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

By W G Frankenberg

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And the hydrogen level is, of course, at -1 Ryd. Obviously, a very large positive delocalization energy would be involved in the formation of a metallic-like surface bond with this system. 9 Ryd. Moreover, there is a low-lying narrow partially filled d band with a high density of states; and because of this, the mean electron energy in the solid is not far above the bottom of the conduction band. Hence, the delocalization energy will be small. 15 Ryd. above the top of the d band. The mean electron energy in the solid and the delocalization energy are therefore probably larger than in the case of nickel.

5. Spectral density caused by Brownian-type motions versus frequency. rc is the correlation time for the random motion and YO is a NMR frequency. When rC-l is of the order of Y O or less than Y O , T1 becomes longer since the spectral density of quanta is less. Thus, for example in a liquid, it is found that T1decreases with increasiiig viscosity (increasing r c ) to a certain point ( ~ ~ -N1 y o ) and then increases with increasing viscosity. A simple proportionality between r c and the viscosity is given by the Debye theory of liquids.

93 1V. Conclusion.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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.

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