Abstract

Spectra of Bi II and Pb II were excited by high-frequency oscillations in a quartz discharge tube conaining the vapor of the metal in an atmosphere of helium. The following five lines, corresponding to transitions among the five lowest levels of Bi II belonging to the 6<i>s</i><sup>2</sup> 6<i>p</i><sup>2</sup> electron configuration and forbidden by the Laporte selection rule, were observed: λ3240.7 (<sup>1</sup><i>S</i><sub>0</sub>→<sup>3</sup><i>P</i><sub>1</sub>), a pure magnetic dipole line; λ3683.2 (<sup>1</sup><i>S</i><sub>0</sub>→<sup>3</sup>P<sub>2</sub>), a pure electric quadrupole line; two lines of mixed character, λ4850.2 (<sup>1</sup><i>D</i><sub>2</sub> → <sup>3</sup><i>P</i><sub>1</sub>)and λ5913.5 (<sup>1</sup><i>D</i><sub>2</sub>→ <sup>3</sup><i>P</i><sub>2</sub> and λ7503.2 (<sup>3</sup><i>P</i><sub>1</sub> → <sup>3</sup><i>P</i><sub>0</sub>), a pure magnetic dipole line observed for the first time as a nonintercombination transition. In addition, a line was found in the spectrum of Pb II at λ7099.8 (<sup>2</sup><i>P</i><sub>½</sub>0 → <sup>2</sup>P<sub>½</sub>0). It corresponds to the transition between the two lowest levels of Pb II belonging to the 6<i>s</i><sup>2</sup>6<i>p</i> electron configuration. This is a line of mixed character representing the first definite identification of a spin reversal line. By use of Fabry-Perot étalons, the hyperfine structure of each of these lines was photographed, establishing the identity of the lines and, at the same time, giving the hitherto unknown splittings of the corresponding levels. The hyperfine structure splitting factors “<i>A</i>” and the quadrupole coupling constants “<i>B</i>” for the levels were calculated from these results and compared with theory. For this purpose, the procedure for the calculation of quadrupole coupling constants as originally given by Casimir was extended to include the case of two equivalent <i>p</i> electrons.

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  1. S. Mrozowski, Phys. Rev. 58, 1086 (1940).
  2. S. Mrozowski, Phys. Rev. 69, 169 (1946).
  3. See the preceding paper by M. Hults and S. Mrozowski, J. Opt. Soc. Am. 54, 855 (1964).
  4. See the review: S. Mrozowski, Rev. Mod. Phys. 16, 153 (1944).
  5. F. M. Walters, Jr., Sci. Papers Bur. Std. 17, 161 (1922).
  6. S. Tolansky, High Resolution .Speetroscopy (Pitman Publishing Corporation, New York, 1947), Chap. 9.
  7. C. D. Cole and S. Mrozowski, Phys. Rev. 93, 933 (1954).
  8. C. E. Moore, Natl. Bur. Std. (U. S.) Circ. No. 467, Vol. III (1958).
  9. M. F. Crawford and A. B. Mclay, Proc. Roy. Soc. (London) AI43, 540 (1934).
  10. L. T. Earls and R. A. Sawyer, Phys. Rev. 47, 115 (1935).
  11. C. J. Schüler, M. Çiftan, L. C. Bradley III, and H. H. Stroke, J. Opt. Soc. Am. 52, 501 (1962).
  12. H. B. G. Casimir, On the Interaction between Atomic Nuclei and Electrons (Verhandelingen Teyler's Tweede Genootschap, Haarlem, 1936).
  13. G. Breit and L. A. Wills, Phys. Rev. 44, 470 (1933).
  14. S. Goudsmit, Phys. Rev. 43, 636 (1933).
  15. S. Lurio and A. G. Prodell, Phys. Rev. 101, 79 (1956).
  16. Gordon Gould, Phys. Rev. 101, 1828 (1956).
  17. H. Kopfermann, Nuclear Moments, English version prepared from the second German edition by E. E. Schneider (Academic Press Inc., New York, 1958).
  18. H. Schüler and Th. Schmidt, Z. Physik 99, 717 (1936).

Bradley III, L. C.

C. J. Schüler, M. Çiftan, L. C. Bradley III, and H. H. Stroke, J. Opt. Soc. Am. 52, 501 (1962).

Breit, G.

G. Breit and L. A. Wills, Phys. Rev. 44, 470 (1933).

Casimir, H. B. G.

H. B. G. Casimir, On the Interaction between Atomic Nuclei and Electrons (Verhandelingen Teyler's Tweede Genootschap, Haarlem, 1936).

Çiftan, M.

C. J. Schüler, M. Çiftan, L. C. Bradley III, and H. H. Stroke, J. Opt. Soc. Am. 52, 501 (1962).

Cole, C. D.

C. D. Cole and S. Mrozowski, Phys. Rev. 93, 933 (1954).

Crawford, M. F.

M. F. Crawford and A. B. Mclay, Proc. Roy. Soc. (London) AI43, 540 (1934).

Earls, L. T.

L. T. Earls and R. A. Sawyer, Phys. Rev. 47, 115 (1935).

Goudsmit, S.

S. Goudsmit, Phys. Rev. 43, 636 (1933).

Gould, Gordon

Gordon Gould, Phys. Rev. 101, 1828 (1956).

Hults, M.

See the preceding paper by M. Hults and S. Mrozowski, J. Opt. Soc. Am. 54, 855 (1964).

Kopfermann, H.

H. Kopfermann, Nuclear Moments, English version prepared from the second German edition by E. E. Schneider (Academic Press Inc., New York, 1958).

Lurio, S.

S. Lurio and A. G. Prodell, Phys. Rev. 101, 79 (1956).

Mclay, A. B.

M. F. Crawford and A. B. Mclay, Proc. Roy. Soc. (London) AI43, 540 (1934).

Moore, C. E.

C. E. Moore, Natl. Bur. Std. (U. S.) Circ. No. 467, Vol. III (1958).

Mrozowski, S.

See the preceding paper by M. Hults and S. Mrozowski, J. Opt. Soc. Am. 54, 855 (1964).

See the review: S. Mrozowski, Rev. Mod. Phys. 16, 153 (1944).

C. D. Cole and S. Mrozowski, Phys. Rev. 93, 933 (1954).

S. Mrozowski, Phys. Rev. 58, 1086 (1940).

S. Mrozowski, Phys. Rev. 69, 169 (1946).

Prodell, A. G.

S. Lurio and A. G. Prodell, Phys. Rev. 101, 79 (1956).

Sawyer, R. A.

L. T. Earls and R. A. Sawyer, Phys. Rev. 47, 115 (1935).

Schmidt, Th.

H. Schüler and Th. Schmidt, Z. Physik 99, 717 (1936).

Schüler, C. J.

C. J. Schüler, M. Çiftan, L. C. Bradley III, and H. H. Stroke, J. Opt. Soc. Am. 52, 501 (1962).

Schüler, H.

H. Schüler and Th. Schmidt, Z. Physik 99, 717 (1936).

Stroke, H. H.

C. J. Schüler, M. Çiftan, L. C. Bradley III, and H. H. Stroke, J. Opt. Soc. Am. 52, 501 (1962).

Tolansky, S.

S. Tolansky, High Resolution .Speetroscopy (Pitman Publishing Corporation, New York, 1947), Chap. 9.

Walters, Jr., F. M.

F. M. Walters, Jr., Sci. Papers Bur. Std. 17, 161 (1922).

Wills, L. A.

G. Breit and L. A. Wills, Phys. Rev. 44, 470 (1933).

Other (18)

S. Mrozowski, Phys. Rev. 58, 1086 (1940).

S. Mrozowski, Phys. Rev. 69, 169 (1946).

See the preceding paper by M. Hults and S. Mrozowski, J. Opt. Soc. Am. 54, 855 (1964).

See the review: S. Mrozowski, Rev. Mod. Phys. 16, 153 (1944).

F. M. Walters, Jr., Sci. Papers Bur. Std. 17, 161 (1922).

S. Tolansky, High Resolution .Speetroscopy (Pitman Publishing Corporation, New York, 1947), Chap. 9.

C. D. Cole and S. Mrozowski, Phys. Rev. 93, 933 (1954).

C. E. Moore, Natl. Bur. Std. (U. S.) Circ. No. 467, Vol. III (1958).

M. F. Crawford and A. B. Mclay, Proc. Roy. Soc. (London) AI43, 540 (1934).

L. T. Earls and R. A. Sawyer, Phys. Rev. 47, 115 (1935).

C. J. Schüler, M. Çiftan, L. C. Bradley III, and H. H. Stroke, J. Opt. Soc. Am. 52, 501 (1962).

H. B. G. Casimir, On the Interaction between Atomic Nuclei and Electrons (Verhandelingen Teyler's Tweede Genootschap, Haarlem, 1936).

G. Breit and L. A. Wills, Phys. Rev. 44, 470 (1933).

S. Goudsmit, Phys. Rev. 43, 636 (1933).

S. Lurio and A. G. Prodell, Phys. Rev. 101, 79 (1956).

Gordon Gould, Phys. Rev. 101, 1828 (1956).

H. Kopfermann, Nuclear Moments, English version prepared from the second German edition by E. E. Schneider (Academic Press Inc., New York, 1958).

H. Schüler and Th. Schmidt, Z. Physik 99, 717 (1936).

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