measuring
beam
detector
sample
reference
beam
I i
I r
baseline
signals
wave length
spectrum
intensity
detector
sample
I i
wave length
spectrum
intensity
polychromaƟc
radiaƟon
source
measuring
beam
monochromator
Fig. 4.37 Scheme of an UV/Vis spectrometer
5.5
5.0
4.5
3.5
3.0
2.5
240
280
320
360 nm
log
ε
λ
Fig. 4.38 UV/Vis spectrum of azulene
78
4 Instrumental Analysis