Electron-Nuclear Double Resonance, Nuclear Moments, and〈r−3〉of Neodymium-143 (III) and Neodymium-145 (III) in Lanthanum Trichloride

1962 ◽  
Vol 127 (6) ◽  
pp. 1940-1948 ◽  
Author(s):  
Donald Halford
Keyword(s):  
Double Resonance ◽  
Electron Nuclear Double Resonance ◽  
Nuclear Moments

Electron–nuclear double resonance measurement of hyperfine interactions in Eu2+:CaWO4

1970 ◽  
Vol 48 (5) ◽  
pp. 562-573 ◽  
Author(s):  
H. Kiefte ◽  
J. S. M. Harvey
Keyword(s):  
Crystal Field ◽  
Quadrupole Interaction ◽  
Hyperfine Interactions ◽  
Double Resonance ◽  
Electron Nuclear Double Resonance ◽  
Nuclear Moments ◽  
G Factor ◽  
Resonance Measurement ◽  
Anisotropic Contribution ◽  
Made In

The hyperfine interactions in Eu2+ located substitutionally in CaWO4 have been accurately measured at a temperature of 4.2 °K by the method of electron–nuclear double resonance. These measurements were made in an attempt to determine the effects of the crystal field on the hyperfine interactions by comparison with results obtained for atomic Eu and Eu2+ in CaF2.The results have been fitted with a 12-parameter hyperfine Hamiltonian. Four of these parameters are used to represent an anisotropic quadrupole interaction and three to represent an anisotropic contribution of the form J3I. It is found that the spherically averaged quadrupole interaction is shifted by almost 20% from its value in CaF2. The nuclear g factor is also found to be shitted and anisotropic. These results are discussed in terms of a crystal-field induced shielding of the nuclear moments.

The Microscopic Structure Of Shallow Donors In Silicon Carbide

1996 ◽  
Vol 442 ◽  
Author(s):  
J.-M. Spaeth ◽  
S. Greulich-Weber ◽  
M. März ◽  
E. N. Kalabukhova ◽  
S. N. Lukin
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Temperature Dependence ◽  
Double Resonance ◽  
Epr Spectra ◽  
Electron Nuclear Double Resonance ◽  
Paramagnetic Resonance ◽  
Vacancy Pair ◽  
Temperature Spectra ◽  
Electron Paramagnetic

AbstractThe electronic structure of nitrogen donors in 6H-, 4H- and 3C-SiC is investigated by measuring the nitrogen hyperfine (hf) interactions with electron nuclear double resonance (ENDOR) and the temperature dependence of the hf split electron paramagnetic resonance (EPR) spectra. Superhyperfine (shf) interactions with many shells of 13C and 29Si were measured in 6H-SiC. The hf and shf interactions are discussed in the framework of effective mass theory. The temperature dependence is explained with the thermal occupation of the lowest valley-orbit split A1 and E states. It is proposed that the EPR spectra of P donors observed previously in neutron transmuted 6H-SiC at low temperature (<10K) and high temperature (>60K) are all due to substitutional P donors on the two quasi-cubic and hexagonal Si sites, whereby at low temperature the E state is occupied and at high temperature the A1 state. The low temperature spectra are thus thought not to be due to P-vacancy pair defects as proposed previously.

Sign in / Sign up

Export Citation Format

Share Document