Abstract

Accurate wavelengths and wavenumbers of over 22 000 dysprosium lines have been measured in the wavelength region 2300-11 400 Å. The Zeeman effect has been observed at a field strength of 24000 G from 2300 to 9000 Å. By comparison of relative intensities of the lines from sources under various conditions, 85% of the lines have been assigned as Dy I or Dy II spectrum lines. From the energy-level analysis, 141 even and 197 odd levels of Dy I are known. Combinations between these levels account for 1952 lines. For Dy II, 14 even and 214 odd levels are known, with 1000 lines classified. The ground levels of Dy I and Dy II are 4ƒ<sup>10</sup>6<i>s</i><sup>2</sup><sup>5</sup><i>I</i><sub>8</sub> and 4ƒ<sup>10</sup>6<i>s</i><sup>6</sup><i>I</i><sub>8</sub><sub>½</sub>, respectively. The lowest level of the 4ƒ<sup>9</sup>5<i>d</i>6<i>s</i><sup>2</sup> configuration of Dy I lies 7565.62 cm<sup>-1</sup> above the ground level. The <i>g</i> values for most of the levels of both spectra are given.

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  1. E. Paulson, Astrophys. J. 40, 298 (1914).
  2. W. F. Meggers, Rev. Mod. Phys. 14, 96 (1942).
  3. Transactions of the Triple Commission for Spectroscopy, J. Opt. Soc. Am. 52, 478 (1962).
  4. K. F. Smith and I. J. Spalding, Proc. Roy. Soc. (London) A265, 133 (1961); A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).
  5. J. M. Blank, thesis, Massachusetts Institute of Technology, June, 1952.
  6. A. S. King, Astrophys. J. 72, 221 (1930).
  7. A. S. King and C. E. Moore, Astrophys. J. 98, 33 (1943).
  8. A. S. King, J. G. Conway, E. F. Worden, and C. E. Moore, J. Res. Natl. Bur. Std. (U. S.) 74A, 355 (1970).
  9. W. F. Meggers, C. H. Corliss, and B. H. Scribner, Tables of Spectral-Line Intensities (U. S. Govt. Printing Office, Washington, D. C., 1961), and references cited therein.
  10. F. S. Tomkins and M. Fred, J. Opt. Soc. Am. 47, 1087 (1957).
  11. E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).
  12. F. S. Tomkins and M. Fred, Spectrochim. Acta 6, 139 (1954).
  13. F. S. Tomkins and M. Fred, Appl. Opt. 2, 715 (1963).
  14. S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, 1963).
  15. M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 41, 641 (1951).
  16. W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61A, 95 (1958).
  17. A. Giacchetti, J. Opt. Soc. Am. 56, 653 (1966).
  18. A. Giacchetti, J. Opt. Soc. Am. 57, 728 (1967).
  19. J. Reader and S. P. Davis, J. Res. Nat]. Bur. Std. (U. S.) 71A, 587 (1967).
  20. M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 47, 1076 (1957).
  21. We are indebted to M. Fred of Argonne National Laboratory for the computer program for least-squares reduction of the Zeeman data.
  22. K. L. Vander Sluis, J. Opt. Soc. Am. 46, 605 (1956).
  23. J. G. Conway and B. G. Wybourne, Phys. Rev. 130, 2325 (1963).
  24. Our search programs were obtained from the National Bureau of Standards. They were originally written by G. Racah for the analysis of complex spectra.
  25. R. J. Mehlhorn, thesis, University of California, UCRL-18040, 1968.
  26. C. W. Nielson and G. F. Koster, Spectroscopic Coefficients for the pn, dn, and ƒn, Configurations (M. I. T. Press, Cambridge, Mass., 1963).
  27. B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).
  28. C. Arnoult and S. Gerstenkorn, J. Opt. Soc. Am. 56, 177 (1966).
  29. J. Sugar and J. Reader, J. Opt. Soc. Am. 55, 1286 (1965).
  30. B. G. Wybourne, Spectroscopic Properties of Rare Earths (Wiley, New York, 1965), p. 56.
  31. Z. B. Goldschmidt, in Spectroscopic and Group Theoretical Methods in Physics, edited by F. Block, S. G. Cohen, A. De-Shalit, S. Sambursky, and I. Talmi (North-Holland, Amsterdam, 1968; American Elsevier, New York, distr.).
  32. K. L. Vander Sluis and J. R. McNally, Jr., J. Opt. Soc. Am. 60, 1209 (1970).
  33. Tables of the classified levels of Dy I and II are available from the National Technical Information Service (NTIS), Springfield, Va. 22151. The report is identified as UCRL-19944.

Arnoult, C.

C. Arnoult and S. Gerstenkorn, J. Opt. Soc. Am. 56, 177 (1966).

Blank, J. M.

J. M. Blank, thesis, Massachusetts Institute of Technology, June, 1952.

Conway, J. G.

A. S. King, J. G. Conway, E. F. Worden, and C. E. Moore, J. Res. Natl. Bur. Std. (U. S.) 74A, 355 (1970).

J. G. Conway and B. G. Wybourne, Phys. Rev. 130, 2325 (1963).

E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).

Corliss, C. H.

W. F. Meggers, C. H. Corliss, and B. H. Scribner, Tables of Spectral-Line Intensities (U. S. Govt. Printing Office, Washington, D. C., 1961), and references cited therein.

Davis, S. P.

S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, 1963).

J. Reader and S. P. Davis, J. Res. Nat]. Bur. Std. (U. S.) 71A, 587 (1967).

Fred, M.

F. S. Tomkins and M. Fred, Spectrochim. Acta 6, 139 (1954).

M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 41, 641 (1951).

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

M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 47, 1076 (1957).

F. S. Tomkins and M. Fred, Appl. Opt. 2, 715 (1963).

Gerstenkorn, S.

C. Arnoult and S. Gerstenkorn, J. Opt. Soc. Am. 56, 177 (1966).

Giacchetti, A.

A. Giacchetti, J. Opt. Soc. Am. 56, 653 (1966).

A. Giacchetti, J. Opt. Soc. Am. 57, 728 (1967).

Goldschmidt, Z. B.

Z. B. Goldschmidt, in Spectroscopic and Group Theoretical Methods in Physics, edited by F. Block, S. G. Cohen, A. De-Shalit, S. Sambursky, and I. Talmi (North-Holland, Amsterdam, 1968; American Elsevier, New York, distr.).

Gutmacher, R. G.

E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).

Judd, B. R.

B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).

King, A. S.

A. S. King, Astrophys. J. 72, 221 (1930).

A. S. King, J. G. Conway, E. F. Worden, and C. E. Moore, J. Res. Natl. Bur. Std. (U. S.) 74A, 355 (1970).

A. S. King and C. E. Moore, Astrophys. J. 98, 33 (1943).

Koster, G. F.

C. W. Nielson and G. F. Koster, Spectroscopic Coefficients for the pn, dn, and ƒn, Configurations (M. I. T. Press, Cambridge, Mass., 1963).

Lindgren, I.

B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).

McNally, Jr., J. R.

K. L. Vander Sluis and J. R. McNally, Jr., J. Opt. Soc. Am. 60, 1209 (1970).

Meggers, W. F.

W. F. Meggers, C. H. Corliss, and B. H. Scribner, Tables of Spectral-Line Intensities (U. S. Govt. Printing Office, Washington, D. C., 1961), and references cited therein.

W. F. Meggers, Rev. Mod. Phys. 14, 96 (1942).

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61A, 95 (1958).

Mehlhorn, R. J.

R. J. Mehlhorn, thesis, University of California, UCRL-18040, 1968.

Moore, C. E.

A. S. King, J. G. Conway, E. F. Worden, and C. E. Moore, J. Res. Natl. Bur. Std. (U. S.) 74A, 355 (1970).

A. S. King and C. E. Moore, Astrophys. J. 98, 33 (1943).

Nielson, C. W.

C. W. Nielson and G. F. Koster, Spectroscopic Coefficients for the pn, dn, and ƒn, Configurations (M. I. T. Press, Cambridge, Mass., 1963).

Paulson, E.

E. Paulson, Astrophys. J. 40, 298 (1914).

Phillips, J. G.

S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, 1963).

Racah, G.

Our search programs were obtained from the National Bureau of Standards. They were originally written by G. Racah for the analysis of complex spectra.

Reader, J.

J. Reader and S. P. Davis, J. Res. Nat]. Bur. Std. (U. S.) 71A, 587 (1967).

J. Sugar and J. Reader, J. Opt. Soc. Am. 55, 1286 (1965).

Scribner, B. H.

W. F. Meggers, C. H. Corliss, and B. H. Scribner, Tables of Spectral-Line Intensities (U. S. Govt. Printing Office, Washington, D. C., 1961), and references cited therein.

Sluis, K. L. Vander

K. L. Vander Sluis and J. R. McNally, Jr., J. Opt. Soc. Am. 60, 1209 (1970).

Smith, K. F.

K. F. Smith and I. J. Spalding, Proc. Roy. Soc. (London) A265, 133 (1961); A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).

Spalding, I. J.

K. F. Smith and I. J. Spalding, Proc. Roy. Soc. (London) A265, 133 (1961); A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).

Stanley, R. W.

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61A, 95 (1958).

Sugar, J.

J. Sugar and J. Reader, J. Opt. Soc. Am. 55, 1286 (1965).

Tomkins, F. S.

M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 41, 641 (1951).

F. S. Tomkins and M. Fred, Spectrochim. Acta 6, 139 (1954).

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

M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 47, 1076 (1957).

F. S. Tomkins and M. Fred, Appl. Opt. 2, 715 (1963).

Vander Sluis, K. L.

K. L. Vander Sluis, J. Opt. Soc. Am. 46, 605 (1956).

Worden, E. F.

E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).

A. S. King, J. G. Conway, E. F. Worden, and C. E. Moore, J. Res. Natl. Bur. Std. (U. S.) 74A, 355 (1970).

Wybourne, B. G.

J. G. Conway and B. G. Wybourne, Phys. Rev. 130, 2325 (1963).

B. G. Wybourne, Spectroscopic Properties of Rare Earths (Wiley, New York, 1965), p. 56.

Other (33)

E. Paulson, Astrophys. J. 40, 298 (1914).

W. F. Meggers, Rev. Mod. Phys. 14, 96 (1942).

Transactions of the Triple Commission for Spectroscopy, J. Opt. Soc. Am. 52, 478 (1962).

K. F. Smith and I. J. Spalding, Proc. Roy. Soc. (London) A265, 133 (1961); A. Y. Cabezas, I. Lindgren, and R. Marrus, Phys. Rev. 122, 1796 (1961).

J. M. Blank, thesis, Massachusetts Institute of Technology, June, 1952.

A. S. King, Astrophys. J. 72, 221 (1930).

A. S. King and C. E. Moore, Astrophys. J. 98, 33 (1943).

A. S. King, J. G. Conway, E. F. Worden, and C. E. Moore, J. Res. Natl. Bur. Std. (U. S.) 74A, 355 (1970).

W. F. Meggers, C. H. Corliss, and B. H. Scribner, Tables of Spectral-Line Intensities (U. S. Govt. Printing Office, Washington, D. C., 1961), and references cited therein.

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

E. F. Worden, R. G. Gutmacher, and J. G. Conway, Appl. Opt. 2, 707 (1963).

F. S. Tomkins and M. Fred, Spectrochim. Acta 6, 139 (1954).

F. S. Tomkins and M. Fred, Appl. Opt. 2, 715 (1963).

S. P. Davis and J. G. Phillips, The Red System of the CN Molecule (University of California Press, Berkeley, 1963).

M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 41, 641 (1951).

W. F. Meggers and R. W. Stanley, J. Res. Natl. Bur. Std. (U. S.) 61A, 95 (1958).

A. Giacchetti, J. Opt. Soc. Am. 56, 653 (1966).

A. Giacchetti, J. Opt. Soc. Am. 57, 728 (1967).

J. Reader and S. P. Davis, J. Res. Nat]. Bur. Std. (U. S.) 71A, 587 (1967).

M. Fred and F. S. Tomkins, J. Opt. Soc. Am. 47, 1076 (1957).

We are indebted to M. Fred of Argonne National Laboratory for the computer program for least-squares reduction of the Zeeman data.

K. L. Vander Sluis, J. Opt. Soc. Am. 46, 605 (1956).

J. G. Conway and B. G. Wybourne, Phys. Rev. 130, 2325 (1963).

Our search programs were obtained from the National Bureau of Standards. They were originally written by G. Racah for the analysis of complex spectra.

R. J. Mehlhorn, thesis, University of California, UCRL-18040, 1968.

C. W. Nielson and G. F. Koster, Spectroscopic Coefficients for the pn, dn, and ƒn, Configurations (M. I. T. Press, Cambridge, Mass., 1963).

B. R. Judd and I. Lindgren, Phys. Rev. 122, 1802 (1961).

C. Arnoult and S. Gerstenkorn, J. Opt. Soc. Am. 56, 177 (1966).

J. Sugar and J. Reader, J. Opt. Soc. Am. 55, 1286 (1965).

B. G. Wybourne, Spectroscopic Properties of Rare Earths (Wiley, New York, 1965), p. 56.

Z. B. Goldschmidt, in Spectroscopic and Group Theoretical Methods in Physics, edited by F. Block, S. G. Cohen, A. De-Shalit, S. Sambursky, and I. Talmi (North-Holland, Amsterdam, 1968; American Elsevier, New York, distr.).

K. L. Vander Sluis and J. R. McNally, Jr., J. Opt. Soc. Am. 60, 1209 (1970).

Tables of the classified levels of Dy I and II are available from the National Technical Information Service (NTIS), Springfield, Va. 22151. The report is identified as UCRL-19944.

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