Abstract

Interferometric wavelengths, suitable for use as secondary standards of class “<i>B</i>”, are given for 68 thorium lines in the range 2650 to 3400 A, as emitted by a thorium-iodide electrodeless discharge tube without carrier gas. The rms deviation from the mean is 3 × 10<sup>-4</sup> A. The method of preparation of a reliable and very intense thorium electrodeless tube is described.

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  1. B. Edlén, Trans. Intern. Astron. Union 10, 211 (1960).
  2. W. F. Meggers and R. W. Stanley, J. Research Natl. Bur. Standards 61, 95 (1958).
  3. R. W. Stanley and W. F. Meggers, J. Research Natl. Bur. Standards 58, 41 (1957).
  4. H. M. Crosswhite, Johns Hopkins Spectroscopic Rept. No. 13 (1958).
  5. W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).
  6. M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).
  7. C. H. Corliss, W. R. Bozman, and F. O. Westfall, J. Opt. Soc. Am. 43, 398 (1953).
  8. F. S. Tomkins and M. Fred, J. Opt. Soc. Am. 47, 1087 (1957).
  9. J. Reader (private communication, June 24, 1959).
  10. W. F. Meggers and F. O. Westfall, J. Research Natl. Bur. Standards 44, 447 (1950).
  11. K. M. Baird and D. S. Smith, Can. J. Phys. 35, 455 (1957).
  12. S. Tolansky, High Resolution Spectroscopy (Methuen and Company, Ltd., London, 1947).
  13. K. W. Meissner, J. Opt. Soc. Am. 31, 405 (1941).
  14. See, for example, C. V. Jackson, Proc. Roy. Soc. (London) A130, 395 (1930).
  15. D. Steinhaus, J. Opt. Soc. Am. 50, 672 (1960).
  16. V. K. Kaufman (private communication, July 12, 1961).
  17. R. Zalubus, Natl. Bur. Standards Monograph 17, June 21 (1960).
  18. B. Edĺn, J. Opt. Soc. Am. 43, 339 (1953).
  19. T. A. Littlefield and W. A. Wood, Draft Report, Commission 14 of the I.A.U. (To be published in Trans. I.A.U. 1962.)

1962

T. A. Littlefield and W. A. Wood, Draft Report, Commission 14 of the I.A.U. (To be published in Trans. I.A.U. 1962.)

1960

D. Steinhaus, J. Opt. Soc. Am. 50, 672 (1960).

R. Zalubus, Natl. Bur. Standards Monograph 17, June 21 (1960).

B. Edlén, Trans. Intern. Astron. Union 10, 211 (1960).

1958

W. F. Meggers and R. W. Stanley, J. Research Natl. Bur. Standards 61, 95 (1958).

H. M. Crosswhite, Johns Hopkins Spectroscopic Rept. No. 13 (1958).

1957

R. W. Stanley and W. F. Meggers, J. Research Natl. Bur. Standards 58, 41 (1957).

F. S. Tomkins and M. Fred, J. Opt. Soc. Am. 47, 1087 (1957).

K. M. Baird and D. S. Smith, Can. J. Phys. 35, 455 (1957).

1955

W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).

1953

B. Edĺn, J. Opt. Soc. Am. 43, 339 (1953).

C. H. Corliss, W. R. Bozman, and F. O. Westfall, J. Opt. Soc. Am. 43, 398 (1953).

1952

M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).

1950

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

1941

K. W. Meissner, J. Opt. Soc. Am. 31, 405 (1941).

1930

See, for example, C. V. Jackson, Proc. Roy. Soc. (London) A130, 395 (1930).

Aschenbrand, L. M.

M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).

Baird, K. M.

K. M. Baird and D. S. Smith, Can. J. Phys. 35, 455 (1957).

Bozman, W. R.

C. H. Corliss, W. R. Bozman, and F. O. Westfall, J. Opt. Soc. Am. 43, 398 (1953).

Corliss, C. H.

C. H. Corliss, W. R. Bozman, and F. O. Westfall, J. Opt. Soc. Am. 43, 398 (1953).

Crosswhite, H. M.

H. M. Crosswhite, Johns Hopkins Spectroscopic Rept. No. 13 (1958).

Edlén, B.

B. Edlén, Trans. Intern. Astron. Union 10, 211 (1960).

Edln, B.

B. Edĺn, J. Opt. Soc. Am. 43, 339 (1953).

Fred, M.

F. S. Tomkins and M. Fred, J. Opt. Soc. Am. 47, 1087 (1957).

Jackson, C. V.

See, for example, C. V. Jackson, Proc. Roy. Soc. (London) A130, 395 (1930).

Kaufman, V. K.

V. K. Kaufman (private communication, July 12, 1961).

Littlefield, T. A.

T. A. Littlefield and W. A. Wood, Draft Report, Commission 14 of the I.A.U. (To be published in Trans. I.A.U. 1962.)

Loomis, R. S.

M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).

Meggers, W. F.

W. F. Meggers and R. W. Stanley, J. Research Natl. Bur. Standards 61, 95 (1958).

R. W. Stanley and W. F. Meggers, J. Research Natl. Bur. Standards 58, 41 (1957).

W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).

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

Meissner, K. W.

K. W. Meissner, J. Opt. Soc. Am. 31, 405 (1941).

Reader, J.

J. Reader (private communication, June 24, 1959).

Smith, D. S.

K. M. Baird and D. S. Smith, Can. J. Phys. 35, 455 (1957).

Stanley, R. W.

W. F. Meggers and R. W. Stanley, J. Research Natl. Bur. Standards 61, 95 (1958).

R. W. Stanley and W. F. Meggers, J. Research Natl. Bur. Standards 58, 41 (1957).

Steinhaus, D.

D. Steinhaus, J. Opt. Soc. Am. 50, 672 (1960).

Tolansky, S.

S. Tolansky, High Resolution Spectroscopy (Methuen and Company, Ltd., London, 1947).

Tomkins, F. S.

F. S. Tomkins and M. Fred, J. Opt. Soc. Am. 47, 1087 (1957).

Westfall, F. O.

C. H. Corliss, W. R. Bozman, and F. O. Westfall, J. Opt. Soc. Am. 43, 398 (1953).

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

Wood, W. A.

T. A. Littlefield and W. A. Wood, Draft Report, Commission 14 of the I.A.U. (To be published in Trans. I.A.U. 1962.)

Wyckoff, P. H.

M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).

Zalubus, R.

R. Zalubus, Natl. Bur. Standards Monograph 17, June 21 (1960).

Zelikoff, M.

M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).

Other

B. Edlén, Trans. Intern. Astron. Union 10, 211 (1960).

W. F. Meggers and R. W. Stanley, J. Research Natl. Bur. Standards 61, 95 (1958).

R. W. Stanley and W. F. Meggers, J. Research Natl. Bur. Standards 58, 41 (1957).

H. M. Crosswhite, Johns Hopkins Spectroscopic Rept. No. 13 (1958).

W. F. Meggers, Trans. Intern. Astron. Union 9, 225 (1955).

M. Zelikoff, P. H. Wyckoff, L. M. Aschenbrand, and R. S. Loomis, J. Opt. Soc. Am. 42, 818 (1952).

C. H. Corliss, W. R. Bozman, and F. O. Westfall, J. Opt. Soc. Am. 43, 398 (1953).

F. S. Tomkins and M. Fred, J. Opt. Soc. Am. 47, 1087 (1957).

J. Reader (private communication, June 24, 1959).

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

K. M. Baird and D. S. Smith, Can. J. Phys. 35, 455 (1957).

S. Tolansky, High Resolution Spectroscopy (Methuen and Company, Ltd., London, 1947).

K. W. Meissner, J. Opt. Soc. Am. 31, 405 (1941).

See, for example, C. V. Jackson, Proc. Roy. Soc. (London) A130, 395 (1930).

D. Steinhaus, J. Opt. Soc. Am. 50, 672 (1960).

V. K. Kaufman (private communication, July 12, 1961).

R. Zalubus, Natl. Bur. Standards Monograph 17, June 21 (1960).

B. Edĺn, J. Opt. Soc. Am. 43, 339 (1953).

T. A. Littlefield and W. A. Wood, Draft Report, Commission 14 of the I.A.U. (To be published in Trans. I.A.U. 1962.)

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