The Infra-Red Absorption Spectrum of C $D_{4}$

The spectrum of C

D_{4}

has been measured from 3.0μ to 10.5μ and three regions of absorption were observed. These bands with centers at 2992.8

{cm}^{- 1}

, 3103.7

{cm}^{- 1}

, 2259.0

{cm}^{- 1}

, and 995.86

{cm}^{- 1}

have been identified as

ν_{1} + ν_{4}

ν_{3} + ν_{4}

ν_{3}

, and

ν_{4}

by analogy with C

H_{4}

. The line spacings obtained from these bands in C

D_{4}

are

Δ ν_{ν_{1} + ν_{4}} = 7.17

{cm}^{- 1}

;

Δ ν_{ν_{3} + ν_{4}} = 5.01

{cm}^{- 1}

Δ ν_{3} = 4.52

{cm}^{- 1}

;

Δ ν_{4} = 3.42

{cm}^{- 1}

as compared with 5.3

{cm}^{- 1}

, 13.5

{cm}^{- 1}

, 9.77

{cm}^{- 1}

and 5.41

{cm}^{- 1}

for the same bands in C

H_{4}

. Values for the

ζ' s

of Johnston and Dennison have been obtained and are as follows:

ζ_{3} = 0.1465

and

ζ_{4} = 0.3535

. Utilizing the line spacings given above and the expression

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The Infra-Red Absorption Spectrum of CD4