Abstract

The Y v spectrum has been observed in a sliding-spark discharge with the NBS 10.7-m normal-incidence vacuum spectrograph. The analysis has yielded all the levels of the 4<i>p</i><sup>4</sup>5<i>s</i> configuration and nearly all levels of 4<i>p</i><sup>4</sup>4<i>d</i> that can combine with the 4<i>p</i><sup>5 2</sup><i>P</i> ground term. The 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>4<i>d</i> + 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>5<i>s</i>+4<i>s</i>4<i>p</i><sup>6</sup> levels have been theoretically interpreted, including configuration-interaction effects. The 4<i>s</i>4<i>p</i><sup>6</sup><sup>2</sup><i>S</i><sub>½</sub> level was found to have a 26% 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>4<i>d</i>(<sup>1</sup><i>D</i>)<sup>2</sup><i>S</i> character and the 4<i>s</i><sup>2</sup>4<i>p</i><sup>4</sup>4<i>d</i>(<sup>1</sup><i>D</i>)<sup>2</sup><i>S</i><sub>½</sub> level a 22% 4<i>s</i>4<i>p</i><sup>6</sup><sup>2</sup><i>S</i> character. The energy parameters determined from a least-squares fit of the observed level values are compared with Hartree-Fock calculations. The ionization energy is estimated to be 75.0±0.5 eV.

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  1. J. Reader and G. L. Epstein, J. Opt. Soc. Am. 60, 140 (1970).
  2. J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).
  3. J. O. Ekberg, J. E. Hansen, and J. Reader, Zr VI analysis, unpublished.
  4. J. O. Ekberg, J. E. Hansen, and J. Reader, Nb VII analysis, unpublished.
  5. J. O. Ekberg, J. E. Hansen, and J. Reader, MO VIII analysis, unpublished.
  6. C. Froese, Can. 3. Phvs. 41, 1895 (1963).
  7. B. Edlén, in Handbuch der Physik, Vol. XXVII, edited by S. Flügge (Springer, Berlin, 1964), P. 111.

1972 (1)

J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).

1970 (1)

J. Reader and G. L. Epstein, J. Opt. Soc. Am. 60, 140 (1970).

1963 (1)

C. Froese, Can. 3. Phvs. 41, 1895 (1963).

Edlén, B.

B. Edlén, in Handbuch der Physik, Vol. XXVII, edited by S. Flügge (Springer, Berlin, 1964), P. 111.

Ekberg, J. O.

J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).

J. O. Ekberg, J. E. Hansen, and J. Reader, Nb VII analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, MO VIII analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Zr VI analysis, unpublished.

Epstein, G. L.

J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).

J. Reader and G. L. Epstein, J. Opt. Soc. Am. 60, 140 (1970).

Froese, C.

C. Froese, Can. 3. Phvs. 41, 1895 (1963).

Hansen, J. E.

J. O. Ekberg, J. E. Hansen, and J. Reader, MO VIII analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Zr VI analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Nb VII analysis, unpublished.

Reader, J.

J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).

J. Reader and G. L. Epstein, J. Opt. Soc. Am. 60, 140 (1970).

J. O. Ekberg, J. E. Hansen, and J. Reader, Zr VI analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, MO VIII analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Nb VII analysis, unpublished.

Other (7)

J. Reader and G. L. Epstein, J. Opt. Soc. Am. 60, 140 (1970).

J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).

J. O. Ekberg, J. E. Hansen, and J. Reader, Zr VI analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Nb VII analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, MO VIII analysis, unpublished.

C. Froese, Can. 3. Phvs. 41, 1895 (1963).

B. Edlén, in Handbuch der Physik, Vol. XXVII, edited by S. Flügge (Springer, Berlin, 1964), P. 111.

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