Electron-nuclei spin coupling in GaAs—Free versus localized electrons
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Abstract:
We report on an experimental evidence of a significantly different dynamic nuclear polarization (DNP) for localized and itinerant electrons in n-GaAs. Optically injected spin-polarized electrons are used to generate dynamic nuclear polarization via electron-nucleus hyperfine interaction. Using time resolved Kerr rotation measurements for probing the transient Overhauser field, the DNP time constants for itinerant and localized electrons are extracted to be 10 min and less than 1 min, respectively. This is attributed to a rapid DNP occurring in the vicinity of the donors followed by a delayed nuclear spin polarization in between the donor sites.Keywords:
Hyperfine coupling
The hyperfine structure of the J = 2 ← 1 rotational transition of CuBr has been measured in the 12 GHz frequency region using a Stark modulated high temperature microwave spectrometer. The molecules were produced by the reaction of Br2 vapour with copper in the heated zone of a splitted wave guide at a temperature of 800 °C. The analysis of the hyperfine structure yielded the following quadrupole coupling constants
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Rotational spectrum
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The SIC-X_α method is used to obtain the magnetic dipole hyperfine structure constant A of 3p()~2P_(3/2) state in Na atom.The results agree well with the experiments.For the research of electric hyperfine structure,we calculated the electric field gradient q,and deduced the nuclear electric quadrupole(moment) Q according to the experimental value of the electric hyperfine coupling constant B.Thus,the structure of Na nucleus is calculated.This is an attempt to reveal the nucleus structure by the method of(atomic) physics.
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The first EPR measurements of the hyperfine structure of tetragonal centres of U5+ in NaF and LiF are reported. These spectra (observed at 77K) are characterized by a very large electric quadrupole splitting larger or of the same order of magnitude as the magnetic hyperfine interaction. An analytical method has been developed for evaluating the hyperfine and quadrupole coupling parameters. Exact numerical diagonalization was required for the best fitting.
Tetragonal crystal system
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Abstract The hyperfine structure of the rotational transition J = 1 ← 0 of 63 Cu 35 Cl in the ground vibrational state was observed. The analysis resulted in the following nuclear quadrupole coupling constants: 63 Cu: e q 0 Q= +16.08(20) MHz; 35 Cl: eq 0 Q = - 32.25(15) MHz. The influence of the small magnetic spin rotational coupling of both nuclei on the hyperfine spectrum is discussed.
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Rotational spectrum
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Coupling constant
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Hyperfine coupling
Rotational spectrum
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Hyperfine coupling
Muon capture
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Hyperfine coupling
Matrix (chemical analysis)
Solid-state physics
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Europium
Hyperfine coupling
Degenerate semiconductor
Coupling constant
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New measurements of the hyperfine splittings of the levels of the lowest 8,6F terms in the configuration 5f67s of Pu ii have been obtained by use of three different high-resolution methods. These new data allow a detailed theoretical analysis of the hyperfine structures. Eigenfunctions of the levels of 5f67s, in intermediate coupling, are first obtained by diagonalization of the whole energy matrices, after which the values of the af01,af12,af10 and as10 hyperfine-structure parameters are determined by a least-squares optimization. Analogous studies of the energies and of the hyperfine structures were done on the 5f67s2 configuration of Pu i.
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