Abstract

The total absorption ∫Aν has been measured for the water vapor bands at 6.3, 3.2, 2.7, 1.87, 1.38, 1.1, and 0.94μ under simulated atmospheric conditions. The water vapor absorber concentrations studied ranged from 0.004 to 3.8 cm of precipitable water. Nitrogen was added to give total pressures up to atmospheric; the effects of nitrogen and oxygen on total absorption were found to be similar. The experimental data can be satisfactorily represented by two types of empirical relations:

  • (1) For small values of total absorption,

    Aνdν=cw12(P+p)k;

  • (2) For large values of total absorption,

    Aνdν=C+DLogw+KLog(P+p),

where w is the H2O absorber concentration, p is the H2O partial pressure, and P is the total pressure. Values of the empirically determined constants c, k, C, D, and K are given for each of the spectral regions of characteristic absorption. The results are compared with those of other experimentalists.

© 1956 Optical Society of America

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References

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  1. Howard, Burch, and Williams, J. Opt. Soc. Am. 46, 186 (1956).
    [Crossref]
  2. Howard, Burch, and Williams, J. Opt. Soc. Am. 46, 237 (1956).
    [Crossref]
  3. Harold Daw, Ph.D. dissertation, University of Utah (1955).
  4. J. N. Howard and R. M. Chapman, J. Opt. Soc. Am. 42, 423 (1952).
    [Crossref]
  5. Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

1956 (2)

1952 (1)

1951 (1)

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Burch,

Chapman, R. M.

Daw, Harold

Harold Daw, Ph.D. dissertation, University of Utah (1955).

Gebbie,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Harding,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Hilsum,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Howard,

Howard, J. N.

Pryce,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Roberts,

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Williams,

J. Opt. Soc. Am. (3)

Proc. Roy. Soc. (London) (1)

Gebbie, Harding, Hilsum, Pryce, and Roberts, Proc. Roy. Soc. (London) A206, 87 (1951).

Other (1)

Harold Daw, Ph.D. dissertation, University of Utah (1955).

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Figures (4)

Fig. 1
Fig. 1

Total absorption of the 2.7μ H2O bands plotted against concentration, for total absorption values greater than 200 cm−1.

Fig. 2
Fig. 2

“Reduced total absorption” of the 2.7μ H2O bands plotted against total pressure (above) and “weighted pressure” (below), for total absorption values greater than 200 cm−1.

Fig. 3
Fig. 3

Determination of “weak” fit for total absorption values less than 200 cm−1. Total absorption plotted against concentration (above). “Reduced total absorption” plotted against “weighted pressure” (below).

Fig. 4
Fig. 4

Validity of the empirical relations for the 2.7μ bands of H2O. o “Strong” fit for total absorption greater than 200 cm−1, x “Weak” fit for total absorption less than 200 cm−1.

Tables (3)

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Table I Range of absorption parameters.

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Table II Empirical relations for H2O bands.a

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Table III Comparison of Gebbie’s measurements with calculated values of total absorption.

Equations (7)

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A ν d ν = c w 1 2 ( P + p ) k ;
A ν d ν = C + D Log w + K Log ( P + p ) ,
A ν d ν = c w 1 2 ( P + p ) k             [ Weak band ] ,
A ν d ν = C + D Log w + K Log ( P + p )             [ Strong band ] ,
A ν d ν > 200 cm - 1 , A ν d ν = 246 Log w + f ( P )
A ν d ν = 337 + 246 Log w + 150 Log ( P + p ) ,
A ν d ν = 316 w 1 2 ( P + p ) 0.32 .