Abstract

The absorption spectrum of B i in the 1350–1900-Å region has been photographed in the third and fourth orders of a 6.6-m spectrograph. The 2s2 2p 2P°–2s2 nd 2D and 2s2 2p 2P°–2s2 ns 2S series were observed to n = 39 and n = 10, respectively, leading to the assignment of 35 new term levels in B i. Extrapolation of the nd 2D series yields 66 928.0±0.2 cm−1, in agreement with the best previously published value for the ionization potential of boron.

© 1974 Optical Society of America

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References

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  1. C. E. Moore, Atomnic Energy Levels, I, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949), p. 16.
  2. C. E. Moore, Bibliography on the Analyses of Optical Atomic Spectra, Natl. Bur. Stand. (U. S.) Spec. Publ. No. 306 (U. S. Government Printing office, Washington, D. C., 1968), Sec. 1, p. 8.
  3. U. Litzén, Phys. Sc. 1, 251 (1970).
    [CrossRef]
  4. B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).
    [CrossRef]
  5. D. Goorvitch and F. P. Valero, Astrophys. J. 171, 643 (1972).
    [CrossRef]
  6. H. E. Clearman, J. Opt. Soc. Am. 42, 373 (1952).
    [CrossRef]
  7. C. M. Brown, R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).
    [CrossRef] [PubMed]
  8. United Mineral and Chemical Corp. of New York (99.773% purity).

1973 (1)

1972 (1)

D. Goorvitch and F. P. Valero, Astrophys. J. 171, 643 (1972).
[CrossRef]

1970 (2)

1952 (1)

Brown, C. M.

Clearman, H. E.

Edlén, B.

Ginter, M. L.

Goorvitch, D.

D. Goorvitch and F. P. Valero, Astrophys. J. 171, 643 (1972).
[CrossRef]

Herzberg, G.

Johns, J. W. C.

Litzén, U.

U. Litzén, Phys. Sc. 1, 251 (1970).
[CrossRef]

Moore, C. E.

C. E. Moore, Atomnic Energy Levels, I, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949), p. 16.

C. E. Moore, Bibliography on the Analyses of Optical Atomic Spectra, Natl. Bur. Stand. (U. S.) Spec. Publ. No. 306 (U. S. Government Printing office, Washington, D. C., 1968), Sec. 1, p. 8.

Naber, R. H.

Ölme, A.

Tilford, S. G.

Valero, F. P.

D. Goorvitch and F. P. Valero, Astrophys. J. 171, 643 (1972).
[CrossRef]

Appl. Opt. (1)

Astrophys. J. (1)

D. Goorvitch and F. P. Valero, Astrophys. J. 171, 643 (1972).
[CrossRef]

J. Opt. Soc. Am. (2)

Phys. Sc. (1)

U. Litzén, Phys. Sc. 1, 251 (1970).
[CrossRef]

Other (3)

United Mineral and Chemical Corp. of New York (99.773% purity).

C. E. Moore, Atomnic Energy Levels, I, Natl. Bur. Stand. (U.S.) Circ. No. 467 (U. S. Government Printing Office, Washington, D. C., 1949), p. 16.

C. E. Moore, Bibliography on the Analyses of Optical Atomic Spectra, Natl. Bur. Stand. (U. S.) Spec. Publ. No. 306 (U. S. Government Printing office, Washington, D. C., 1968), Sec. 1, p. 8.

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Figures (4)

Fig. 1
Fig. 1

The 2s2 2p 2P°–2s2 5d 2D and 2s2 2p 2P°–2s2 6s 2S transitions in B i. Although not obvious in the figure, the 2P°–2D transitions are slightly more intense than the 2P°–2S transitions.

Fig. 2
Fig. 2

Plot of term defect vs energy level for the 2s2 ns 2S series of B i. The dashed line indicates the position of the perturbing 2s 2p2 2S energy level.

Fig. 3
Fig. 3

The 2s2 2p 2P°–2s 2p2 2P transitions of B i. These boron lines were photographed in the fourth order. Other absorption lines present in the spectrogram are Si i and Fe i lines in the third order of the grating.

Fig. 4
Fig. 4

Term-defect plot for the 2s2 nd 2D energy levels of B i for two different values of the series limit, ●ν = 66 928.0 cm−1; josa-64-6-877-i002ν = 66 928.1 cm−1.

Tables (1)

Tables Icon

Table I Observed B I absorption lines.