Subexcitation electrons spectrum

The molecular time scale may be taken to start at 10 14 s following energy absorption (see Sect. 2.2.3). At this time, H atoms begin to vibrate and most OH in water radiolysis is formed through the ion-molecule reaction H20+ + H20 H30+ + OH. Dissociation of excited and superexcited states, including delayed ionization, also should occur in this time scale. The subexcitation electron has not yet thermalized, but it should have established a quasi-stationary spectrum its mean energy is expected to be around a few tenths of an eV. 

The energy distribution of subexcitation electrons in liquids has not been studied thoroughly, and there is only a small number of papers on the matter.143,220 In Ref. 220 the authors have found 77(E) considering the liquid as a dense gas and using the formulas for the cross sections obtained within the theory of binary collisions.146 In Ref. 143 the spectrum of subexcitation electrons was calculated using the Monte Carlo method. Apparently, it was in this study the influence the state of aggregation of water has on the energy distribution of subexcitation electrons was considered for the first time. 

It is convenient to present the energy spectrum of subexcitation electrons in dimensionless units as a function hwm rj(E) of the variable Elhwater vapor each dot represents the average value for a small energy interval. One can note that the spectra... 

Fig. 13. Spectrum of subexcitation electrons in helium2, > (solid line), in water vapor (O), and in liquid water (A).143 Al, is the number of subexcitation electrons.

Thus, it is not easy to calculate the energy spectrum of subexcitation electrons taking into account all these processes, and, apparently, it can only be done using computer simulation. 

---