Signal intensity

(1)

11/06/2004

Signal

Mirror

displacement x

Beam splitter Detector

Fixed mirror

Moving mirror Light source

Fourier-Transform IR-Spektroskopie

(2)

0 5000 10000 15000 20000 25000 30000 35000 -0.2

-0.1 0.0 0.1 0.2 0.3 0.4

Signal *100

Signal *10

Signal

high_interfero_air.opj

Signal int e ns it y

∆x (Point Number)

Interferogram: Luft (H

₂

0 + CO

₂

)

Spiegelweg ca. 4.2 cm

(3)

11/06/2004

0 100 200 300 400 500 600 700 800 900 1000

-0.2 -0.1 0.0 0.1 0.2 0.3 0.4

Signal intensity

∆x (Point Number)

5000 5200 5400 5600 5800 6000

-0.0004 -0.0002 0.0000 0.0002 0.0004

Signal Intensity

∆x (Point Number)

Ausschnitt des Interferogrammes für kleine Spiegelverschiebungen

Ausschnitt des Interferogrammes für

mittlere Spiegelverschiebungen

(4)

0 1000 2000 3000 4000 5000 6000 7000 8000 0.0

0.2 0.4 0.6 0.8

high_air.opj

Signal (power spec tr um )

Wave number (cm

^-1

)

0 1000 2000 3000 4000 5000 6000 7000 8000

0.0 0.2 0.4 0.6 0.8

high_air.opj

Signal (power spec tr um )

Wave number (cm

^-1

)

Vakuum Luft Fouriertransformierte der Interferogramme:

i) Evakuiert ii) mit Luft im Spektrometer

(5)

11/06/2004

0 1000 2000 3000 4000 5000 6000 7000 8000

0.0 0.2 0.4 0.6 0.8 1.0 1.2

high_air.opj

Tran sm issi o n

wave number (cm

^-1

)

air vac

( ) ( )

( ) T I

I ν ν

= ν Transmission: Signal mit Probe/ Refererenzsignal

CO

₂

-asymmetrische Streckschwingung CO

₂

-asymmetrische

Streckschwingung

(6)

2280 2300 2320 2340 2360 2380 2400 0.8

1.0

∆ν = 1.395 cm^-1

high_air.opj

T ra n sm issi on

wave number (cm

^-1

)

(7)

11/06/2004

2350 2360 2370 2380 2390 2400

0.8 1.0

∆ν = 1.395 cm^-1

high_air.opj

T ra n sm issi on

wave number (cm

^-1

)

(8)

0 1000 2000 3000 4000 5000 6000 7000 8000 0.0

0.2 0.4 0.6 0.8 1.0 1.2

high_air.opj

Tran sm issi o n

wave number (cm

^-1

)

H

₂

O-Streckschwingung

(9)

11/06/2004

3400 3500 3600 3700 3800 3900 4000

0.8 1.0

high_air.opj

Tran sm ission

wave number (cm

^-1

)

(10)

0 1000 2000 3000 4000 5000 6000 7000 8000 0.0

0.2 0.4 0.6 0.8 1.0 1.2

high_air.opj

Tran sm issi o n

wave number (cm

^-1

)

CO

₂

-Biegeschwingung

(11)

11/06/2004

620 630 640 650 660 670 680 690 700 710 720 0.6

0.8 1.0

667.502 cm^-1

high_air.opj

Tran sm ission

wave number (cm

^-1