Abstract

A critical angle refractometer for liquids in the infrared is described. Arsenic trisulfide prisms are used. In determining the critical angle of refraction, the influence of fringes formed in the thin sample layer is taken into account. Dispersion data are presented for six solvents in the 1–6 μ region. A summary is given of the sources of published data on the infrared dispersion of solvents.

© 1957 Optical Society of America

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References

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  1. R. J. W. Le Fèvre, Dipole Moments (Methuen and Company, Ltd., London, 1953).
  2. J. H. Jaffe and S. Kimel, J. Chem. Phys. 25, 374 (1956).
    [Crossref]
  3. J. H. Jaffe, J. Opt. Soc. Am. 41, 166 (1951).
    [Crossref]
  4. J. H. Jaffe and U. Oppenheim, Bull. Research Council Israel 2, 297 (1952).
  5. The prisms were obtained from the Servo Corporation of America, 20–20 Jericho Turnpike, New Hyde Park, New York. For a physical description of arsenic trisulfide see R. Frerichs, J. Opt. Soc. Am. 43, 1153 (1953).
    [Crossref]
  6. Rayleigh, Scientific Papers (Cambridge University Press, New York, 1900), Vol. III, p. 309.
  7. R. W. Wood, Physical Optics (The Macmillan Company, New York, 1948), p. 418.
  8. P. L. Leurgans and A. F. Turner, J. Opt. Soc. Am. 37, 983 (1947).

1956 (1)

J. H. Jaffe and S. Kimel, J. Chem. Phys. 25, 374 (1956).
[Crossref]

1953 (1)

1952 (1)

J. H. Jaffe and U. Oppenheim, Bull. Research Council Israel 2, 297 (1952).

1951 (1)

1947 (1)

P. L. Leurgans and A. F. Turner, J. Opt. Soc. Am. 37, 983 (1947).

Frerichs, R.

Jaffe, J. H.

J. H. Jaffe and S. Kimel, J. Chem. Phys. 25, 374 (1956).
[Crossref]

J. H. Jaffe and U. Oppenheim, Bull. Research Council Israel 2, 297 (1952).

J. H. Jaffe, J. Opt. Soc. Am. 41, 166 (1951).
[Crossref]

Kimel, S.

J. H. Jaffe and S. Kimel, J. Chem. Phys. 25, 374 (1956).
[Crossref]

Le Fèvre, R. J. W.

R. J. W. Le Fèvre, Dipole Moments (Methuen and Company, Ltd., London, 1953).

Leurgans, P. L.

P. L. Leurgans and A. F. Turner, J. Opt. Soc. Am. 37, 983 (1947).

Oppenheim, U.

J. H. Jaffe and U. Oppenheim, Bull. Research Council Israel 2, 297 (1952).

Rayleigh,

Rayleigh, Scientific Papers (Cambridge University Press, New York, 1900), Vol. III, p. 309.

Turner, A. F.

P. L. Leurgans and A. F. Turner, J. Opt. Soc. Am. 37, 983 (1947).

Wood, R. W.

R. W. Wood, Physical Optics (The Macmillan Company, New York, 1948), p. 418.

Bull. Research Council Israel (1)

J. H. Jaffe and U. Oppenheim, Bull. Research Council Israel 2, 297 (1952).

J. Chem. Phys. (1)

J. H. Jaffe and S. Kimel, J. Chem. Phys. 25, 374 (1956).
[Crossref]

J. Opt. Soc. Am. (3)

Other (3)

Rayleigh, Scientific Papers (Cambridge University Press, New York, 1900), Vol. III, p. 309.

R. W. Wood, Physical Optics (The Macmillan Company, New York, 1948), p. 418.

R. J. W. Le Fèvre, Dipole Moments (Methuen and Company, Ltd., London, 1953).

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Figures (4)

Fig. 1
Fig. 1

Arrangement of the infrared refractometer. G, light source; P1 and P2, off-axis parabolic mirrors; B, prism block on divided circle; M, plane mirror; S, entrance slit of monochromator.

Fig. 2
Fig. 2

(a) Transmittance at an interface between optical media having refractive indexes 2.4 and 1.4, respectively. The critical angle is 35°41′, indicated by the broken line. (b) Transmittance of a dielectric layer of refractive index 1.4 situated between media of index 2.4. The ratio of the thickness s to the wavelength λ is 3. (c) As (b), with s/λ=0.5.

Fig. 3
Fig. 3

Dispersion of n-heptane in the 1–6 μ region (at 21.5°C).

Fig. 4
Fig. 4

Dispersion of cyclohexane in the 1–6 μ region (at 21.5°C).

Tables (3)

Tables Icon

Table I Refractive indexes of arsenic trisulfide glass in the 1–6 μ region (at 21.5°C).

Tables Icon

Table II Refractive indexes of six solvents in the 1–6 μ region (at 21.5°C). The estimated accuracy is ±0.0003.

Tables Icon

Table III Summary of the published information on the infrared dispersion of commonly used solvents.