Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"Knight shift"”.
-
Microscopic Theory of the Knight Shift
… the development of a microscopic theory of the Knight shift. The Knight shift experiment has been used in superconductivity research throughout history, however, a complete understanding of the Knight shift in conventional as well as unconventional superconductors does not yet exist. Motivated …
-
Magnetic Susceptibility and Knight Shift Measurements in Aluminum - Rare-Earth Alloys
Made available in DSpace on 2015-05-12T21:41:43Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6801864.PDF: 2549858 bytes, checksum: cb0cfc5fc4047f5e5f473d5a8e40d6ac (MD5) Previous issue date: 1967
-
Magnetic susceptibility and knight shift measurements in aluminum-rare earth alloys
… of magnetic susceptibility and solvent Knight shift in dilute alloys of rare earth metals in aluminum have been carried out. The susceptibility results give a clear indication that localized moments exist on each impurity except La, Yb, and Lu, and that the coupling between the total …
-
The Effect of Gadolinium on The Knight Shift in Certain Non-Transition-Metals and Alloys
Made available in DSpace on 2015-05-12T22:38:58Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7405611.PDF: 4635740 bytes, checksum: defcecf8069b8876e24835179e51df72 (MD5) Previous issue date: 1973
-
The effect of gadolinium on the Knight shift in certain non-transition metals and alloys
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-03-09T18:16:35Z No. of bitstreams: 1 1973_koch.pdf: 5089765 bytes, checksum: 34cce4a19d1c8be47ecfb6ab70741ac9 (MD5)
-
A Study of Dilute Aluminum and Vanadium Nmr in Alpha-Titanium and in Hydrogen Doped Alpha-Titanium (Knight Shift, Electron Distribution, Quadrupole Interaction, Anisotropic, Alloy(hcp))
… effects of nuclear quadrupole and anisotropic shift interactions, dipolar broadening, and inhomogeneous Knight shift distribution. From the simulation work, experimental parameters such as electric field gradient (EFG), axial anisotropic Knight shift K(,ax), and isotropic Knight shift are …
-
Rare earth impurities in metals: The transition from virtual to bound f levels
Measurements of the solvent Knight shift and bulk magnetic susceptibility have been carried out in dilute alloys of the rare earth metals in liquid Cu. Other measurements of the Al and Cu Knight shift in dilute alloys of Gd in Al-Cu and Al-Ag binary alloys have also been made. The susceptibility …
-
Transitional impurities in liquid copper
… and found to change little on melting. The Cu63 Knight shift in liquid copper is found to be decreased by dissolved transition impurities with the maximum decrease of about 20% for each atomic percent of impurity occurring in the Cu-Mn solutions. The change caused by magnetic impurities in the …
-
A nuclear magnetic resonance study of UNI₂AL₃
… effects of both a quadrupolar interaction and a Knight shift has been examined for the case of non-axial symmetry. A detailed derivation is given, correct to second order in perturbation theory, for the case where the quadrupole interaction is significantly smaller than the Zeeman interaction. …
-
Nuclear magnetic resonance studies of YBa2̳Cu3̳07̳ in the superconducting state
In this thesis we report measurements of the 63Cu Knight shift in the · superconducting state for the plane (Cu(2)) and Chain (Cu(l)) sites in YBa2Cu307. We also have measured the temperature and field dependent 63Cu(2) nuclear spin relaxation rates (63Wla) in the superconducting state. The …
-
13C-nuclear-magnetic-resonance of carbon monoxide on platinum: Study of a highly dispersed catalyst
… relaxation times establish the presence of a 13C Knight shift AH. The spin-lattice relaxation times are independent of the applied field Ho and follow the Korringa relation, T1T(AH/H)2 = constant. From 77 K to 300 K, the relaxation of the omagnetization is multiexponential: the distribution in …
-
Nuclear magnetic resonance study of the bonding of carbon monoxide to palladium and platinum surfaces
… position is interpreted as the sum of a chemical shift of 230 ppm, typical of CO in transition metal carbonyls, and a Knight shift of 310 ppm. The 13c lineshape and spin lattice relaxation time T1 were measured from 77 K to 400 K. The temperature dependence of the T1 is used to confirm the …
-
Carbon-13 - Nuclear - Magnetic - Resonance of Carbon Monoxide on Platinum: Study of a Highly Dispersed Catalyst (Nmr)
… times establish the presence of a ('13)C Knight shift (DELTA)H. The spin-lattice relaxation times are independent of the applied field H(,0) and follow the Korringa relation, T(,1)T((DELTA)H/H(,0))('2) = constant. From 77 K to 300 K, the relaxation of the magnetization is multiexponential: …
-
Nuclear magnetic resonance studies of yttrium barium copper oxide in the superconducting state
… thesis we report measurements of the $\sp{63}$Cu Knight shift in the superconducting state for the plane (Cu(2)) and chain (Cu(1)) sites in YBa$\sb2$Cu$\sb3$O$\sb7$. We also have measured the temperature and field dependent $\sp{63}$Cu(2) nuclear spin relaxation rates ($\sp{63}$W1$\alpha$) in the …
-
Nuclear magnetic resonance study of quantum size effects in supported platinum particles
… spin-lattice relaxation, and changes in the Knight shift at low temperatures.
-
Nuclear magnetic resonance study of quantum size effects in supported platinum particles
… spin-lattice relaxation, and changes in the Knight shift at low temperatures. He shows that the variation of the quantum size effects at 4.2K with particle size is consistent with a prediction based on simply scaling the bulk density of states at the Fermi energy with the volume of the …
-
NMR Studies of the Electronic Structure, Lithium-Ion Dynamics, and Prelithiation of Lithium-Ion Battery Anode Materials
… following the Korringa relation. The 7Li NMR shifts in graphite can be described by a direct Fermi-contact Knight shift while the 13C NMR shifts can be described in part by the combination of an anisotropic spin-dipolar Knight shift and an Isotropic Knight Shift.
-
The magnetic properties of the cuprate superconductors
… calculated nuclear magnetic relaxation rates and Knight shift agree favorably with experiment. This work provides further evidence for a dx2_112 pairing state and demonstrates that antiferromagnetic correlations persist in the superconducting state.
-
NMR studies of acetylene absorbed on supported platinum catalysts
… However, the spectrum measurements indicate no Knight shift, a deviation from the Korringa relation. Such a deviation implies that electronic states at the Fermi energy involve hybrids of the platinum conduction band with adsorbate molecular orbitals with no spatial density at the carbon …
-
Nuclear magnetic resonance study of promoted catalysis
… the Pt. The 23Na line shows no indication of a Knight shift and the Na spin-lattice relaxation varies as 1/T2 , suggesting that the Na orbitals mix with the Pt conduction band to a much lesser degree than do those of adsorbed CO. Consideration of several results leads us to conclude that the Na …
Page 1 of 2