Abstract

A simple filtering system, involving the use of only two simply constructed selenium powder filters, is described, by the use of which it is possible to obtain a pure energy spectrum with a wire grating spectrometer in the region 40–130μ. In addition transmission curves are given for a number of substances in the regions 1–15μ and 35–130μ.

© 1936 Optical Society of America

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References

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  1. R. B. Barnes, Rev. Sci. Inst. 5, 237 (1934).
    [CrossRef]
  2. R. B. Barnes, R. R. Brattain, and F. Seitz, Phys. Rev. 48, 582 (1935).
    [CrossRef]
  3. Filters of this type were first described by Pfund (A. H. Pfund, Phys. Rev. 36, 71 (1930)).
    [CrossRef]
  4. R. B. Barnes and L. G. Bonner, Phys. Rev. 49, 732 (1936).
    [CrossRef]
  5. A. H. Pfund, J. O. S. A. 23, 375 (1933).
    [CrossRef]
  6. M. Czerny, Zeits. f. Physik 65, 600 (1930).
    [CrossRef]
  7. A. H. Pfund, Science 82, 597 (1935).
    [CrossRef] [PubMed]
  8. L. R. Ingersoll, J. G. Winans, and E. H. Krause, J. O. S. A. 26, 233 (1936); J. Strong, J. O. S. A. 26, 256 (1936).
    [CrossRef]

1936 (2)

R. B. Barnes and L. G. Bonner, Phys. Rev. 49, 732 (1936).
[CrossRef]

L. R. Ingersoll, J. G. Winans, and E. H. Krause, J. O. S. A. 26, 233 (1936); J. Strong, J. O. S. A. 26, 256 (1936).
[CrossRef]

1935 (2)

A. H. Pfund, Science 82, 597 (1935).
[CrossRef] [PubMed]

R. B. Barnes, R. R. Brattain, and F. Seitz, Phys. Rev. 48, 582 (1935).
[CrossRef]

1934 (1)

R. B. Barnes, Rev. Sci. Inst. 5, 237 (1934).
[CrossRef]

1933 (1)

A. H. Pfund, J. O. S. A. 23, 375 (1933).
[CrossRef]

1930 (2)

M. Czerny, Zeits. f. Physik 65, 600 (1930).
[CrossRef]

Filters of this type were first described by Pfund (A. H. Pfund, Phys. Rev. 36, 71 (1930)).
[CrossRef]

Barnes, R. B.

R. B. Barnes and L. G. Bonner, Phys. Rev. 49, 732 (1936).
[CrossRef]

R. B. Barnes, R. R. Brattain, and F. Seitz, Phys. Rev. 48, 582 (1935).
[CrossRef]

R. B. Barnes, Rev. Sci. Inst. 5, 237 (1934).
[CrossRef]

Bonner, L. G.

R. B. Barnes and L. G. Bonner, Phys. Rev. 49, 732 (1936).
[CrossRef]

Brattain, R. R.

R. B. Barnes, R. R. Brattain, and F. Seitz, Phys. Rev. 48, 582 (1935).
[CrossRef]

Czerny, M.

M. Czerny, Zeits. f. Physik 65, 600 (1930).
[CrossRef]

Ingersoll, L. R.

L. R. Ingersoll, J. G. Winans, and E. H. Krause, J. O. S. A. 26, 233 (1936); J. Strong, J. O. S. A. 26, 256 (1936).
[CrossRef]

Krause, E. H.

L. R. Ingersoll, J. G. Winans, and E. H. Krause, J. O. S. A. 26, 233 (1936); J. Strong, J. O. S. A. 26, 256 (1936).
[CrossRef]

Pfund, A. H.

A. H. Pfund, Science 82, 597 (1935).
[CrossRef] [PubMed]

A. H. Pfund, J. O. S. A. 23, 375 (1933).
[CrossRef]

Filters of this type were first described by Pfund (A. H. Pfund, Phys. Rev. 36, 71 (1930)).
[CrossRef]

Seitz, F.

R. B. Barnes, R. R. Brattain, and F. Seitz, Phys. Rev. 48, 582 (1935).
[CrossRef]

Winans, J. G.

L. R. Ingersoll, J. G. Winans, and E. H. Krause, J. O. S. A. 26, 233 (1936); J. Strong, J. O. S. A. 26, 256 (1936).
[CrossRef]

J. O. S. A. (2)

A. H. Pfund, J. O. S. A. 23, 375 (1933).
[CrossRef]

L. R. Ingersoll, J. G. Winans, and E. H. Krause, J. O. S. A. 26, 233 (1936); J. Strong, J. O. S. A. 26, 256 (1936).
[CrossRef]

Phys. Rev. (3)

R. B. Barnes, R. R. Brattain, and F. Seitz, Phys. Rev. 48, 582 (1935).
[CrossRef]

Filters of this type were first described by Pfund (A. H. Pfund, Phys. Rev. 36, 71 (1930)).
[CrossRef]

R. B. Barnes and L. G. Bonner, Phys. Rev. 49, 732 (1936).
[CrossRef]

Rev. Sci. Inst. (1)

R. B. Barnes, Rev. Sci. Inst. 5, 237 (1934).
[CrossRef]

Science (1)

A. H. Pfund, Science 82, 597 (1935).
[CrossRef] [PubMed]

Zeits. f. Physik (1)

M. Czerny, Zeits. f. Physik 65, 600 (1930).
[CrossRef]

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Figures (12)

Fig. 1
Fig. 1

Emission curve of a Welsbach mantle excited by a gas flame, as obtained on the rocksalt spectrometer.

Fig. 2
Fig. 2

Emission curve of the same mantle shown in Fig. 1, as obtained on the wire grating instrument. The slit width was increased at 6μ in order to bring out more clearly the third-order peaks.

Fig. 3
Fig. 3

Transmission of MgO powder filters prepared by holding the nitrocellulose film at varying distances above the magnesium flame. The distances are (A) 12 inches, (B) 6 inches, (C) 3 inches, and (D) in the flame. The small dips in the curves are due in part to the true absorption of nitrocellulose (compare Fig. 9).

Fig. 4
Fig. 4

Transmission of selenium powder filters on nitrocellulose prepared by distilling selenium at different pressures. The pressures are (A) 0.03 mm, (B) 0.4 mm, (C) 2 mm and (D) 4 mm.

Fig. 5
Fig. 5

The final pure energy spectrum obtained by the use of two selenium powder filters. The large deflections below 3μ are due to the fact that the wide slits used in this experiment included a part of the central image.

Fig. 6
Fig. 6

Prism spectrometer emission spectra of a Welsbach mantle with three different types of excitation. (A) hydrogen flame, (B) gas flame, (C) carbon-depositing gas flame.

Fig. 7
Fig. 7

Transmission curves for several substances mounted on nitrocellulose films. (A) clear nitrocellulose, (B) selenium powder, (C) MgO powder, (D) camphor soot, (E) very thick layer of camphor soot, (F) 1–2μ quartz particles, (G) 50–60μ quartz particles, (H) 100–120μ quartz particles.

Fig. 8
Fig. 8

Transmission of pure paraffin and of several powders melted into the surface of 0.5 mm paraffin plates. (A) 0.5 mm paraffin plate, (B) 2 mm paraffin plate, (C) MgO powder, (D) LiF powder, (E) KCl powder, (F) NaCl powder.

Fig. 9
Fig. 9

Transmission of nitrocellulose. (A) film of ordinary thickness (0.5–1μ), (B) thick film (15μ).

Fig. 10
Fig. 10

Transmission of materials on nitrocellulose films. (A), (B) and (C) three thicknesses of camphor soot, (D) aluminum black.

Fig. 11
Fig. 11

Transmission of paraffin (melting point 68–72°C). (A) 0.6 mm, (B) 1.2 mm, (C) 2.1 mm.

Fig. 12
Fig. 12

Transmission of two Polaroid plates, dotted curve parallel and full curve crossed.