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 4p45s configuration and nearly all levels of 4p44d that can combine with the 4p5 2P ground term. The 4s24p44d + 4s24p45s + 4s4p6 levels have been theoretically interpreted, including configuration-interaction effects. The 4s4p6S212 level was found to have a 26% 4s24p44d(1D)2S character and the 4s24p44d(D1)S212 level a 22% 4s4p6 2S 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.

© 1972 Optical Society of America

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References

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  1. J. Reader and G. L. Epstein, J. Opt. Soc. Am. 60, 140 (1970).
    [CrossRef]
  2. J. Reader, G. L. Epstein, and J. O. Ekberg, J. Opt. Soc. Am. 62, 273 (1972).
    [CrossRef]
  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 J. O. Ekberg, J. E. Hansen, and J. Reader, Zr vi analysis, unpublished.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 J. O. Ekberg, J. E. Hansen, and J. Reader, Nb vii analysis, unpublished.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 J. O. Ekberg, J. E. Hansen, and J. Reader, Mo viii analysis, unpublished.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. J. Phys. 41, 1895 (1963).
    [CrossRef]
  7. B. Edlén, in Handbuch der Physik, Vol. XXVII, edited by S. Flügge (Springer, Berlin, 1964), P. 111.

1972 (1)

1970 (1)

1963 (1)

C. Froese, Can. J. Phys. 41, 1895 (1963).
[CrossRef]

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).
[CrossRef]

J. O. Ekberg, J. E. Hansen, and J. Reader, Mo viii analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Zr vi analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Nb vii analysis, unpublished.

Epstein, G. L.

Froese, C.

C. Froese, Can. J. Phys. 41, 1895 (1963).
[CrossRef]

Hansen, J. E.

J. O. Ekberg, J. E. Hansen, and J. Reader, Nb vii analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Zr vi analysis, unpublished.

J. O. Ekberg, J. E. Hansen, and J. Reader, Mo viii analysis, unpublished.

Reader, J.

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

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

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.

Can. J. Phys. (1)

C. Froese, Can. J. Phys. 41, 1895 (1963).
[CrossRef]

J. Opt. Soc. Am. (2)

Other (4)

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.

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

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Figures (2)

Fig. 1
Fig. 1

Structure of the 4p44d configuration of Y v. Levels are designated in the LS coupling scheme. Predicted positions of levels not observed are shown as thin lines.

Fig. 2
Fig. 2

Structure of the 4p45s configuration of Y v. Levels are designated in the J1j coupling scheme.

Tables (4)

Tables Icon

Table I Classified lines of Y v. Intensities are visual estimates of photographic blackening.

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Table II Energy levels of Y v.

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Table III Calculated energy-level values in cm−1 and percentage compositions for the 4s4p6, 4s24p44d, and 4s24p45s configurations of Y v. The levels of the 4p44d configuration are designated in LS coupling; those belonging to 4p45s are designated in J1j coupling.

Tables Icon

Table IV Electrostatic and spin–orbit parameters for the 4s24p44d, 4s24p45s, and 4s4p6 configurations of Y v. Values are in cm−1.