Download Desorption Induced by Electronic Transitions DIET IV: by J. W. Gadzuk (auth.), Dr. Gerhard Betz, Dr. Peter Varga PDF

By J. W. Gadzuk (auth.), Dr. Gerhard Betz, Dr. Peter Varga (eds.)

This publication is the most recent to seem in a chain documenting the growth of this interesting box in floor technological know-how. It offers fresh effects and reports of the quickly transforming into box of interplay of debris and lasers with strong surfaces resulting in excitation, ionisation and desorption. the most emphasis is at the microscopic figuring out of nutrition, specially electron- and ion-induced desorption of adsorbed layers, emission from insulators, laser-induced desorption and ablation, photophysics and photochemistry. purposes starting from laser ablation for scientific reasons to vitamin in high-temperature superconductors also are defined.

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Extra info for Desorption Induced by Electronic Transitions DIET IV: Proceedings of the Fourth International Workshop, Gloggnitz, Austria, October 2–4, 1989

Example text

A(Z),fa(Z) and X(Z) are calculated for the different states respectively. We assume that all states are populated initially with equal probability, P. These expressions can readily be evaluated as function of alkali coverage. The results of the calculation are shown in fig. 6 along with the experimentally determined points. It can be seen that the agreement between theory and experiment is excellent. Both the H(n=2) and H(n=3) intensity increases linearly at small coverages (large work functions).

Oj tt ! +0 ! )(+ t,' )(+ Q.. :+. =2eV 20 40 60 Figure 3. Sample trajectories. Two impurity ions. 90 = 10°, £k = 4 eV, variable a. Figure 2. Sample trajectories. Single impurity ion. 90 = 10°, £k = 4 eV, variable a. 3 80 20 f "t f'i+ I' 0'" 0 20 40 80 INITIAL ANGLE (DEGREES) Figure 4. (Left) Influence of kinetic energy on trajectories. 3, variable £k. Figure 5. (Middle) Final desorption angle vs. initial bond angle for single impurity ion. £k = 4 eV, variable a. Dotdash line indicates no impurity ion.

19 Desorption Induced by Electronic Transitions, DIET IV Editors: G. Betz • P. Varga © Springer-Verlag Berlin, Heidelberg 1990 L:::) :-±. ;. METAL Figure 1. 25 bohr (right) from the positive background edge of the metal (indicated by the horizontal line). 001 electrons bohr- 3 • The charge bound to the Ar+ ion is polarized away from the metal, and there is an induced image-like charge density on the metal (shaded area). As the ion approaches the surface, the center-of-gravity of the image-like density moves toward the metal.

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