Abstract

Room temperature argon broadened halfwidth and pressure-induced line shift coefficients have been determined for 118 transitions in the ν4 band of 12CH4 from analysis of high resolution laboratory absorption spectra recorded with the McMath Fourier transform spectrometer operated on Kitt Peak by the National Solar Observatory. Transitions up to J″ = 12 have been measured using a nonlinear least-squares spectral fitting procedure. The variation of the measured halfwidth coefficients with symmetry type and rotational quantum number is very similar to that measured previously for N2 and air broadening, but the absolute values of the argon broadening coefficients are all smaller. On average, the ratio of the argon broadened halfwidth coefficient to the corresponding N2 broadened halfwidth coefficient is 0.877 ± 0.017 (2σ). More than 95% of the pressure-induced shifts are negative with values ranging from −0.0081 to +0.0055 cm−1 atm−1. The pressure shifts in argon are nearly equal to corresponding values measured previously in N2 and air.

© 1989 Optical Society of America

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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  3. C. P. Rinsland, V. Malathy Devi, M. A. H. Smith, D. C. Benner, “Measurements of Air-Broadened and Nitrogen-Broadened Lorentz Width Coefficients and Pressure Shift Coefficients in the ν4 and ν2 Bands of 12CH4,” Appl. Opt. 27, 631–651 (1988).
    [CrossRef] [PubMed]
  4. V. Malathy Devi, C. P. Rinsland, M. A. H. Smith, D. C. Benner, “Air-Broadened Lorentz Halfwidths and Pressure-Induced Line Shifts in the ν4 Band of 13CH4,” Appl. Opt. 27, 2296–2308 (1988).
    [CrossRef]
  5. D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.
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  8. C. P. Rinsland, D. C. Benner, D. J. Richardson, R. A. Toth, “Absolute Intensity Measurements of the (1110)II ← 0000 Band of 12C16O2 at 5.2 μm,” Appl. Opt. 22, 3805–3809 (1983).
    [CrossRef] [PubMed]
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    [CrossRef]
  11. P. Varanasi, S. Chudamani, “Measurements of Collision-Broadened Line Widths in the ν4-Fundamental Band of 12CH4 at Low Temperatures,” J. Quant. Spectrosc. Radiat. Transfer, in press.
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    [CrossRef] [PubMed]
  13. P. Varanasi, S. Chudamani, “Intensity and Line Width Measurements in the ν4-Fundamental Band of 13CH4,” J. Geophys. Res., in press.
  14. K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
    [CrossRef]
  15. H. J. Gerritsen, M. E. Heller, “High-Resolution Tuned-Laser Spectroscope,” Appl. Opt. Suppl. 2, 73–77 (1965).
  16. M. A. H. Smith, C. P. Rinsland, B. Fridovich, K. Narahari Rao, “Intensities and Collision Broadening Parameters from Infrared Spectra,” in Molecular Spectroscopy: Modern Research, Vol. 3, K. Narahari Rao, Ed. (Academic, Orlando, FL, 1985), Chap. 3.
  17. G. D. T. Tejwani, P. Varanasi, K. Fox, “Collision-Broadened Linewidths of Tetrahedral Molecules-II. Computations for CH4 Lines Broadened by N2, O2, He, Ne and Ar,” J. Quant. Spectrosc. Radiat. Transfer 15, 243–254 (1975).
    [CrossRef]
  18. P. Varanasi, “Collision-Broadened Line Widths of Tetrahedral Molecules—I. Theoretical Formulation,” J. Quant. Spectrosc. Radiat. Transfer 14, 995–1008 (1974).
    [CrossRef]
  19. P. Varanasi, “Infrared Line Widths at Planetary Atmospheric Temperatures,” J. Quant. Spectrosc. Radiat. Transfer 39, 13–25 (1988).
    [CrossRef]

1988 (4)

K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
[CrossRef]

P. Varanasi, “Infrared Line Widths at Planetary Atmospheric Temperatures,” J. Quant. Spectrosc. Radiat. Transfer 39, 13–25 (1988).
[CrossRef]

C. P. Rinsland, V. Malathy Devi, M. A. H. Smith, D. C. Benner, “Measurements of Air-Broadened and Nitrogen-Broadened Lorentz Width Coefficients and Pressure Shift Coefficients in the ν4 and ν2 Bands of 12CH4,” Appl. Opt. 27, 631–651 (1988).
[CrossRef] [PubMed]

V. Malathy Devi, C. P. Rinsland, M. A. H. Smith, D. C. Benner, “Air-Broadened Lorentz Halfwidths and Pressure-Induced Line Shifts in the ν4 Band of 13CH4,” Appl. Opt. 27, 2296–2308 (1988).
[CrossRef]

1987 (1)

1985 (3)

1983 (1)

1975 (1)

G. D. T. Tejwani, P. Varanasi, K. Fox, “Collision-Broadened Linewidths of Tetrahedral Molecules-II. Computations for CH4 Lines Broadened by N2, O2, He, Ne and Ar,” J. Quant. Spectrosc. Radiat. Transfer 15, 243–254 (1975).
[CrossRef]

1974 (2)

P. Varanasi, “Collision-Broadened Line Widths of Tetrahedral Molecules—I. Theoretical Formulation,” J. Quant. Spectrosc. Radiat. Transfer 14, 995–1008 (1974).
[CrossRef]

P. Varanasi, L. A. Pugh, B. R. P. Bangaru, “Measurement of Multiplet Intensities and Noble Gas-Broadened Line Widths in the ν4-Fundamental of Methane,” J. Quant. Spectrosc. Radiat. Transfer 14, 829–838 (1974).
[CrossRef]

1965 (1)

H. J. Gerritsen, M. E. Heller, “High-Resolution Tuned-Laser Spectroscope,” Appl. Opt. Suppl. 2, 73–77 (1965).

Ballard, J.

C. R. Webster, S. Sander, R. Beer, J. Ballard, “Titan Probe Diode Laser Spectrometer,” in Proceedings, Atmospheric Spectroscopy Applications Workshop, Rutherford Appleton Laboratory, 1–3 Sept. 1987, J. Ballard, Ed., Rutherford Appleton Laboratory Publ. RAL-88-009 (1987), paper 12.5.

Bangaru, B. R. P.

P. Varanasi, L. A. Pugh, B. R. P. Bangaru, “Measurement of Multiplet Intensities and Noble Gas-Broadened Line Widths in the ν4-Fundamental of Methane,” J. Quant. Spectrosc. Radiat. Transfer 14, 829–838 (1974).
[CrossRef]

Beer, R.

C. R. Webster, S. Sander, R. Beer, J. Ballard, “Titan Probe Diode Laser Spectrometer,” in Proceedings, Atmospheric Spectroscopy Applications Workshop, Rutherford Appleton Laboratory, 1–3 Sept. 1987, J. Ballard, Ed., Rutherford Appleton Laboratory Publ. RAL-88-009 (1987), paper 12.5.

Benner, D. C.

Brown, L. R.

Chudamani, S.

P. Varanasi, S. Chudamani, “Intensity and Line Width Measurements in the ν4-Fundamental Band of 13CH4,” J. Geophys. Res., in press.

P. Varanasi, S. Chudamani, “Measurements of Collision-Broadened Line Widths in the ν4-Fundamental Band of 12CH4 at Low Temperatures,” J. Quant. Spectrosc. Radiat. Transfer, in press.

Flasar, F. M.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

Fox, K.

K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
[CrossRef]

G. D. T. Tejwani, P. Varanasi, K. Fox, “Collision-Broadened Linewidths of Tetrahedral Molecules-II. Computations for CH4 Lines Broadened by N2, O2, He, Ne and Ar,” J. Quant. Spectrosc. Radiat. Transfer 15, 243–254 (1975).
[CrossRef]

Fridovich, B.

M. A. H. Smith, C. P. Rinsland, B. Fridovich, K. Narahari Rao, “Intensities and Collision Broadening Parameters from Infrared Spectra,” in Molecular Spectroscopy: Modern Research, Vol. 3, K. Narahari Rao, Ed. (Academic, Orlando, FL, 1985), Chap. 3.

Gerritsen, H. J.

H. J. Gerritsen, M. E. Heller, “High-Resolution Tuned-Laser Spectroscope,” Appl. Opt. Suppl. 2, 73–77 (1965).

Heller, M. E.

H. J. Gerritsen, M. E. Heller, “High-Resolution Tuned-Laser Spectroscope,” Appl. Opt. Suppl. 2, 73–77 (1965).

Hubbard, R.

K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
[CrossRef]

Hunten, D. M.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

Jennings, D. E.

K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
[CrossRef]

Malathy Devi, V.

Narahari Rao, K.

M. A. H. Smith, C. P. Rinsland, B. Fridovich, K. Narahari Rao, “Intensities and Collision Broadening Parameters from Infrared Spectra,” in Molecular Spectroscopy: Modern Research, Vol. 3, K. Narahari Rao, Ed. (Academic, Orlando, FL, 1985), Chap. 3.

Pugh, L. A.

P. Varanasi, L. A. Pugh, B. R. P. Bangaru, “Measurement of Multiplet Intensities and Noble Gas-Broadened Line Widths in the ν4-Fundamental of Methane,” J. Quant. Spectrosc. Radiat. Transfer 14, 829–838 (1974).
[CrossRef]

Richardson, D. J.

Rinsland, C. P.

Rothman, L. S.

Samuelson, R. E.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

Sander, S.

C. R. Webster, S. Sander, R. Beer, J. Ballard, “Titan Probe Diode Laser Spectrometer,” in Proceedings, Atmospheric Spectroscopy Applications Workshop, Rutherford Appleton Laboratory, 1–3 Sept. 1987, J. Ballard, Ed., Rutherford Appleton Laboratory Publ. RAL-88-009 (1987), paper 12.5.

Smith, M. A. H.

Stern, E. A.

K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
[CrossRef]

Stevenson, D. J.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

Strobel, D. F.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

Tejwani, G. D. T.

G. D. T. Tejwani, P. Varanasi, K. Fox, “Collision-Broadened Linewidths of Tetrahedral Molecules-II. Computations for CH4 Lines Broadened by N2, O2, He, Ne and Ar,” J. Quant. Spectrosc. Radiat. Transfer 15, 243–254 (1975).
[CrossRef]

Tomasko, M. G.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

Toth, R. A.

Varanasi, P.

P. Varanasi, “Infrared Line Widths at Planetary Atmospheric Temperatures,” J. Quant. Spectrosc. Radiat. Transfer 39, 13–25 (1988).
[CrossRef]

G. D. T. Tejwani, P. Varanasi, K. Fox, “Collision-Broadened Linewidths of Tetrahedral Molecules-II. Computations for CH4 Lines Broadened by N2, O2, He, Ne and Ar,” J. Quant. Spectrosc. Radiat. Transfer 15, 243–254 (1975).
[CrossRef]

P. Varanasi, “Collision-Broadened Line Widths of Tetrahedral Molecules—I. Theoretical Formulation,” J. Quant. Spectrosc. Radiat. Transfer 14, 995–1008 (1974).
[CrossRef]

P. Varanasi, L. A. Pugh, B. R. P. Bangaru, “Measurement of Multiplet Intensities and Noble Gas-Broadened Line Widths in the ν4-Fundamental of Methane,” J. Quant. Spectrosc. Radiat. Transfer 14, 829–838 (1974).
[CrossRef]

P. Varanasi, S. Chudamani, “Intensity and Line Width Measurements in the ν4-Fundamental Band of 13CH4,” J. Geophys. Res., in press.

P. Varanasi, S. Chudamani, “Measurements of Collision-Broadened Line Widths in the ν4-Fundamental Band of 12CH4 at Low Temperatures,” J. Quant. Spectrosc. Radiat. Transfer, in press.

Webster, C. R.

C. R. Webster, S. Sander, R. Beer, J. Ballard, “Titan Probe Diode Laser Spectrometer,” in Proceedings, Atmospheric Spectroscopy Applications Workshop, Rutherford Appleton Laboratory, 1–3 Sept. 1987, J. Ballard, Ed., Rutherford Appleton Laboratory Publ. RAL-88-009 (1987), paper 12.5.

C. R. Webster, “Stratospheric Composition Measurements of Earth and Titan Using High-Resolution Tunable Diode Laser Spectroscopy,” J. Quant. Spectrosc. Radiat. Transfer, in press.

Appl. Opt. (6)

Appl. Opt. Suppl. (1)

H. J. Gerritsen, M. E. Heller, “High-Resolution Tuned-Laser Spectroscope,” Appl. Opt. Suppl. 2, 73–77 (1965).

J. Opt. Soc. Am. B (1)

J. Quant. Spectrosc. Radiat. Transfer (5)

P. Varanasi, L. A. Pugh, B. R. P. Bangaru, “Measurement of Multiplet Intensities and Noble Gas-Broadened Line Widths in the ν4-Fundamental of Methane,” J. Quant. Spectrosc. Radiat. Transfer 14, 829–838 (1974).
[CrossRef]

G. D. T. Tejwani, P. Varanasi, K. Fox, “Collision-Broadened Linewidths of Tetrahedral Molecules-II. Computations for CH4 Lines Broadened by N2, O2, He, Ne and Ar,” J. Quant. Spectrosc. Radiat. Transfer 15, 243–254 (1975).
[CrossRef]

P. Varanasi, “Collision-Broadened Line Widths of Tetrahedral Molecules—I. Theoretical Formulation,” J. Quant. Spectrosc. Radiat. Transfer 14, 995–1008 (1974).
[CrossRef]

P. Varanasi, “Infrared Line Widths at Planetary Atmospheric Temperatures,” J. Quant. Spectrosc. Radiat. Transfer 39, 13–25 (1988).
[CrossRef]

K. Fox, D. E. Jennings, E. A. Stern, R. Hubbard, “Measurements of Argon-, Helium-, Hydrogen-, and Nitrogen-Broadened Widths of Methane Lines near 9000 cm−1,” J. Quant. Spectrosc. Radiat. Transfer 39, 473–476 (1988).
[CrossRef]

Other (6)

M. A. H. Smith, C. P. Rinsland, B. Fridovich, K. Narahari Rao, “Intensities and Collision Broadening Parameters from Infrared Spectra,” in Molecular Spectroscopy: Modern Research, Vol. 3, K. Narahari Rao, Ed. (Academic, Orlando, FL, 1985), Chap. 3.

P. Varanasi, S. Chudamani, “Intensity and Line Width Measurements in the ν4-Fundamental Band of 13CH4,” J. Geophys. Res., in press.

P. Varanasi, S. Chudamani, “Measurements of Collision-Broadened Line Widths in the ν4-Fundamental Band of 12CH4 at Low Temperatures,” J. Quant. Spectrosc. Radiat. Transfer, in press.

D. M. Hunten, M. G. Tomasko, F. M. Flasar, R. E. Samuelson, D. F. Strobel, D. J. Stevenson, “Titan,” in Saturn, T. Gehrels, M. S. Matthews, Eds. (U. Arizona Press, Tucson, 1984), pp. 671–759.

C. R. Webster, S. Sander, R. Beer, J. Ballard, “Titan Probe Diode Laser Spectrometer,” in Proceedings, Atmospheric Spectroscopy Applications Workshop, Rutherford Appleton Laboratory, 1–3 Sept. 1987, J. Ballard, Ed., Rutherford Appleton Laboratory Publ. RAL-88-009 (1987), paper 12.5.

C. R. Webster, “Stratospheric Composition Measurements of Earth and Titan Using High-Resolution Tunable Diode Laser Spectroscopy,” J. Quant. Spectrosc. Radiat. Transfer, in press.

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