Abstract

A method is described for the preparation of electrodeless discharge tubes containing very pure rare earth and heavy element halides. Successful tubes have been prepared using Nd, Pm, Tb, U, Pu, Np, and Am. The effect of changing vapor pressure of the metal in the discharge is discussed and representative spectra shown.

© 1957 Optical Society of America

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References

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  1. W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
    [Crossref]
  2. E. Jacobsen and G. R. Harrison, J. Opt. Soc. Am. 39, 1054 (1949).
  3. Zelikoff, Wyckoff, Aschenbrand, and Loomis, J. Opt. Soc. Am. 42, 818 (1952).
    [Crossref]
  4. Corliss, Bozeman, and Westfall, J. Opt. Soc. Am. 43, 398 (1953).
    [Crossref]
  5. S. Fried and W. H. Zachariasen, International Conference on the Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955 (United Nations, New York, 1956), Paper No. P-730.

1953 (1)

1952 (1)

1950 (1)

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
[Crossref]

1949 (1)

E. Jacobsen and G. R. Harrison, J. Opt. Soc. Am. 39, 1054 (1949).

Aschenbrand,

Bozeman,

Corliss,

Fried, S.

S. Fried and W. H. Zachariasen, International Conference on the Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955 (United Nations, New York, 1956), Paper No. P-730.

Harrison, G. R.

E. Jacobsen and G. R. Harrison, J. Opt. Soc. Am. 39, 1054 (1949).

Jacobsen, E.

E. Jacobsen and G. R. Harrison, J. Opt. Soc. Am. 39, 1054 (1949).

Loomis,

Meggers, W. F.

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
[Crossref]

Westfall,

Westfall, F. O.

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
[Crossref]

Wyckoff,

Zachariasen, W. H.

S. Fried and W. H. Zachariasen, International Conference on the Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955 (United Nations, New York, 1956), Paper No. P-730.

Zelikoff,

J. Opt. Soc. Am. (3)

J. Research Natl. Bur. Standards (1)

W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
[Crossref]

Other (1)

S. Fried and W. H. Zachariasen, International Conference on the Peaceful Uses of Atomic Energy, Geneva, Switzerland, 1955 (United Nations, New York, 1956), Paper No. P-730.

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Figures (8)

Fig. 1
Fig. 1

Reaction tube assembly. (a) Quartz microcentrifuge cone. (b) Reaction tube before drawing capillary. (c) Completed reaction tube with sample.

Fig. 2
Fig. 2

Vacuum line for preparation of electrodeless discharge tubes, and detail of (a) reaction tube and (b) discharge tube.

Fig. 3
Fig. 3

Tube for preparation of aluminum iodide reagent. (a) Reagent tube before drawing capillary. (b) Completed reagent tube.

Fig. 4
Fig. 4

Furnace assembly for operating discharge tube at high temperatures. (A) ceramic furnace element, (C) transite cap, (D) discharge tube, (F) high-frequency director, (Q) quartz liner tube, (S) stainless steel tube, (T) quartz thermocouple well, (W) split conical wedge.

Fig. 5
Fig. 5

Effect of metal vapor pressure on relative intensities of arc and spark lines. The Roman numerals VI and VII refer to the order of the Argonne spectrograph.

Fig. 6
Fig. 6

Self-reversal produced by increased americium vapor pressure.

Fig. 7
Fig. 7

Gain in line sharpness in electrodeless discharge over ac arc. The line is Am ii λ3777 in the VI order of the grating.

Fig. 8
Fig. 8

Exposure of Bi λ3067 (7th order) obtained with electrodeless discharge tube containing 0.1 microgram of Bi210 and 1.0 microgram of Bi209. Separation of Bi209 components ~0.1A.

Equations (1)

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3 MO 2 + 4 AlI 3 3 MI 4 + 2 Al 2 O 3 , 3 MO 2 + 4 AlI 3 3 MI 3 + 2 Al 2 O 3 + 3 / 2 I 2 , M 2 O 3 + 2 AlI 3 2 MI 3 + Al 2 O 3 .