Abstract

The dependence of the total absorptance of the bands of carbon monoxide near 4.7 μ and 2.3 μ, and of methane near 3.3 μ,on the temperature, pressure, and amount of absorbing gas, has been measured. Pure absorbing samples were studied for pressures between 100 mm Hg and 1000 mm Hg, and at temperatures up to 400°C, for a fixed pathlength of 30.6 cm. The nature of and possible reasons for the observed temperature dependence of the total absorptance are discussed.

© 1965 Optical Society of America

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References

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  1. J. N. Howard, D. E. Burch, D. Williams, Geophysical Research Paper No. 40, GRD, Air Force Cambridge Research Center (1955). See also J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956).
  2. D. E. Burch, D. Williams, Appl. Opt. 1, 473 (1962).
    [Crossref]
  3. D. E. Burch, D. Williams, Appl. Opt. 1, 587 (1962).
    [Crossref]
  4. D. E. Burch, D. A. Gryvnak, D. Williams, Appl. Opt. 1, 759 (1962).
    [Crossref]
  5. R. M. Chapman, J. N. Howard, J. Opt. Soc. Am. 42, 423 (1952).
    [Crossref]
  6. W. S. Benedict, R. Herman, G. E. Moore, S. Silverman, Astrophys. J. 135, 277 (1962).
    [Crossref]
  7. H. Goldring, W. Benesch, Can. J. Phys. 40, 1801 (1962).
    [Crossref]
  8. W. Gordy, W. Smith, R. Tambarulo, Microwave Spec-trosropy (Wiley, New York, 1953), p. 196.

1962 (5)

1952 (1)

Benedict, W. S.

W. S. Benedict, R. Herman, G. E. Moore, S. Silverman, Astrophys. J. 135, 277 (1962).
[Crossref]

Benesch, W.

H. Goldring, W. Benesch, Can. J. Phys. 40, 1801 (1962).
[Crossref]

Burch, D. E.

D. E. Burch, D. Williams, Appl. Opt. 1, 473 (1962).
[Crossref]

D. E. Burch, D. Williams, Appl. Opt. 1, 587 (1962).
[Crossref]

D. E. Burch, D. A. Gryvnak, D. Williams, Appl. Opt. 1, 759 (1962).
[Crossref]

J. N. Howard, D. E. Burch, D. Williams, Geophysical Research Paper No. 40, GRD, Air Force Cambridge Research Center (1955). See also J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956).

Chapman, R. M.

Goldring, H.

H. Goldring, W. Benesch, Can. J. Phys. 40, 1801 (1962).
[Crossref]

Gordy, W.

W. Gordy, W. Smith, R. Tambarulo, Microwave Spec-trosropy (Wiley, New York, 1953), p. 196.

Gryvnak, D. A.

Herman, R.

W. S. Benedict, R. Herman, G. E. Moore, S. Silverman, Astrophys. J. 135, 277 (1962).
[Crossref]

Howard, J. N.

R. M. Chapman, J. N. Howard, J. Opt. Soc. Am. 42, 423 (1952).
[Crossref]

J. N. Howard, D. E. Burch, D. Williams, Geophysical Research Paper No. 40, GRD, Air Force Cambridge Research Center (1955). See also J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956).

Moore, G. E.

W. S. Benedict, R. Herman, G. E. Moore, S. Silverman, Astrophys. J. 135, 277 (1962).
[Crossref]

Silverman, S.

W. S. Benedict, R. Herman, G. E. Moore, S. Silverman, Astrophys. J. 135, 277 (1962).
[Crossref]

Smith, W.

W. Gordy, W. Smith, R. Tambarulo, Microwave Spec-trosropy (Wiley, New York, 1953), p. 196.

Tambarulo, R.

W. Gordy, W. Smith, R. Tambarulo, Microwave Spec-trosropy (Wiley, New York, 1953), p. 196.

Williams, D.

D. E. Burch, D. Williams, Appl. Opt. 1, 587 (1962).
[Crossref]

D. E. Burch, D. Williams, Appl. Opt. 1, 473 (1962).
[Crossref]

D. E. Burch, D. A. Gryvnak, D. Williams, Appl. Opt. 1, 759 (1962).
[Crossref]

J. N. Howard, D. E. Burch, D. Williams, Geophysical Research Paper No. 40, GRD, Air Force Cambridge Research Center (1955). See also J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956).

Appl. Opt. (3)

Astrophys. J. (1)

W. S. Benedict, R. Herman, G. E. Moore, S. Silverman, Astrophys. J. 135, 277 (1962).
[Crossref]

Can. J. Phys. (1)

H. Goldring, W. Benesch, Can. J. Phys. 40, 1801 (1962).
[Crossref]

J. Opt. Soc. Am. (1)

Other (2)

W. Gordy, W. Smith, R. Tambarulo, Microwave Spec-trosropy (Wiley, New York, 1953), p. 196.

J. N. Howard, D. E. Burch, D. Williams, Geophysical Research Paper No. 40, GRD, Air Force Cambridge Research Center (1955). See also J. Opt. Soc. Am. 46, 186, 237, 242, 334, 452 (1956).

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Figures (10)

Fig. 1
Fig. 1

Spectra of the CO 4260 cm−1 band.

Fig. 2
Fig. 2

Total absorptance of the CO 4260 cm−1 band as a function of the quantity T−0.24 (wP)0.5

Fig. 3
Fig. 3

Spectra of the CO 2143 cm−1 band.

Fig. 4
Fig. 4

The dependence of total absorptance of the CO 2143 cm−1 band on the amount of CO, for various temperatures.

Fig. 5
Fig. 5

The dependence of total absorptance of the CO 2143 cm−1 band (pressure corrected) on the amount of CO, for various temperatures.

Fig. 6
Fig. 6

The dependence of total absorptance of the CO 2143 cm−1 band on temperature, for fixed pressures.

Fig. 7
Fig. 7

Spectra of the CH4 3020 cm−1 band.

Fig. 8
Fig. 8

The dependence of total absorptance of the CH4 3020 cm−1 band on the amount of CH4, for various temperatures.

Fig. 9
Fig. 9

The dependence of total absorptance of the CH4 3020 cm−1 band (pressure corrected) on the amount of CH4, for various temperatures.

Fig. 10
Fig. 10

The dependence of total absorptance of the CH4 3020 cm−1 band on temperature, for fixed pressures.

Equations (17)

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ν 1 ν 2 A ( ν ) d ν ( cm - 1 ) ,
w = p 760 L 273 T ( atm cm N . T . P . ) ;
ν 1 ν 2 A ( ν ) d ν = ν 1 ν 2 ( 1 - e - K ( ν ) w ) d ν ,
α r = ( 2 π k T ) ½ 4 π [ N a ( D a , a ) 2 ( 2 M a ) ½ ] ;
α r P / T ½ .
α r P / T a ,
D a , a T - b ,
A ( ν ) d ν i S i w = S band w .
A ( ν ) d ν w
A ( ν ) d ν 2 w ½ i S i ½ α i ½ ,
A ( ν ) d ν ( w P ) ½ .
A ( ν ) d ν = K ( T ) [ w P ] 0.50 ,
K ( T ) = 0.55 T - 0.24 .
A ( ν ) d ν = 0.55 T - 0.24 ( w P ) 0.50 ,
4 cm - 1 < A ( ν ) d ν < 27 cm - 1 , 24 ° C < T < 400 ° C , 250 mm < P < 1000 mm .
A ( P , T ) = A ( P 0 , T 0 ) + Δ A ( P ) + Δ A ( T ) ,
A ( T ) = A ( P , T ) - Δ A ( P ) = A ( P 0 , T 0 ) + Δ A ( T )             [ w fixed P fixed ] .

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