikovski, D. Tipikin, V. Livshits, K.A. Earle and J.H. Freed.
Phys. Chem. Chem. Phys. 11, 6676-6688 (2009).
Supporting Information
<doi:10.1039/b903490k>
PMID: 19639141      PMCID: PMC2743463
 

A 236 GHz Fe3+ EPR Study of Nanoparticles of the Ferromagnetic Room-Temperature Semiconductor Sn1-xFexO2 (x = 0.005)
S.K. Misra, S.I. Andronenko, A. Punnoose, D. Tipikin, and J.H. Freed.
Appl. Magn. Reson. 36, 291-295 (2009).
<doi:10.1007/s00723-009-0024-4>
PMID: 20161547      PMCID: PMC2805097
 

High-Field ESR on Aligned Membranes: A Simple Method to Record Spectra from Different Membrane Orientations in the Magnetic Field
B. Dzikovski, K. Earle, S. Pachtchenko, J. Freed.
J. Magn. Reson. 179, 273-279 (2006).
<doi:10.1016/j.jmr.2005.12.015>
PMID: 16427793     
 

High-Frequency ESR at ACERT
K.A. Earle, B. Dzikovski, W. Hofbauer, J.K. Moscicki and J.H. Freed.
Magn. Reson. Chem. 43, S256-S266 (2005).
<doi:10.1002/mrc.1684>
PMID: 16235203     
 

A Variable Temperature EPR Study of Mn2+-doped NH4Cl0.9I0.1 Single Crystal at 170 GHz: Zero-Field Splitting Parameter and its Absolute Sign
S.K. Misra, S.I. Andronenko, P. Chand, K.A. Earle, S.V. Paschenko, J.H. Freed.
J. Magn. Reson. 174, 265-269 (2005).
<doi:10.1016/j.jmr.2005.02.015>
PMID: 15862243     
 

A Multifrequency Electron Spin Resonance Study of T4 Lysozyme Dynamics Using the Slowly Relaxing Local Structure Model
Z. Liang, Y. Lou, J.H. Freed, L. Columbus and W.L. Hubbell.
J. Phys. Chem. B 108, 17649-17659 (2004).
<doi:10.1021/jp0484837>
 

High-Power 95 GHz Pulsed Electron Spin Resonance Spectrometer
W. Hofbauer, K.A. Earle, C.R. Dunnam, J.K. Moscicki, and J.H. Freed.
Rev. Sci. Instrum. 75, 1194-1208 (2004).
<doi:10.1063/1.1710700>
 

Variable-Frequency EPR Study of Mn2+-Doped NH4Cl0.9I0.1 Single Crystal at 9.6, 36, and 249.9 GHz: Structural Phase Transition
S.K. Misra, S.I. Andronenko, G. Rinaldi, P. Chand, K.A. Earle, and J.H. Freed.
J. Magn. Reson. 160, 131-138, (2003).
<doi:10.1016/S1090-7807(02)00133-7>
PMID: 12615154     
 

Single-Crystal EPR Studies of Transition-Metal Ions in Inorganic Crystals at Very High Frequency
S.K. Misra, S.I. Andronenko, K.A. Earle, J.H. Freed.
Appl. Magn. Reson. 21, 549-561 (2001).
<doi:10.1007/BF03162428>
 

A Multifrequency ESR Study of the Complex Dynamics of Membranes
Y. Lou, M. Ge, and J.H. Freed.
J. Phys. Chem. B 105, 11053-11056 (2001).
<doi:10.1021/jp013226c>
 

Electron Spin Resonance in Studies of Membranes and Proteins
P.P. Borbat, A.J. Costa-Filho, K.A. Earle, J.K. Moscicki, J.H. Freed.
Science 291, 266-269, (2001).
<doi:10.1126/science.291.5502.266>
PMID: 11253218     
 

Quasioptical Hardware for a Flexible FIR-EPR Spectrometer
K.A. Earle and J.H. Freed.
Appl. Magn. Reson. 16, 247-272 (1999).
<doi:10.1007/BF03161937>
 

A "Shunt" Fabry-Perot Resonator for High-Frequency Electron Spin Resonance Utilizing a Variable Coupling Scheme
J.P. Barnes and J.H. Freed.
Rev. Sci. Instrum. 69, 3022-3027 (1998).
<doi:10.1063/1.1149050>
 

Millimeter Wave Electron Spin Resonance Using Quasioptical Techniques
K.A. Earle, D.E. Budil, and J.H. Freed.
Adv. Magn. Optical Reson. 19, 253-323 (1996).
<doi:10.1016/S1057-2732(96)80019-2>
 

Nanosecond RF Switch Driver
C. Dunnam.
Patent #5,214,315, May 25, 1993