When the sample has been
exposed to full UV + vis + IR spectrum, a WG 295 Edmund bandpass
filter has been used to block contaminating wavelengths
below 290 nm. In order to expose samples only to vis + IR
radiation, a GG 395 Melles Griot band-pass filter has been used
to cut all the wavelengths below 395 nm. In both cases, the
substrates have been exposed for 1, 3, 5 and 10 min.