Theory of the Temperature Dependences of the Hyperfine Interactions in the Methyl Radical

1967 ◽  
Vol 46 (10) ◽  
pp. 3895-3904 ◽  
Author(s):  
David M. Schrader
Keyword(s):  
Hyperfine Interactions ◽  
Methyl Radical ◽  
Temperature Dependences

FORMATION OF THE CHARGE DENSITY WAVES IN THE β-TYPE OXIDE VANADIUM BRONZES NaxV2O5

1992 ◽  
Vol 06 (09) ◽  
pp. 1491-1503 ◽  
Author(s):  
A.V. DMITRIEV ◽  
N.A. ZHURAVLEV ◽  
V.L. VOLKOV
Keyword(s):  
Phase Transition ◽  
Charge Density ◽  
Hyperfine Interactions ◽  
Density Wave ◽  
Charge Density Waves ◽  
Joint Analysis ◽  
Gap Formation ◽  
Temperature Dependences ◽  
Wave Development ◽  
A Charge

NMR of 51 V and 27 Na in monocrystals β- Na x V 2O5(x=0.22, 0.27, 0.33) has been studied between 80 K and 400 K. Temperature dependences of hyperfine interactions have been investigated. In all compositions under study, a phase transition has been observed, its temperature has decreased with a reducing natrium content. A joint analysis of magnetic susceptibilities and resonance shifts showed that the phase transition has been connected with a gap formation at the Fermi level. Investigations of quadrupole effects and electroconductivities allowed to establish that the phase transition has been accompanied by a charge density wave development. On the basis of NMR measurements, an electron localization region has been evaluated. The results have been compared with electrophysical data.

Conformation and Mobility of Radicals in Heterogeneous Systems ESR Spectra at 4K of Methyl, Ethyl, n-Propyl and Allyl Radicals Adsorbed on Silica Gel

1974 ◽  
Vol 29 (4) ◽  
pp. 653-659 ◽  
Author(s):  
Tetsuo Shiga ◽  
Hitoshi Yamaoka ◽  
Anders Lund
Keyword(s):  
Silica Gel ◽  
Hyperfine Coupling ◽  
Hyperfine Interactions ◽  
Heterogeneous Systems ◽  
Esr Spectra ◽  
Methyl Ethyl ◽  
Methyl Radical ◽  
Threefold Axis ◽  
Rigid Conformation ◽  
Ethyl Radicals

ESR spectra of the methyl, ethyl, n-propyl and allyl radicals adsorbed on silica gel were analysed in terms of g-factor and hyperfine coupling anisotropies. The magnitudes of the anisotropies demonstrate that at 4 K the methyl radical reorients about its threefold axis, and the ethyl radical reorients about the C -C-bond axis. The experimental data for the methyl and ethyl radicals have been combined to yield the dipolar hyperfine coupling for an α-proton. The constants thus derived are Bx=12.5G , By= -13.0 G and B2= 0.5 G. The n-propyl radical has a rigid conformation at 4 K with a spectrum which arises by the hyperfine interactions of two α protons and two β protons. The β protons have aβ1 = 40 G and aβ2 = 22 G, which is indicative of an asymmetric conformation. The allyl radical at 4 K also gives the rigid limit spectrum. The temperature dependence of the spectra was studied in the range 4K - 183K.

ELECTRIC HYPERFINE INTERACTIONS OF IRON IN DIMERIC STATE IN METALS

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-576-C2-578 ◽  
Author(s):  
B. D. Sawicka ◽  
J. A. Sawicki
Keyword(s):  
Hyperfine Interactions

HYPERFINE INTERACTIONS IN DyFe2

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-199-C1-200 ◽  
Author(s):  
St. Japa ◽  
K. Krop ◽  
M. Przybylski
Keyword(s):  
Hyperfine Interactions
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