Rare gas monohalides

The best characterized ion recombination systems are those involving irradiated rare gases. In the mid 1970 s rare gas-monohalide systems were extensively studied, due to their new-found application in u.v. exciplex lasers. Pulsed electron irradiation of these systems was the only major excitation method, as it allowed investigation under realistic laser pressure conditions of several atmospheres gas pressure. Typically these systems were investigated by monitoring of the time dependence of their characteristic peak fluorescence, as given in Table 12. 

Table 12. Summary of peak emission wavelengths of rare gas-monohalide exciplex species.

Figure 13.5 Schematic of potential energy curves for a rare-gas monohalide exciplex laser based on KrF. KrF is formed via two reaction channels. It decays to the ground state via dissociation into Kr and F while emitting a photon at 248 nm. (Adapted with permission from Francis Taylor Group LLC. " ) The diatomic halogen excimer lasers based on F2 also have similar potential energy curves.

Very recently pulsed laser action in the ultraviolet from excimer states of several rare gas monohalides has been reported. Laser wavelengths from 1930 to 3530 A are observed from 1 /2 transitions connecting the lowest... 

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