Abstract

A high resolution Fourier transform spectrometer has been constructed for working in the far infrared region. After a description of this instrument, its performance in the 10–40 cm−1 spectral region is demonstrated by studying the pure rotational spectra of CH3Cl and CH3Br. A working resolution of 0.05 cm−1 is verified, and isotopic splitting is observed in CH3Br out to 14 cm−1.

© 1974 Optical Society of America

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Figures (5)

Fig. 1
Fig. 1

Schéma optique de l’appareil.

Fig. 2
Fig. 2

Spectre de la fonction d’interpolation.

Fig. 3
Fig. 3

Filtre idéal.

Fig. 4
Fig. 4

Spectre de rotation pure de CH3BR: (a) p = 5 torr; (b) p = 10 torr.

Fig. 5
Fig. 5

Spectre de rotation pure de CH3Cl: (a) p = 10 torr; (b) p = 6 torr; (c) p = 13 torr.

Tables (2)

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Tableau I Valeurs des constantes rotationnelles

Equations (8)

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δ σ = 1 Δ max = 0.05 cm - 1 .
σ = 2 B 0 ( J + 1 ) - 4 D J ( J + 1 ) 3 - 2 D J K K 2 ( J + 1 ) ,
Δ σ = 2 Δ B 0 ( J + 1 ) ,
Δ σ = 1 , 365 ( J + 1 ) 10 - 2 cm - 1 ,             pour CH 3 Cl , Δ σ = 2 , 4 ( J + 1 ) 10 - 3 cm - 1 ,             pour CH 3 Br .
soit Δ σ = 2 σ M , f ( δ ) = Δ σ sin Π Δ σ δ Π Δ σ δ .
h = 1 2 σ max .
F ( δ ) = Δ σ sin Π δ Δ σ Π δ Δ σ cos 2 Π δ σ m .
σ e = σ v [ 1 - ( i 2 M / 4 ) ] ,

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