Abstract

The refractive indices of a 31° prism of silver chloride were measured at 30 wave-lengths at a constant room temperature of 23.9°C, from 0.578 to 20.6μ by use of a minimum-deviation spectrometer and a Perkin-Elmer infra-red spectrometer equipped with a calibrated screw for operation of the Littrow mirror. A cadmium-mercury lamp was the source from 1 to 2μ. From 2 to 20μ a Globar was used as the source with various Baird’s reflection interference filters and the absorption bands of carbon dioxide, carbon disulfide, water, methylcyclohexane, polystyrene, trichlorobenzene, and chlorobenzotrifluoride for the identification of wave-lengths. In the visible region two prisms, one pressed and polished, the other sawed and lapped, were used and the results compared. The sensitivity of index to temperature is approximately −6.1 × 10−5 per centigrade degree for wave-length 0.610μ.

© 1950 Optical Society of America

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References

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  1. L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Research Nat. Bur. Stand. 43, 81 (1949).
    [Crossref]
  2. Reference 1, p. 84.

1949 (1)

L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Research Nat. Bur. Stand. 43, 81 (1949).
[Crossref]

Plyler, E. K.

L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Research Nat. Bur. Stand. 43, 81 (1949).
[Crossref]

Stephens, R. E.

L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Research Nat. Bur. Stand. 43, 81 (1949).
[Crossref]

Tilton, L. W.

L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Research Nat. Bur. Stand. 43, 81 (1949).
[Crossref]

J. Research Nat. Bur. Stand. (1)

L. W. Tilton, E. K. Plyler, and R. E. Stephens, J. Research Nat. Bur. Stand. 43, 81 (1949).
[Crossref]

Other (1)

Reference 1, p. 84.

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Figures (5)

Fig. 1
Fig. 1

Diagram showing installation of prism, P, on infra-red spectrometer. S represents the source, D the Golay detector, C the collimating mirror, M the Littrow mirror, and a an auxiliary prism for use in mounting the prism P for a definite angle of incidence.

Fig. 2
Fig. 2

Simplified relation of Littrow mirror, M, to deviation, D, and angle of emergence, E, produced by prism with angle, A, when light is incident at fixed angle i.

Fig. 3
Fig. 3

Infra-red emission spectrum of mercury; silver chloride prism. An increment of 10 in drum reading (0.10 turn of screw) corresponds to an orientation of 162 seconds of the Littrow mirror.

Fig. 4
Fig. 4

Comparison of observed and computed indices of AgCl and evaluation of systematic error between visual and infra-red determinations.

Fig. 5
Fig. 5

Comparison of NBS indices of AgCl with previously reported values. The plotted values for Schröter’s data were computed from his equation [Zeits. f. Physik 67, 24 (1931)]. The values of Nielson and of Hyde were taken from the curves on p. 39 of “Infra-red optical materials” by Baird Associates, Inc. (1949).

Tables (2)

Tables Icon

Table I Observed and computed data on index of refraction of AgCl (23.9°C).

Tables Icon

Table II Refractive index of AgCl at 23.9°C.

Equations (3)

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cot i = cot A + ( sin E / sin A sin i )
n = sin i ( 1 + cot 2 i ) 1 2 ,
n 2 = 4.00804 - 0.00085111 λ 2 - 0.00000019762 λ 4 + 0.079086 / ( λ 2 - 0.04584 ) .