Charge transfer resonant

There are three types of simple charge transfer (a) resonant charge transfer, (b) accidental resonant charge transfer and (c) non-resonant charge transfer. 

This is the charge transfer between like particles represented by 

When the relative velocities of encounter are intermediate , the cross-section for this type of reaction has been found to decrease with increasing relative velocity v according to 

In the impact parameter method, the model is such that the trajectory and velocity of the incident particle is little changed by the interaction forces between the ion and the neutral particle, and each trajectory haS a reaction probability P b, v) determined by its impact parameter b and velocity u. Thus the reaction cross-section Ur is given by 

In obtaining P(b, v), a one-electron treatment is used even when A is a poly electronic system, and is treated as a point centre of positive 

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The surface work fiincdon is fonnally defined as the minimum energy needed m order to remove an electron from a solid. It is often described as being the difference in energy between the Fenni level and the vacuum level of a solid. The work ftmction is a sensitive measure of the surface electronic structure, and can be measured in a number of ways, as described in section B 1.26.4. Many processes, such as catalytic surface reactions or resonant charge transfer between ions and surfaces, are critically dependent on the work ftmction. 

Important cases of exact resonance are the symmetrical resonance charge transfer collision... 

THEORY OF RESONANT CHARGE TRANSFER IN ATOM-SURFACE SCATTERING... 

While such a description of resonant charge transfer is broadly correct, it is, of course, an entirely static account which requires modifying before it can be... 

Finally in this section, we note that the use of perturbation theory, particularly for quasi-resonant charge transfer, has been developed by Battaglia, George and Lanaro They show that first-order perturbation theory is satisfactory for high-velocity atoms, with Eq lying outside the solid band, and they have examined in detail protons scattered from alkali-halide... 

In this chapter we have shown that the TDAN model gives a good description of the resonant charge-transfer process in atom-surface scattering. While it is unfortunate that exact solutions for the TDAN wavefunction cannot be obtained, the one-electron method can be used to find approximate solutions which allow qualitative predictions to be made. On the whole, these predictions are in reasonable accord with experimental Hndings. 

Theory of Resonant Charge Transfer in Atom-Surface Scattering 335... 

In the early studies, the cycloalkane holes were viewed as molecular radical cations that undergo rapid resonant charge transfer. At any given time, the positive charge was assumed to reside on a single solvent molecule and, once in 0.5-2 psec, to hop to a neighboring molecule. The low activation energy was explained by the similarity between the shapes of cycloalkane molecules and their radical cations [60]. 

A typical example of the tunnel non-resonance charge transfer is charge transfer in collisions of the ions H and H+... 

The example considered shows that, due to electron tunneling at large distances, the non-resonance (as well as resonance) charge transfer in the gas phase can occur at distances which substantially exceed the size of the colliding particles themselves. 

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