Abstract

It has been shown that crystals whose particle-size is small in comparison with the wave-length absorb but do not reflect within the region of selective absorption. It is suggested that within this region a powder ought to reveal an emission maximum. This suggestion is put to experimental test which shows that powder-films of quartz, barium sulphate and potassium carbonate show pronounced emission maxima. The behavior of quartz-powder is shown to be quite the inverse of that of a polished quartz plate.

© 1933 Optical Society of America

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References

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  1. A. H. Pfund, Phys. Rev. 36, 71 (1930).
    [Crossref]
  2. A. H. Pfund and S. Silverman, Phys. Rev. 39, 64 (1932).
    [Crossref]
  3. Pfund and Silverman, reference 2, p. 71.
  4. Schaefer and Matossi, Das Ultrarote Spectrum, p. 343, (1930).
  5. Pfund and Silverman, reference 2. While it is true that the radiometric effects were obtained with unheated powders, it is to be borne in mind that, for crystalline materials, a rise in temperature produces only a small shift in the positions of reflection (and, probably) absorption maxima. See H. Rubens and Hertz, Berl. Ber., p. 256 (1908); A. H. Pfund, J. O. S. A. 15, 71 (1927).
    [Crossref]
  6. H. Rosenthal, Ann. d. Physik 68, 783 (1899).
    [Crossref]
  7. A. H. Pfund, reference 5.

1932 (1)

A. H. Pfund and S. Silverman, Phys. Rev. 39, 64 (1932).
[Crossref]

1930 (2)

Schaefer and Matossi, Das Ultrarote Spectrum, p. 343, (1930).

A. H. Pfund, Phys. Rev. 36, 71 (1930).
[Crossref]

1899 (1)

H. Rosenthal, Ann. d. Physik 68, 783 (1899).
[Crossref]

Matossi,

Schaefer and Matossi, Das Ultrarote Spectrum, p. 343, (1930).

Pfund,

Pfund and Silverman, reference 2. While it is true that the radiometric effects were obtained with unheated powders, it is to be borne in mind that, for crystalline materials, a rise in temperature produces only a small shift in the positions of reflection (and, probably) absorption maxima. See H. Rubens and Hertz, Berl. Ber., p. 256 (1908); A. H. Pfund, J. O. S. A. 15, 71 (1927).
[Crossref]

Pfund and Silverman, reference 2, p. 71.

Pfund, A. H.

A. H. Pfund and S. Silverman, Phys. Rev. 39, 64 (1932).
[Crossref]

A. H. Pfund, Phys. Rev. 36, 71 (1930).
[Crossref]

A. H. Pfund, reference 5.

Rosenthal, H.

H. Rosenthal, Ann. d. Physik 68, 783 (1899).
[Crossref]

Schaefer,

Schaefer and Matossi, Das Ultrarote Spectrum, p. 343, (1930).

Silverman,

Pfund and Silverman, reference 2. While it is true that the radiometric effects were obtained with unheated powders, it is to be borne in mind that, for crystalline materials, a rise in temperature produces only a small shift in the positions of reflection (and, probably) absorption maxima. See H. Rubens and Hertz, Berl. Ber., p. 256 (1908); A. H. Pfund, J. O. S. A. 15, 71 (1927).
[Crossref]

Pfund and Silverman, reference 2, p. 71.

Silverman, S.

A. H. Pfund and S. Silverman, Phys. Rev. 39, 64 (1932).
[Crossref]

Ann. d. Physik (1)

H. Rosenthal, Ann. d. Physik 68, 783 (1899).
[Crossref]

Das Ultrarote Spectrum (1)

Schaefer and Matossi, Das Ultrarote Spectrum, p. 343, (1930).

Phys. Rev. (2)

A. H. Pfund, Phys. Rev. 36, 71 (1930).
[Crossref]

A. H. Pfund and S. Silverman, Phys. Rev. 39, 64 (1932).
[Crossref]

Other (3)

Pfund and Silverman, reference 2, p. 71.

Pfund and Silverman, reference 2. While it is true that the radiometric effects were obtained with unheated powders, it is to be borne in mind that, for crystalline materials, a rise in temperature produces only a small shift in the positions of reflection (and, probably) absorption maxima. See H. Rubens and Hertz, Berl. Ber., p. 256 (1908); A. H. Pfund, J. O. S. A. 15, 71 (1927).
[Crossref]

A. H. Pfund, reference 5.

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Figures (5)

Fig. 1
Fig. 1

Diagram of apparatus.

Fig. 2
Fig. 2

Emissive powers of powder-films at 900°K, (A) quartz, (B) barium sulphate, (C) potassium carbonate.

Fig. 3
Fig. 3

Emissive powers of quartz powder-films, (A) thin, (B) medium, (C) thick.

Fig. 4
Fig. 4

Emissive power of flake of Pyrex glass.

Fig. 5
Fig. 5

Emissive powers: (A) Rosenthal’s curve for a polished quartz plate, (B) quartz powder-film.

Equations (1)

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I s = I 0 K ( d 6 / λ 4 )