By W G Frankenberg

ISBN-10: 0080565190

ISBN-13: 9780080565194

ISBN-10: 0120078155

ISBN-13: 9780120078158

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FARNSWORTH rotated about an axis coinciding with that of the incident electron beam. Thus by properly adjusting the crystal for the desired azimuth, the diffraction pattern is explored by measuring the electron current t o the inner Faraday box as a function of its angular position. This procedure is repeated for a series of different primary voltages separated by small intervals to obtain the complete diffraction pattern in a given voltage range. Only the elastically scattered electrons are measured, since a retarding potential is placed on the inner collector.

The Desorption Rate Equations a. Desorption of atoms. Rates are now available for the desorption of atoms and molecules as a function of concentration of the adsorbed species for several systems. Thus, in the case of the desorption of atoms, it is possible to use Eq. (15b), since it is no longer necessary to express n, as a function of pressure. Unfortunately, we still cannot use the experimental data to arbitrate between possible models of the adsorbed state, because, whatever this state may be, it will be a good approximation to write f t / f 8 = 1 and the rate constant will be simply kT/h z l0ls sec-1 in agreement with experiment [see Eq.

Uch. Zap. Leningr. Qos. Univ. Serv. Fiz. Nauk 38, 52 (1939). 7 . , J . Phys. Chem. USSR. 22, 439 (1948). 8. , Chem. Abstr. 36, 30917 (1942). 9. Fabian, D. , and Robertson, A. J. , Proc. Roy. A237, 1 (1956). 10. , and Fletcher, P. , Nature 183 249 (1959). 11. , and Fletcher, P. , Proc. Roy. A250, 389 (1959). 12. , and Fletcher, P. , Trans. 56, 1662 (1960). 13. Hickmott, T. , J . Chem. Phys. 32, 810 (1960). 14. Bennett, M. , and Tompkins, F. , Trans. 53, 185 (1957). 15. , Phys. Rev. 35, 478 (1930).

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Advances in Catalysis and Related Subjects, Volume 15 by W G Frankenberg

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