Charge exchange resonance

Ion Scattering Spectrometry Low-Energy Ion Scattering Resonance Charge Exchange... 

The chemisorption process has its maximum cross section at 11 eV in contrast with cross sections for the radiolysis of bulk ice. This difference was understood as being dependent on the selective quenching of dissociative electronic states of water due to the resonant charge exchange between the substrate and adsorbate and the absence of multiple inelastic scattering in the H2O bilayer on Si(lll). 

Collisions, Atomic, Resonant Charge Exchange in (Lichten). .. 13 41... 

This formula, obtained by Sena [17], correctly describes the dependence of the resonance charge exchange cross-section on the velocity of the colliding... 

The quantitative theory of resonance charge exchange has been developed by Firsov [18]. The basis for calculations was the fact that, when the energies of the colliding particles relative motion are small, the solution of the time-dependent Schrodinger equation appears to be the wave function ... 

These formulae, obtained by Firsov [18], are widely used to calculate the resonance charge exchange cross-sections [19]. A typical example, demon-... 

Fig. 6. Cross-section for the resonance charge exchange in Rb Rb collisions [19]. The points are the experimental data. The line corresponds to theoretical calculations.

The second step in this reaction chain is resonant (comparable to resonant charge exchange between H-atoms and protons), if the molecules are vibrationally excited in the v = 4 level. 

Cosmic ray ionization of H leads to the formation of HD through a sequence of reactions. The resonant charge-exchange reaction, whose rate constant has been given (Watson et al. 1978)... 

On the basis of the above analysis, one can construct the hierarchy of interactions for a quasimolecule consisting of a halogen ion and its parent atom at typical distances between these particles for resonant charge exchange (2). As a result, we... 

Comparing this with the data in Table 1, the real situation is found to be between the cases " a and " c of Hund coupling, but case (6) docs not correspond exactly to any one of the Hund cases. Now we evaluate the exchange ion-atom interaction potential A(i ) on the basis of the formula for the resonant charge exchange cross section (Te,r ill the case of the transition of s—electron [4, 14, 15]... 

We now determine the exchange ion-atom interaction that allows us to evaluate the cross section of resonant charge exchange. On this way we represent the wave function of the atom having n valence electrons of momentum within the framework of the LS—coupling scheme in the form [2, 12, 23] ... 

Here c is the collision velocity, the asymptotic coefficient is expressed through the atom ionization potential I, and in atoinic units it is etjual to n = / (see also formula (23)). This formula is valid for transfer of an. s—electron or in the case when transitions for states with given quantum numbers may be separated. In particular, the partial cross sections of resonant charge exchange in the chlorine case are given in Table 4. 

We now consider one more example of resonant charge exchange with transition of a p electron... 

TABLE 6. The paramctci-s of iutaaction for the quasiinolcciilc aiipartial cross sections of resonant charge exchange x are expressed in and are taken at collision energies e in the laboratory fraine of reference of 0.1,1 and lOel respectively. 

The average cross section of resonant charge exchange is... 

TABLE 7. The ion-atom exchange interaction potential for the quasi-molecule S- /2) — 0 Pj) when its quantum numbers arc J and M (the total atom moment and the projection of the atom orbital momentum onto the molecular axis). The partial cross sections of resonant charge exchange at indicated quantum numbers and collision energies in the laboratory frame of reference arc expressed in. ... 

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