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 2<i>s</i><sup>2</sup> 2<i>p</i><sup>2</sup><i>P</i>º-2<i>s</i><sup>2</sup><i>nd</i><sup>2</sup><i>D</i> and 2<i>s</i><sup>2</sup> 2<i>p</i><sup>2</sup><i>P</i>º-2<i>s</i><sup>2</sup><i>ns</i><sup>2</sup><i>S</i> 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 <i>nd</i><sup>2</sup><i>D</i> series yields 66 928.0±0.2 cm<sup>-1</sup>, in agreement with the best previously published value for the ionization potential of boron.

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  1. C. E. Moore, Atomic 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).
  4. B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).
  5. D. Goorvitch and F. P. Valero, Astrophys. J. 171, 643 (1972).
  6. H. E. Clearman, J. Opt. Soc. Am. 42, 373 (1952).
  7. C. M. Brown R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).
  8. United Mineral and Chemical Corp. of New York (99.773% purity).

Brown, C. M.

C. M. Brown R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).

Ginter, M. L.

C. M. Brown R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).

Naber, R. H.

C. M. Brown R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).

Clearman, H. E.

H. E. Clearman, J. Opt. Soc. Am. 42, 373 (1952).

Edlén, B.

B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).

Goorvitch, D.

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

Herzberg, G.

B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).

Johns, J. W. C.

B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).

Litzén, U.

U. Litzén, Phys. Sc. 1, 251 (1970).

Moore, C. E.

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.

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

Ölme, A.

B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).

Tilford, S. G.

C. M. Brown R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).

Valero, F. P.

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

Other (8)

C. E. Moore, Atomic 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.

U. Litzén, Phys. Sc. 1, 251 (1970).

B. Edlén, A. Ölme, G. Herzberg, and J. W. C. Johns, J. Opt. Soc. Am. 60, 889 (1970).

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

H. E. Clearman, J. Opt. Soc. Am. 42, 373 (1952).

C. M. Brown R. H. Naber, S. G. Tilford, and M. L. Ginter, Appl. Opt. 12, 1858 (1973).

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

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