Abstract

The near-normal incidence spectral reflectance R(ν) of liquid methane at 98 K has been measured in the infrared in the spectral range 6700–350 cm−1. The resulting values of R(ν) have been subjected to Kramers-Kronig phase-shift analysis to provide values of the real n(ν) and imaginary k(ν) parts of the complex index of refraction N(ν) = n(ν) + ik(ν) in the range 4000–400 cm−1. The results of the present study are presented in graphical form and in tabular form over this range. The strengths S = ∫k(ν) of the absorption bands are compared with the corresponding bands in gaseous methane. Techniques for using the present results to obtain approximate values of the corresponding optical constants of solid methane are discussed.

© 1978 Optical Society of America

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References

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  1. C. W. Robertson and D. Williams, “Optical constants of liquid ammonia in the infrared,” J. Opt. Soc. Am. 63, 188–193 (1973).
    [Crossref]
  2. H. D. Downing, L. W. Pinkley, P. P. Sethna, and D. Williams, “Optical constants of ammonium sulfate in the infrared,” J. Opt. Soc. Am. 67, 186–190 (1977); P. P. Sethna, L. W. Pinkley, and D. Williams, “Optical constants of cupric sulfate in the infrared”, J. Opt. Soc. Am. 67, 499–501 (1977).
    [Crossref]
  3. G. Herzberg, Molecular Spectra and Molecular Structure (Van Nostrand, New York, 1945), p. 307.
  4. G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
    [Crossref]
  5. H. D. Downing and D. Williams, “Optical Constants of Water in the Infrared,” J. Geophys. Res. 80, 1656–1661 (1975).
    [Crossref]
  6. D. E. Burch and D. Williams, “Total Absorptance of Carbon Monoxide and Methane in the Infrared,” Appl. Opt. 1, 587–593 (1962).
    [Crossref]

1977 (1)

1975 (2)

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

H. D. Downing and D. Williams, “Optical Constants of Water in the Infrared,” J. Geophys. Res. 80, 1656–1661 (1975).
[Crossref]

1973 (1)

1962 (1)

Amiot, C.

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

Burch, D. E.

Dang-Nhu, M.

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

Downing, H. D.

Guelachvili, G.

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

Herzberg, G.

G. Herzberg, Molecular Spectra and Molecular Structure (Van Nostrand, New York, 1945), p. 307.

Pinkley, L. W.

Poussigue, G.

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

Robertson, C. W.

Sethna, P. P.

Tarrago, G.

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

Williams, D.

Appl. Opt. (1)

J. Geophys. Res. (1)

H. D. Downing and D. Williams, “Optical Constants of Water in the Infrared,” J. Geophys. Res. 80, 1656–1661 (1975).
[Crossref]

J. Mol. Spctrosc. (1)

G. Tarrago, M. Dang-Nhu, G. Poussigue, G. Guelachvili, and C. Amiot, “Ground State of Methane 12CH4 through Forbidden Lines of the ν3 Band,” J. Mol. Spctrosc. 57, 246–263 (1975).
[Crossref]

J. Opt. Soc. Am. (2)

Other (1)

G. Herzberg, Molecular Spectra and Molecular Structure (Van Nostrand, New York, 1945), p. 307.

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Figures (3)

FIG. 1
FIG. 1

Spectral reflectance R(ν) of liquid methane at 98 K as a function of wave number cm−1.

FIG. 2
FIG. 2

Refractive index n(ν) of liquid methane at 98 K as a function of wave number cm−1.

FIG. 3
FIG. 3

Absorption index k(ν) of liquid methane at 98 K as a function of wave number cm−1.

Tables (2)

Tables Icon

TABLE I Optical constants of liquid methane in the infrared.

Tables Icon

TABLE II Comparison of absorption of methane in the gas and liquid phasesa,b.