ELECTRON SPIN RESONANCE OF X-RAY-IRRADIATED SINGLE CRYSTALS OF dl-ALANINE HYDROCHLORIDE

1962 ◽  
Vol 40 (6) ◽  
pp. 1060-1063 ◽  
Author(s):  
W. C. Lin ◽  
C. A. McDowell
Keyword(s):  
Electron Spin Resonance ◽  
Hyperfine Interaction ◽  
Single Crystal ◽  
Single Crystals ◽  
Electron Spin ◽  
X Ray ◽  
Spin Resonance ◽  
Interaction Tensor ◽  
Γ Ray

The electron spin resonance of an X-ray-irradiated single crystal of dl-alanine hydrochloride indicates that the radical formed is probably the same as that produced by X- and γ-ray irradiation of alanine. The components of the hyperfine interaction tensor for the radical have been evaluated.

ELECTRON SPIN RESONANCE OF AN X-RAY IRRADIATED SINGLE CRYSTAL OF DIKETOPIPERAZINE

1963 ◽  
Vol 41 (1) ◽  
pp. 9-13 ◽  
Author(s):  
W. C. Lin ◽  
C. A. McDowell
Keyword(s):  
Magnetic Field ◽  
Electron Spin Resonance ◽  
Hydrogen Atom ◽  
Hyperfine Interaction ◽  
Single Crystal ◽  
Electron Spin ◽  
X Ray ◽  
Spin Resonance ◽  
Interaction Tensor ◽  
Γ Ray

The electron spin resonance of an X-ray irradiated single crystal of diketopiperazine has been measured at 9 Gc/sec for various orientations of the crystal in the static magnetic field. From an analysis of the hyperfine structure observed we have been able to calculate the components of the hyperfine interaction tensor for the radical produced by the irradiation. The principal values for the hyperfine interaction tensor are similar to those found for the radical produced by the X-ray or γ-ray irradiation of glycylglycine and N-acetylglycine and is therefore attributed to a radical with a C—H fragment. The fine details of the spectrum indicate that the radical responsible for the electron resonance observed probably has the structure [Formula: see text]which is formed from diketopiperazine by the loss of a hydrogen atom from one of the CH2 groups in that molecule.

Electron spin resonance of an X-ray irradiated single crystal of potassium dihydrogen arsenate, KH2AsO4

1966 ◽  
Vol 10 (6) ◽  
pp. 565-573 ◽  
Author(s):  
Marlene Hampton ◽  
F.G. Herring ◽  
W.C. Lin ◽  
C.A. McDowell
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystal ◽  
Electron Spin ◽  
Potassium Dihydrogen ◽  
X Ray ◽  
Spin Resonance

Electron spin resonance of X-ray irradiated single crystals of ammonium paramolybdate tetrahydrate

1968 ◽  
Vol 15 (3) ◽  
pp. 239-248 ◽  
Author(s):  
C.R. Byfleet ◽  
F.G. Herring ◽  
W.C. Lin ◽  
C.A. McDowell ◽  
D.J. Ward
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystals ◽  
Electron Spin ◽  
Ammonium Paramolybdate ◽  
X Ray ◽  
Spin Resonance

A single crystal X-ray and electron spin resonance study of the 5-nitro-1,1,3,3-tetramethylisoindolin-2-yloxyl free radical

1996 ◽  
Vol 375 (1-2) ◽  
pp. 105-115 ◽  
Author(s):  
Shirley A. Fairhurst ◽  
Duncan G. Gillies ◽  
Glen W. Smith ◽  
Leslie H. Sutcliffe ◽  
Xiaoping Wu
Keyword(s):  
Electron Spin Resonance ◽  
Free Radical ◽  
Single Crystal ◽  
Electron Spin ◽  
Electron Spin Resonance Study ◽  
X Ray ◽  
Spin Resonance ◽  
Spin Resonance Study

Matrix dependence of the electron spin resonance spectra of the radical trapped in different single crystals

1977 ◽  
Vol 55 (20) ◽  
pp. 3554-3558 ◽  
Author(s):  
J. P. Michaut ◽  
J. Roncin
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystal ◽  
Single Crystals ◽  
Electron Spin ◽  
Experimental Error ◽  
Field Effect ◽  
Coupling Constants ◽  
Crystal Field Effect ◽  
Proton Coupling ◽  
Spin Resonance

Nitrogen and proton coupling tensors have been measured for the [Formula: see text] radical trapped in five different single crystal matrices. As all isotropic coupling constants are the same within experimental error (aN = 21.2 G, aH = 28.4 G), no measurable crystal field effect is found. In these solids the motions of the radical depend on the dimension of the trapping cage and the motions of the surrounding molecules.

E.S.R. Studies of γ-Ray Irradiated Single Crystals of D-Tartaric Acid

1972 ◽  
Vol 50 (22) ◽  
pp. 3706-3713 ◽  
Author(s):  
J. K. Mulchinock ◽  
F. R. Hallett ◽  
F. C. Adam
Keyword(s):  
Electron Spin Resonance ◽  
Single Crystals ◽  
Tartaric Acid ◽  
Electron Spin ◽  
Unit Cell ◽  
Acid System ◽  
Radical Production ◽  
Spin Resonance ◽  
Γ Ray ◽  
And Migration

Electron spin resonance (e.s.r.) studies on single crystals of normal and deuterated D-tartaric acid have been carried out as part of a larger investigation of radical production and migration in biologically related single crystals. The D-tartaric acid system is especially interesting since the second and third carbon atoms of the molecule, which are chemically identical in solution, become conformationally non-equivalent in the unit cell. The effects of this conformational difference on the e.s.r. spectra are discussed. The radicals identified in this study are consistent with the work of others on similar systems.

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