The situation with the case of ArF laser excitation is different,
Fig. 9. Beside red band at 750 nm there is a band at 600 nm.
Visually, the luminescence of the sample is yellow under excitation
with ArF laser. This band at 600 nm is little depending on
temperature with cooling to 9 K, Fig. 9 inset, whereas there is
sufficiently good correspondence between thermal dependence of
the red band at 750 nm excited with ArF and KrF lasers, Fig. 9
inset. There is significant difference in the decay of the band at
750 nm under excitation with KrF and ArF lasers. Under ArF laser
decay takes place in range of time up to 0.3 ms, non-exponential
corresponding to empirical Becquerel law [19] 1/(1þat)1.19. That
could be explained with some process of center living time limitation
and participation in recombination processes.