Isotope Effect on The Electronic Structure of Hydrogen in Metals

1980 ◽  
Vol 3 ◽  
Author(s):  
P. Jena ◽  
C. B. Satterthwaite
Keyword(s):  
Electronic Structure ◽  
Spin Density ◽  
Isotope Effect ◽  
Hyperfine Coupling ◽  
Magnetic Hyperfine ◽  
Electron Charge ◽  
Hydrogen Impurity ◽  
Thermally Induced ◽  
Hydrogen In Metals ◽  
Hydrogen Nucleus

ABSTRACTThe effect of the isotopic mass on the redistribution of electron charge and spin density around a light impurity such as hydrogen in metals has been studied. Considered in this review are: (a) the magnetic hyperfine coupling to the hydrogen nucleus and the effect of isotopic mass, (b) the isotope effect in hydrogen impurity resistivity, (c) the reverse isotope effect in superconducting PdH(D) and (d) the thermally induced detrapping of hydrogen from the vicinity of solute sites in metallic hosts.

Electronic Structure of Pseudotetrahedral Copper(II) Schiff Base Complexes

1977 ◽  
Vol 32 (5) ◽  
pp. 551-561 ◽  
Author(s):  
John R. Wasson ◽  
H. Wayne Richardson ◽  
William E. Hatfield
Keyword(s):  
Electronic Structure ◽  
Schiff Base ◽  
Schiff Bases ◽  
Opposite Direction ◽  
Hyperfine Coupling ◽  
Coupling Constants ◽  
Schiff Base Complexes ◽  
Hyperfine Coupling Constants ◽  
Structure Correlations

Copper(II) complexes with the Schiff bases formed by condensing t-butyl-, isopropyl-, cyclohexyl- and diphenylmethylamines with salicylaldehyde and 3-methoxy- and 5-nitrosalicyl-aldehyde have been prepared and characterized. The isotropic nuclear hyperfine coupling constants increase in the order t-butyl < isopropyl < cyclohexyl < diphenylmethyl for the N-substituents in the three series of complexes while isotropic g-values increased in the opposite direction. Spectra structure correlations were examined and discussed.

Spin density and manganese electronic structure in phthalocyaninatomanganese(II)

1981 ◽  
pp. 1837 ◽  
Author(s):  
Brian N. Figgis ◽  
Geoffrey A. Williams ◽  
J. Bruce Forsyth ◽  
Ronald Mason
Keyword(s):  
Electronic Structure ◽  
Spin Density

Notizen: 13C-NMR an paramagnetischen Phenylmetallocenen1: Analogie zum Benzylradikal.

1976 ◽  
Vol 31 (8) ◽  
pp. 1153-1154 ◽  
Author(s):  
Frank H. Köhler ◽  
G. Matsubayashi
Keyword(s):  
Density Distribution ◽  
Spin Density ◽  
13C Nmr ◽  
Nmr Spectra ◽  
Hyperfine Coupling ◽  
Spin Density Distribution ◽  
Coupling Constants ◽  
Methyl Radicals ◽  
Benzyl Radical ◽  
C Nmr

The 13C NMR spectra of seven phenylated paramagnetic metallocenes have been recorded. From the spectra the 13C hyperfine coupling constants A(13C) have been extracted and compared with corresponding A(1H). It is found that the phenyl A′s in nickelocenes and cobaltocenes behave as in benzyl radical being reduced by a factor of 27. This offers a new route to informations about spin density distribution in substituted methyl radicals.

Electronic structure of Ni-Cu alloys: Thed-electron charge distribution

1998 ◽  
Vol 57 (24) ◽  
pp. 15204-15210 ◽  
Author(s):  
H. H. Hsieh ◽  
Y. K. Chang ◽  
W. F. Pong ◽  
J. Y. Pieh ◽  
P. K. Tseng ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Charge Distribution ◽  
Electron Charge ◽  
Cu Alloys ◽  
Electron Charge Distribution

Isotope Effect of the Pure 35Cl and 37Cl Quadrupole Resonance Spectra in CHCl2COOH and CDCl2COOD

1977 ◽  
Vol 32 (5) ◽  
pp. 415-419 ◽  
Author(s):  
Helmut Rager ◽  
Alexander Wergin
Keyword(s):  
Electronic Structure ◽  
Temperature Dependence ◽  
Isotope Effect ◽  
Small Difference ◽  
Electric Field Gradient Tensor ◽  
Gradient Tensor ◽  
Chlorine Isotopes ◽  
Resonance Frequencies ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract The temperature dependence of the pure nuclear quadrupole resonance of 35Cl and 37Cl in solid CHCl2COOH and CDCl2COOD has been measured. The spectra are doublets according to two dif­ferent sites, Cl (I) and Cl (II), of the chlorine atoms in the CXCl2 group (X = H,D). In CHCl2COOH and CDCl2COOD the 37Cl spectra became unobservable above 198 K and 175 K and the 35Cl spectra vanished at 238 K and 226 K, respectively. The temperature dependence was calculated using the Bayer-Kushida theory which gives a satisfactory approach in the case of the compounds investigated here. A small difference has been found in the temperature dependence of the resonance frequen­ cies for CI (I) and CI (II) in both the CHCl2 and CDCl2 group, which is probably due to differences in the bond lengths of CI (I) and CI (II). Furthermore, there is a different temperature dependence of the resonance frequencies of the chlorine isotopes at the sites CI (I) and CI (II). This gives evi­ dence for the so-called isotope effect: i. e. there are slightly different thermal motions for the chlorine isotopes which are involved in the averaging of the electric field gradient tensor. The re­ placement of protons by deuterons gave a shift of the resonance frequencies of about 20 kHz to lower values. This may be primarily caused by effects of deuteration on the electronic structure.

Sign in / Sign up

Export Citation Format

Share Document