measurements at low transmission levels (up to 9 Abs). Moreover,
with its variable and fixed slits the spectrophotometer allows
optimum control over data resolution (the spectral bandwidth can
be set down to 0.01 nm). In this experiment, spectra were recorded
from 290 up to 400 nm using a spectral resolution and a data
interval of 1 nm. The samples were placed into the experimental
chamber at the entrance of the integrating sphere for the
transmittance analyses and at the exit port of the sphere for the
reflectance measurements.