By J. H. Van Vleck (auth.), C. K. Coogan, Norman S. Ham, S. N. Stuart, J. R. Pilbrow, G. V. H. Wilson (eds.)
TWENTY-FIVE years in the past in Russia, Zavoisky made the 1st experimen tal statement of electron spin resonances; and a yr later Purcell, Torrey and Pound at Harvard and Bloch, Hansen and Packard at Stanford ('The Harvard of the West') saw nuclear magnetic resonances for the 1st time. In either circumstances (ESR and NMR) the phenomena were formerly envisioned, and Gorter - without doubt some of the most unfortunate experimenters of our time - had made his noble makes an attempt to notice magnetic resonances. Purcell et aZ. , having crushed their radar swords into medical ploughshares, used a re three sonant coaxial hollow space, stuffed the inductive half with 850 cm of paraffin, and produced a resonance with a signal-to-noise ratio of 20. They expected that the sensitivity may be elevated numerous hundred-fold and foresaw functions in picking magnetic mo ments, investigating spin-lattice coupling and measuring magnetic fields. Their letter reached the editor of Phys. Rev. on Christmas Eve 1945, and the root of NMR within the good kingdom was once laid. Bloch et aZ. , thankfully operating independently, proven the fullyyt varied, crossed-coil method of the commentary of NMR in a water pattern, which they doped with paramagnetic ions to lessen the relief instances. they'd laid the root of liquid-state NMR. Their letter to Phys. Rev. used to be bought on 29 January 1946.
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Additional info for Magnetic Resonance: Proceedings of the International Symposium on Electron and Nuclear Magnetic Resonance, held in Melbourne, August 1969, sponsored by the Australian Academy of Science
Example text
Bray, Phys. Chern. Glasses 8, 190 (1967). S. J. Bray, Phys. Chern. Glasses~, 213 (1967). J. Bray, Interaction of Radiation with Solids, Proceedings of the 1966 Cairo Solid State Conference, Cairo, ed. Ad1i Bishay (Plenum Press, New York, 1967), pp. 25-54. G. J. Bray, J. Chern. Phys. 48, 1709 (1968). J. Bray, Silikattechnik 19, 307, 350 (1968). J. O. G. F. Ross and I. Tatsuzaki, J. Chern. ~, 435 (1961). E. O'Rei11ey, J. Chern. Phys. 28, 1262 (1958). G. D. Thesis, Brown-university (1965). M. D. Thesis, Brown University (1969).
27 against the molar fraction of T£20 in the glass*. l) is fairly small for low-TJI,20 glasses. This is an indication that thallium is present as ions in those glasses. l) increases, indicating that a thallium with a considerable anisotropy in its chemical shift is present in the glass. The anisotropy can be attributed to substantial covalency in the bonding of this thallium to oxygen. Presumably, in the region from 0 to approximately 35 molar-percent T£20, there are two types of thallium, one that is essentially ionic and one that is substantially covalent.
R. OF Na AND Cu G. E. , Murray Hill, New Jersey INTRODUCTION A study was made to ascertain whether the nuclear quadrupole coupling constants of Cu and Na in more or less ionic crystals could be correlated with chemical properties such as net charge or electronegativity. A number of isostructural compounds were examined and such correlations appear to exist. The long-term aim is to collect sufficient data on isostructural compounds of varying degrees of ionicity, so that adequate tests can be made of some of the current theories of nuclear quadrupole coupling constants.