Abstract

The ionization energies of the neutral rare earths have been derived by means of interpolated values for the energy differences between the 4ƒ<sup>N</sup>6<i>s</i><sup>2</sup>, 4ƒ<sup><i>N</i></sup>6<i>s</i>7<i>s</i>, and 4ƒ<sup><i>N</i></sup>6<i>s</i>8<i>s</i> configurations and the difference in the effective quantum numbers of the 4ƒ<sup><i>N</i></sup>6<i>s</i>7<i>s</i> and 4ƒ<sup><i>N</i></sup>6<i>s</i>8<i>s</i> configurations. In Ce I the 4ƒ5<i>d</i><sup>2</sup><i>ns</i> serieswas used. The results in eV are: The uncertainty is estimated to be ±0.02 eV in all cases but Ce I for which the estimated uncertainty is ±0.06 eV. Values for La I and Gd I obtained spectroscopically by other workers are also tabulated. The present results are compared with those obtained by means of surface ionization. The calculated result for Tb I was inconclusive because of the lack of sufficient knowledge of the energy-level structure.

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  1. J. Sugar and J. Reader, J. Opt. Soc. Am. 55, 1286 (1965).
  2. G. Risberg, Arkiv. Fysik 28, 381 (1965).
  3. I. Bender, S. Penselin, and K. Schlüpman, Z. Physik 179, 4 (1964).
  4. P. F. A. Klinkenberg, Z. Physik 180, 174 (1964).
  5. H. N. Russell, J. Opt. Soc. Am. 40, 550 (1950).
  6. W. C. Martin, J. Opt. Soc. Am. 53, 1047 (1963).
  7. It should be noted that this terminology is a departure from that used in Ref. 1. In that paper these unperturbed centers of gravity were referred to as parent levels in some instances. The 4ƒN parent levels of the 4ƒN6s configurations of the singly ionized atoms are present only in the doubly ionized atom.
  8. B. R. Judd, Phys. Rev. 125, 613 (1962).
  9. J. C. Slater, Quantum Theory of Atomic Structure (McGraw-Hill Book Company, Inc., New York, 1960), Vol. II, pp. 122 ff.
  10. H. N. Russell and C. E. Moore, J. Res. Natl. Bur. Std. 55, 299 (1955).
  11. H. N. Russell and A. S. King, Astrophys. J. 90, 155 (1939).
  12. W. F. Meggers and B. F. Scribner, J. Res. Natl. Bur. Std. 19, 651 (1937).
  13. C. E. Moore, Natl. Bur. Std. (U. S.) Circ. 467, Vol. III (1958).
  14. J. Blaise and R. Vetter, Compt. Rend. 256, 630 (1963).
  15. W. Albertson, Phys. Rev. 52, 644 (1937).
  16. J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).
  17. H. N. Russell and W. F. Meggers, J. Res. Natl. Bur. Std. 9, 625 (1932).
  18. M. Wilson and W. R. S. Garton, private communication (1965).
  19. K. Murakawa, J. Phys. Soc. Japan 20, 1733 (1965).
  20. C. E. Moore, Appl. Opt. 2, 665 (1963). The fact that the ionization energy of Yb I given in this reference is due to Russell was communicated to us by C. E. Moore.
  21. G. Smith and B. G. Wybourne, J. Opt. Soc. Am. 55, 121 (1965).
  22. W. F. Meggers, private communication (1965).
  23. Y. Bordarier, R. Vetter, and J. Blaise, J. Phys. Radium 24, 1107 (1963).

1965 (7)

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

G. Risberg, Arkiv. Fysik 28, 381 (1965).

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

M. Wilson and W. R. S. Garton, private communication (1965).

K. Murakawa, J. Phys. Soc. Japan 20, 1733 (1965).

G. Smith and B. G. Wybourne, J. Opt. Soc. Am. 55, 121 (1965).

W. F. Meggers, private communication (1965).

1964 (2)

I. Bender, S. Penselin, and K. Schlüpman, Z. Physik 179, 4 (1964).

P. F. A. Klinkenberg, Z. Physik 180, 174 (1964).

1963 (4)

W. C. Martin, J. Opt. Soc. Am. 53, 1047 (1963).

Y. Bordarier, R. Vetter, and J. Blaise, J. Phys. Radium 24, 1107 (1963).

C. E. Moore, Appl. Opt. 2, 665 (1963). The fact that the ionization energy of Yb I given in this reference is due to Russell was communicated to us by C. E. Moore.

J. Blaise and R. Vetter, Compt. Rend. 256, 630 (1963).

1962 (1)

B. R. Judd, Phys. Rev. 125, 613 (1962).

1958 (1)

C. E. Moore, Natl. Bur. Std. (U. S.) Circ. 467, Vol. III (1958).

1955 (1)

H. N. Russell and C. E. Moore, J. Res. Natl. Bur. Std. 55, 299 (1955).

1950 (1)

H. N. Russell, J. Opt. Soc. Am. 40, 550 (1950).

1939 (1)

H. N. Russell and A. S. King, Astrophys. J. 90, 155 (1939).

1937 (2)

W. F. Meggers and B. F. Scribner, J. Res. Natl. Bur. Std. 19, 651 (1937).

W. Albertson, Phys. Rev. 52, 644 (1937).

1932 (1)

H. N. Russell and W. F. Meggers, J. Res. Natl. Bur. Std. 9, 625 (1932).

Albertson, W.

W. Albertson, Phys. Rev. 52, 644 (1937).

Bender, I.

I. Bender, S. Penselin, and K. Schlüpman, Z. Physik 179, 4 (1964).

Blaise, J.

J. Blaise and R. Vetter, Compt. Rend. 256, 630 (1963).

Y. Bordarier, R. Vetter, and J. Blaise, J. Phys. Radium 24, 1107 (1963).

Bordarier, Y.

Y. Bordarier, R. Vetter, and J. Blaise, J. Phys. Radium 24, 1107 (1963).

Garton, W. R. S.

M. Wilson and W. R. S. Garton, private communication (1965).

Judd, B. R.

B. R. Judd, Phys. Rev. 125, 613 (1962).

King, A. S.

H. N. Russell and A. S. King, Astrophys. J. 90, 155 (1939).

Klinkenberg, P. F. A.

P. F. A. Klinkenberg, Z. Physik 180, 174 (1964).

Martin, W. C.

W. C. Martin, J. Opt. Soc. Am. 53, 1047 (1963).

Meggers, W. F.

W. F. Meggers, private communication (1965).

W. F. Meggers and B. F. Scribner, J. Res. Natl. Bur. Std. 19, 651 (1937).

H. N. Russell and W. F. Meggers, J. Res. Natl. Bur. Std. 9, 625 (1932).

Moore, C. E.

C. E. Moore, Appl. Opt. 2, 665 (1963). The fact that the ionization energy of Yb I given in this reference is due to Russell was communicated to us by C. E. Moore.

C. E. Moore, Natl. Bur. Std. (U. S.) Circ. 467, Vol. III (1958).

H. N. Russell and C. E. Moore, J. Res. Natl. Bur. Std. 55, 299 (1955).

Murakawa, K.

K. Murakawa, J. Phys. Soc. Japan 20, 1733 (1965).

Penselin, S.

I. Bender, S. Penselin, and K. Schlüpman, Z. Physik 179, 4 (1964).

Reader, J.

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

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

Risberg, G.

G. Risberg, Arkiv. Fysik 28, 381 (1965).

Russell, H. N.

H. N. Russell and C. E. Moore, J. Res. Natl. Bur. Std. 55, 299 (1955).

H. N. Russell, J. Opt. Soc. Am. 40, 550 (1950).

H. N. Russell and A. S. King, Astrophys. J. 90, 155 (1939).

H. N. Russell and W. F. Meggers, J. Res. Natl. Bur. Std. 9, 625 (1932).

Schlüpman, K.

I. Bender, S. Penselin, and K. Schlüpman, Z. Physik 179, 4 (1964).

Scribner, B. F.

W. F. Meggers and B. F. Scribner, J. Res. Natl. Bur. Std. 19, 651 (1937).

Slater, J. C.

J. C. Slater, Quantum Theory of Atomic Structure (McGraw-Hill Book Company, Inc., New York, 1960), Vol. II, pp. 122 ff.

Smith, G.

G. Smith and B. G. Wybourne, J. Opt. Soc. Am. 55, 121 (1965).

Sugar, J.

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

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

Vetter, R.

J. Blaise and R. Vetter, Compt. Rend. 256, 630 (1963).

Y. Bordarier, R. Vetter, and J. Blaise, J. Phys. Radium 24, 1107 (1963).

Wilson, M.

M. Wilson and W. R. S. Garton, private communication (1965).

Wybourne, B. G.

G. Smith and B. G. Wybourne, J. Opt. Soc. Am. 55, 121 (1965).

Other (23)

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

G. Risberg, Arkiv. Fysik 28, 381 (1965).

I. Bender, S. Penselin, and K. Schlüpman, Z. Physik 179, 4 (1964).

P. F. A. Klinkenberg, Z. Physik 180, 174 (1964).

H. N. Russell, J. Opt. Soc. Am. 40, 550 (1950).

W. C. Martin, J. Opt. Soc. Am. 53, 1047 (1963).

It should be noted that this terminology is a departure from that used in Ref. 1. In that paper these unperturbed centers of gravity were referred to as parent levels in some instances. The 4ƒN parent levels of the 4ƒN6s configurations of the singly ionized atoms are present only in the doubly ionized atom.

B. R. Judd, Phys. Rev. 125, 613 (1962).

J. C. Slater, Quantum Theory of Atomic Structure (McGraw-Hill Book Company, Inc., New York, 1960), Vol. II, pp. 122 ff.

H. N. Russell and C. E. Moore, J. Res. Natl. Bur. Std. 55, 299 (1955).

H. N. Russell and A. S. King, Astrophys. J. 90, 155 (1939).

W. F. Meggers and B. F. Scribner, J. Res. Natl. Bur. Std. 19, 651 (1937).

C. E. Moore, Natl. Bur. Std. (U. S.) Circ. 467, Vol. III (1958).

J. Blaise and R. Vetter, Compt. Rend. 256, 630 (1963).

W. Albertson, Phys. Rev. 52, 644 (1937).

J. Reader and J. Sugar, Phys. Rev. 137, B784 (1965).

H. N. Russell and W. F. Meggers, J. Res. Natl. Bur. Std. 9, 625 (1932).

M. Wilson and W. R. S. Garton, private communication (1965).

K. Murakawa, J. Phys. Soc. Japan 20, 1733 (1965).

C. E. Moore, Appl. Opt. 2, 665 (1963). The fact that the ionization energy of Yb I given in this reference is due to Russell was communicated to us by C. E. Moore.

G. Smith and B. G. Wybourne, J. Opt. Soc. Am. 55, 121 (1965).

W. F. Meggers, private communication (1965).

Y. Bordarier, R. Vetter, and J. Blaise, J. Phys. Radium 24, 1107 (1963).

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