Instant Notes: Analytical Chemistry

Fig. 3. FTIR spectra. (a) Interferogram; (b) FT spectrum of polystyrene plus background;

(c) spectrum of polystyrene after subtraction of background.

E3 – Spectrometric instrumentation 205

100

80

60

40

20

0

–20

–40

–60

–80

–100

(a)

(b)

–100 –80 –60 –40 –20 0 20 40 60 80 100

100

90

80

70

60

50

40

30

20

10

0

4000 3600 2800 2000 1600

cm–1

Displacement

1200 800 400

%T

(c)

100

90

80

70

60

50

40

30

20

10

0

4000 3600 2800 2000 1600

cm–1

1200 800 400

%T

Intensity