Download e-book for kindle: Advances in Catalysis and Related Subjects, Volume 12 by W G Frankenberg

By W G Frankenberg

ISBN-10: 0080565166

ISBN-13: 9780080565163

ISBN-10: 0120078120

ISBN-13: 9780120078127

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675 X lo4 gauss-' second-') where 2 X 55 1 = 2 energy levels occur. Equation (4) is the fundamental spectroscopic relationship of NMR. As one may verify by direct quantum mechanical calculation (9), the application of an oscillating magnetic field, HI,of angular frequency w , will cause transitions of the nuclear spin between adjacent magnetic energy + 36 D. E. O’REILLY states. A nuclear spin undergoing a transition to a higher energy state will absorb a quantum of energy hw from the electromagnetic field, and a spin in transition to an adjacent state of lower energy will emit a quantum h.

111 I. introduction Atomic nuclei and electrons possess magnetic dipole moments. I n the techniques of magnetic resonance spectroscopy, this property of nuclei and electrons is utilized by the application of a magnetic field to produce a number of energy levels by Zeeman splitting of the quantum states of the magnetic moment. elativeto the direction of the applied magnetic field, the magnetic moment takes up definite directions which differ in magnetic energy. Associated with the magnetic dipole moment, nuclei and electrons possess a spin angular momentum.

If the delocalization energy is not too large. For example, if z = +1 and z’ = - 1 [if z’ < -1, the combined system has occupied localized states and Equation (30) fails], we find A&, = 28. This is also the value of A & if the delocalization energy is zero. , it seems that quite strong metallic-like surface bonds can be formed if the energy level of the valence electron on the foreign atom falls within the range of occupied levels in the crystal. We note that this disposition of the energy levels does not occur with hydrogen and the alkali metals.

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Advances in Catalysis and Related Subjects, Volume 12 by W G Frankenberg


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