Abstract

More than 250 spectrum shifts have been measured for lines of the neutral thorium atom (Th <i>I</i>) and of the singly-ionized thorium atom (Th <i>II</i>) in a sample of thorium containing 13 percent Th 230 (ionium). The observed isotope shifts between Th 230 and Th 232 spectrum lines range in magnitude up to 0.94 cm<sup>-1</sup>. The Th 232 line in every case is to longer wavelength, and hence the Th 230 energy levels are more tightly bound than the corresponding levels of Th 232. A summary is given of isotope shift data.

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  1. See, for example, P. Brix and H. Kopfermann, Anniversary Publication on the Occasion of the 200th Year of the Academy of Science, Göttingen, 1951.
  2. J. E. Rosenthal and G. Breit, Phys. Rev. 41, 459 (1932).
  3. M. F. Crawford and A. L. Schawlow, Phys. Rev. 76, 1310 (1949).
  4. H. Schuler and J. E. Keyston, Z. Physik 70, 1 (1931).
  5. D. A. Jackson, Z. Physik 75, 223 (1932).
  6. H. Schuler and E. G. Jones, Z. Physik 74, 631 (1932).
  7. J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).
  8. Manning, Anderson, and Watson, Phys. Rev. 78, 417 (1950).
  9. B. Jaeckel and H. Kopferman, Z. Physik 99, 492 (1936).
  10. S. Tolansky and E. Lee, Proc. Roy. Soc. (London) A158, 110 (1937).
  11. D. R. Long and D. D. Smith, unpublished material, Oak Ridge, Tennessee.
  12. Burkhart, Stukenbroeker, and Adams, Phys. Rev. 75, 83 (1949).
  13. See, for example, J. J. Katz and E. Rabinowitch, The Chemistry of Uranium (McGraw-Hill Book Company, Inc., New York, 1951).
  14. McNally, Harrison, and Park, J. Opt. Soc. Am. 32, 334 (1942); J. R. McNally, Jr., J. Opt. Soc. Am. 35, 390 (1945).
  15. deBruin, Schuurmans, and Klinkenberg, Z. Physik 121, 667 (1943).
  16. P. F. A. Klinkenberg and R. J. Lang, Physica 15, 774 (1949).
  17. MIT Wavelength Tables (John Wiley and Sons, New York, 1939).
  18. Y. Eisenberg, Physica 18, 177 (1952).

Breit, G.

J. E. Rosenthal and G. Breit, Phys. Rev. 41, 459 (1932).

Brix, P.

See, for example, P. Brix and H. Kopfermann, Anniversary Publication on the Occasion of the 200th Year of the Academy of Science, Göttingen, 1951.

Crawford, M. F.

M. F. Crawford and A. L. Schawlow, Phys. Rev. 76, 1310 (1949).

Eisenberg, Y.

Y. Eisenberg, Physica 18, 177 (1952).

Jackson, D. A.

D. A. Jackson, Z. Physik 75, 223 (1932).

Jaeckel, B.

B. Jaeckel and H. Kopferman, Z. Physik 99, 492 (1936).

Jones, E. G.

H. Schuler and E. G. Jones, Z. Physik 74, 631 (1932).

Katz, J. J.

See, for example, J. J. Katz and E. Rabinowitch, The Chemistry of Uranium (McGraw-Hill Book Company, Inc., New York, 1951).

Keyston, J. E.

H. Schuler and J. E. Keyston, Z. Physik 70, 1 (1931).

Klinkenberg, P. F. A.

P. F. A. Klinkenberg and R. J. Lang, Physica 15, 774 (1949).

Kopferman, H.

B. Jaeckel and H. Kopferman, Z. Physik 99, 492 (1936).

Kopfermann, H.

See, for example, P. Brix and H. Kopfermann, Anniversary Publication on the Occasion of the 200th Year of the Academy of Science, Göttingen, 1951.

Lang, R. J.

P. F. A. Klinkenberg and R. J. Lang, Physica 15, 774 (1949).

Lee, E.

S. Tolansky and E. Lee, Proc. Roy. Soc. (London) A158, 110 (1937).

Long, D. R.

D. R. Long and D. D. Smith, unpublished material, Oak Ridge, Tennessee.

Rabinowitch, E.

See, for example, J. J. Katz and E. Rabinowitch, The Chemistry of Uranium (McGraw-Hill Book Company, Inc., New York, 1951).

Rose, J. L.

J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).

Rosenthal, J. E.

J. E. Rosenthal and G. Breit, Phys. Rev. 41, 459 (1932).

Schawlow, A. L.

M. F. Crawford and A. L. Schawlow, Phys. Rev. 76, 1310 (1949).

Schuler, H.

H. Schuler and J. E. Keyston, Z. Physik 70, 1 (1931).

H. Schuler and E. G. Jones, Z. Physik 74, 631 (1932).

Smith, D. D.

D. R. Long and D. D. Smith, unpublished material, Oak Ridge, Tennessee.

Stranathan, R. K.

J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).

Tolansky, S.

S. Tolansky and E. Lee, Proc. Roy. Soc. (London) A158, 110 (1937).

Other (18)

See, for example, P. Brix and H. Kopfermann, Anniversary Publication on the Occasion of the 200th Year of the Academy of Science, Göttingen, 1951.

J. E. Rosenthal and G. Breit, Phys. Rev. 41, 459 (1932).

M. F. Crawford and A. L. Schawlow, Phys. Rev. 76, 1310 (1949).

H. Schuler and J. E. Keyston, Z. Physik 70, 1 (1931).

D. A. Jackson, Z. Physik 75, 223 (1932).

H. Schuler and E. G. Jones, Z. Physik 74, 631 (1932).

J. L. Rose and R. K. Stranathan, Phys. Rev. 49, 916 (1936).

Manning, Anderson, and Watson, Phys. Rev. 78, 417 (1950).

B. Jaeckel and H. Kopferman, Z. Physik 99, 492 (1936).

S. Tolansky and E. Lee, Proc. Roy. Soc. (London) A158, 110 (1937).

D. R. Long and D. D. Smith, unpublished material, Oak Ridge, Tennessee.

Burkhart, Stukenbroeker, and Adams, Phys. Rev. 75, 83 (1949).

See, for example, J. J. Katz and E. Rabinowitch, The Chemistry of Uranium (McGraw-Hill Book Company, Inc., New York, 1951).

McNally, Harrison, and Park, J. Opt. Soc. Am. 32, 334 (1942); J. R. McNally, Jr., J. Opt. Soc. Am. 35, 390 (1945).

deBruin, Schuurmans, and Klinkenberg, Z. Physik 121, 667 (1943).

P. F. A. Klinkenberg and R. J. Lang, Physica 15, 774 (1949).

MIT Wavelength Tables (John Wiley and Sons, New York, 1939).

Y. Eisenberg, Physica 18, 177 (1952).

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