Autoionizing

Conventional associative ionization (AI) occurring at ambient temperature proceeds in two steps excitation of isolated atoms followed by molecular autoionization as the two atoms approach on excited molecular potentials. In sodium for example [44]... 

A water molecule has amphoteric character. This means it can act as both an acid and a base. The autoionization equilibrium process in water. 

Click Coached Problems for a self-study module on autoionization. 

Kw is also widely called the autoionization constant and sometimes the ion product constant of water. 

Aufbau principle See building-up principle. autoionization See autoprotolysis. autoprotolysis A reaction in which a proton is transferred between two molecules of the same substance. The products are the conjugate acid and conjugate base of the substance. Example ... 

It is well known that the value of the p parameter, more than the cross-section a, often shows a strong response to resonant structure embedded in the continuum. Given the sensitivity exhibited by the parameter in the foregoing there must be an a priori expectation that it would also show a strong response to resonant behavior. Computational methods do not yet exist to deal with autoionization phenomena in the systems of interest here, but one electron shape resonances can, in principle, be examined. 

From the available evidence Stener and co-workers [53, 60] conclude that the chiral parameter is more sensitive to small asymmetries in the molecular potential than to continuum collapse effects at resonance. At present, such conclusions must be provisional as there is little direct evidence. There is also no evidence regarding likely behavior at autoionization resonances, and this too deserves attention. 

The sitnation for the states is similar, because of the autoionizing state... 

The formal basis employed in the K-matrix calculation includes the relevant partial wave channel (pwc) subspaces plus a "localized channel" (/c) of discrete functions. These last are usual Cl states and their inelusion in the basis allows to efficiently reproduce the autoionizing states and the eorrelation effects. 

As discussed in (4), the K-matrix has a pole at energies near a resonance and this yields a convenient method for the analysis of the narrow autoionizing states. The matrix representation of equation [2] upon a finite basis may be in fact recast in the form (4)... 

Table 3. Wave energies and widths of autoionizing states. a — b) means a 10 ...

If we suppose that these Rydberg states have non-negligible lifetimes against autoionization, as could occur via dispersion of the potential energy of the molecule into various vibrational modes, then these states would be very sensitive to electric fields in the measuring apparatus. It is suggested here that this is the reason for the large discrepancies between cross sections measured in the various beam experiments. 

It is a straightforward task to construct a rate model for the reaction scheme shown in Figure 9. Electron capture and its inverse (autoionization),... 

The rate coefficients for H" in the autoionizing states (s, p) may differ from those in higher /-states and are treated differently (subscripts 0 and 1 ). A steady-state analysis of the rate equations gives a deionization coefficient of ... 

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