Absolute excitation and emission yields

The number of photons emitted from an irradiated gas sample were obtained by summing the integrated emission over the exciplex spectrum, and then correcting for the dimer rare gas fluorescence and X-rays. The irradiation energy deposited was measured using conventional ozone dosimetry [69], performed under identical conditions to the emission measurements. 

Based on this mechanism, the measured yield of XeF fluorescence, Gj, is given by 

The very low derived value of Go, as compared to its theoretical value of 

5 based on the xenon W value of 22.1 ev/ion-pair [70], gives a photon yield per ion pair recombination value of 0.06. This suggests that production of the XeF (B,C) state is only a very minor pathway for ionic recombination in this system. It is believed that dominance of other recombination products may be due to the involvement of the molecular anion in this system [64]. 

Absolute emission yields for other exciplexes have also been determined, following the methodology given for XeF. A summary of the limiting, unquenched fluorescence yields for excited state and ionic recombination reactions is given in Table 14. 

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