Abstract

The exponent η for the temperature dependence of the self-broadening coefficient of carbon monoxide has been measured directly using a tunable diode laser spectrometer. For lines of 12C16O between P(25) and P(31), the exponent has a value of 0.66 ± 0.05. For the P(13) and P(16) lines of 13C16O, the exponent appears to be the same. These results show that the value of η is less than the generally accepted value of 0.75 for temperatures between ambient and 180°C.

© 1981 Optical Society of America

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References

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  1. R. T. Pack, J. Chem. Phys. 70, 3424 (1979).
    [Crossref]
  2. R. S. Eng, A. W. Mantz, J. Mol. Spectrosc. 74, 331 (1979).
    [Crossref]
  3. W. G. Planet, G. L. Tettemer, J. S. Knoll, J. Quant. Spectrosc. Radiat. Transfer 20, 547 (1978).
    [Crossref]
  4. W. G. Planet, G. L. Tettemer, J. Quant. Spectrosc. Radiat. Transfer 22, 345 (1979).
    [Crossref]
  5. J. N-P. Sun, M. L. Olson, D. L. Grieble, P. R. Griffiths, Appl. Opt., 19, 2762 (1980).
    [Crossref] [PubMed]
  6. D. L. Grieble, P. R. Griffiths, Appl. Spectrosc. 33, 640 (1979).
    [Crossref]
  7. E. E. Whiting, J. Quant. Spectrosc. Radiat. Transfer 8, 1379 (1968).
    [Crossref]
  8. R. H. Hunt, R. A. Toth, E. K. Plyler, J. Chem. Phys. 49, 3909 (1968).
    [Crossref]
  9. N. I. Moskalenko, Opt. Spectrosc. 38, 382 (1975).
  10. J. P. Bouanich, C. Brodbeck, J. Quant. Spectrosc. Radiat. Transfer 13, 1 (1973).
    [Crossref]

1980 (1)

1979 (4)

D. L. Grieble, P. R. Griffiths, Appl. Spectrosc. 33, 640 (1979).
[Crossref]

R. T. Pack, J. Chem. Phys. 70, 3424 (1979).
[Crossref]

R. S. Eng, A. W. Mantz, J. Mol. Spectrosc. 74, 331 (1979).
[Crossref]

W. G. Planet, G. L. Tettemer, J. Quant. Spectrosc. Radiat. Transfer 22, 345 (1979).
[Crossref]

1978 (1)

W. G. Planet, G. L. Tettemer, J. S. Knoll, J. Quant. Spectrosc. Radiat. Transfer 20, 547 (1978).
[Crossref]

1975 (1)

N. I. Moskalenko, Opt. Spectrosc. 38, 382 (1975).

1973 (1)

J. P. Bouanich, C. Brodbeck, J. Quant. Spectrosc. Radiat. Transfer 13, 1 (1973).
[Crossref]

1968 (2)

E. E. Whiting, J. Quant. Spectrosc. Radiat. Transfer 8, 1379 (1968).
[Crossref]

R. H. Hunt, R. A. Toth, E. K. Plyler, J. Chem. Phys. 49, 3909 (1968).
[Crossref]

Bouanich, J. P.

J. P. Bouanich, C. Brodbeck, J. Quant. Spectrosc. Radiat. Transfer 13, 1 (1973).
[Crossref]

Brodbeck, C.

J. P. Bouanich, C. Brodbeck, J. Quant. Spectrosc. Radiat. Transfer 13, 1 (1973).
[Crossref]

Eng, R. S.

R. S. Eng, A. W. Mantz, J. Mol. Spectrosc. 74, 331 (1979).
[Crossref]

Grieble, D. L.

Griffiths, P. R.

Hunt, R. H.

R. H. Hunt, R. A. Toth, E. K. Plyler, J. Chem. Phys. 49, 3909 (1968).
[Crossref]

Knoll, J. S.

W. G. Planet, G. L. Tettemer, J. S. Knoll, J. Quant. Spectrosc. Radiat. Transfer 20, 547 (1978).
[Crossref]

Mantz, A. W.

R. S. Eng, A. W. Mantz, J. Mol. Spectrosc. 74, 331 (1979).
[Crossref]

Moskalenko, N. I.

N. I. Moskalenko, Opt. Spectrosc. 38, 382 (1975).

Olson, M. L.

Pack, R. T.

R. T. Pack, J. Chem. Phys. 70, 3424 (1979).
[Crossref]

Planet, W. G.

W. G. Planet, G. L. Tettemer, J. Quant. Spectrosc. Radiat. Transfer 22, 345 (1979).
[Crossref]

W. G. Planet, G. L. Tettemer, J. S. Knoll, J. Quant. Spectrosc. Radiat. Transfer 20, 547 (1978).
[Crossref]

Plyler, E. K.

R. H. Hunt, R. A. Toth, E. K. Plyler, J. Chem. Phys. 49, 3909 (1968).
[Crossref]

Sun, J. N-P.

Tettemer, G. L.

W. G. Planet, G. L. Tettemer, J. Quant. Spectrosc. Radiat. Transfer 22, 345 (1979).
[Crossref]

W. G. Planet, G. L. Tettemer, J. S. Knoll, J. Quant. Spectrosc. Radiat. Transfer 20, 547 (1978).
[Crossref]

Toth, R. A.

R. H. Hunt, R. A. Toth, E. K. Plyler, J. Chem. Phys. 49, 3909 (1968).
[Crossref]

Whiting, E. E.

E. E. Whiting, J. Quant. Spectrosc. Radiat. Transfer 8, 1379 (1968).
[Crossref]

Appl. Opt. (1)

Appl. Spectrosc. (1)

J. Chem. Phys. (2)

R. H. Hunt, R. A. Toth, E. K. Plyler, J. Chem. Phys. 49, 3909 (1968).
[Crossref]

R. T. Pack, J. Chem. Phys. 70, 3424 (1979).
[Crossref]

J. Mol. Spectrosc. (1)

R. S. Eng, A. W. Mantz, J. Mol. Spectrosc. 74, 331 (1979).
[Crossref]

J. Quant. Spectrosc. Radiat. Transfer (4)

W. G. Planet, G. L. Tettemer, J. S. Knoll, J. Quant. Spectrosc. Radiat. Transfer 20, 547 (1978).
[Crossref]

W. G. Planet, G. L. Tettemer, J. Quant. Spectrosc. Radiat. Transfer 22, 345 (1979).
[Crossref]

E. E. Whiting, J. Quant. Spectrosc. Radiat. Transfer 8, 1379 (1968).
[Crossref]

J. P. Bouanich, C. Brodbeck, J. Quant. Spectrosc. Radiat. Transfer 13, 1 (1973).
[Crossref]

Opt. Spectrosc. (1)

N. I. Moskalenko, Opt. Spectrosc. 38, 382 (1975).

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Figures (6)

Fig. 1
Fig. 1

Appearance of spectra with and without CO present in the beam (upper trace) in the presence of a shift and (lower trace) after shifting the sample spectrum by nine data points (0.0031 cm−1).

Fig. 2
Fig. 2

A, Measured spectrum; B, Lorentzian curve giving the best fit to the right-hand side of the measured spectrum; C result of subtracting B from A, ordinate expanded by a factor of 5.

Fig. 3
Fig. 3

P(25) line of CO at Pressures from 50 to 500 Torr at intervals of 50 Torr.

Fig. 4
Fig. 4

Plot of γc against for the P(27) line of CO at temperatures from ambient to 180°C at intervals of 20°C.

Fig. 5
Fig. 5

Collision halfwidth of CO lines from P(25) to P(33) at 760 Torr and ambient temperature as reported by Moskalenko,9 -·-◬-·-, Hunt et al.,8 —×—; and this work, ---⊙---.

Fig. 6
Fig. 6

Plot of lnα vs lnT for the P(27) line of CO.

Tables (4)

Tables Icon

Table I Self-broadening Coefficients, α mcm−1/atm, and Standard Deviations σ for the P(25), P(26), P(27), P(29), and P(31) Lines of 12C16O.

Tables Icon

Table II Best Fit Values of η, the Exponent of the Temperature Dependence of α, for Selected Lines of 12C16O and 13C16O

Tables Icon

Table III Calculated Best Fit Coefficients, A, B, and C, to Eq. (3) for the P(25), P(26), P(27), P(29), and P(31) Lines of 12C16O

Tables Icon

Table IV Self-broadening Coefficients, α mcm−1/atm, for the P(9), P(13), and P(16) Lines of 13C18O

Equations (4)

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γ = γ 0 ( P P 0 ) ( T 0 T ) η ,
α = γ P = α 0 ( T 0 T ) η .
γ = A T 1 + B + C T ,
γ H = γ C 2 + ( γ C 2 4 + γ D 2 ) 1 / 2 .

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