Energy
excited electron
state
excited
vibraƟonal state
ground state
ΔE v = hν v
Rayleigh
scaƩering
Stokes
scaƩering
AnƟ-stokes
scaƩering
Light
source
Sample
Mirror
ScaƩered light
ScaƩered light
Monochromator
Detector
Fig. 4.49 Energy absorption scheme in Raman spectroscopy and the principal set-up of Raman
spectrometer
3500
3000
2500
2000
1500
1000
500
CH 3
O
Acetophenone
IR-spectrum
Raman-spectrum
Raman absorption
IR transmission
wave number [cm
-1 ]
Fig. 4.50 Scheme of complementary IR and Raman spectra of acetophenone
4.3 Spectroscopy
87