Nuclear Spins of the Carbon Isotopes

F. A. Jenkins

doi:10.1103/PhysRev.74.355

Access by Xinjiang University

Nuclear Spins of the Carbon Isotopes

F. A. Jenkins

Department of Physics, University of California, Berkeley, California

PDF

Phys. Rev. 74, 355 – Published 15 August, 1948

DOI: https://doi.org/10.1103/PhysRev.74.355

Abstract

High dispersion spectrograms of the Swan bands of diatomic carbon are obtained from samples enriched to 50 percent and 40 percent, respectively, in $C^{13}$ and $C^{14}$ . The method of exciting an intense spectrum with microgram samples is described. To permit measurements of the alternating-intensity ratio, current densities in the source had to be limited so that the $Λ$ -type doublets were well resolved. For $C^{13}$ , photometric measurements of this ratio give 3:1, showing that the nuclear spin $I = \frac{1}{2}$ . The antisymmetric rotational levels have the higher statistical weight (Fermi-Dirac statistics). For $C^{14}$ , only the lines from symmetric levels appear. This shows clearly that $I = 0$ for $C^{14}$ , and that the nucleus obeys Einstein-Bose statistics. Wave numbers are given of lines in the $R$ branches of the 0,0 band in the range $K = 12 to 20$ , due to all molecular species containing $C^{12}$ , $C^{13}$ and $C^{14}$ . An isotope effect in the splittings of the electronic triplets is investigated, and found to agree with that calculated from the general term formula for ${}^{3}Π$ states.

References (15)

C. H. Townes and W. R. Smythe, Phys. Rev. 56, 1210 (1939)
F. A. Jenkins, Phys. Rev. 72, 169(A) (1947)
F. A. Jenkins, Phys. Rev. 73, 639 (1948)
R. C. Johnson, Phil. Trans. Roy. Soc. London A226, 157 (1926)
D. E. Wooldridge and F. A. Jenkins, Phys. Rev. 49, 404 (1936)
A. R. Brosi and W. D. Harkins, Phys. Rev. 52, 472 (1937)
L. D. Norris and A. H. Snell, Phys. Rev. 73, 254 (1948)
L. D. Norris and M. G. Inghram, Phys. Rev. 73, 350 (1948)
Ornstein, Moll, and Burger, Objektive Spektralphotometrie (Vieweg, Braunschweig, Germany, 1932), pp. 46, 89
J. D. Shea, Phys. Rev. 30, 825 (1927)
R. S. Milliken, Rev. Mod. Phys. 2, 146 (1930)
A. S. King and R. T. Birge, Astrophys. J. 72, 38 (1930)
L. D. Norris, Bull. Am. Phys. Soc. 23, 46 (1948)
A. Budó, Zeits. f. Physik 98, 437 (1935)
A. Roberts, Phys. Rev. 73, 1405 (1948)

[c1] C. H. Townes and W. R. Smythe, Phys. Rev. 56, 1210 (1939)

[c2] F. A. Jenkins, Phys. Rev. 72, 169(A) (1947)

[c3] F. A. Jenkins, Phys. Rev. 73, 639 (1948)

[c4] R. C. Johnson, Phil. Trans. Roy. Soc. London A226, 157 (1926)

[c5] D. E. Wooldridge and F. A. Jenkins, Phys. Rev. 49, 404 (1936)

[c6] A. R. Brosi and W. D. Harkins, Phys. Rev. 52, 472 (1937)

[c7] L. D. Norris and A. H. Snell, Phys. Rev. 73, 254 (1948)

[c8] L. D. Norris and M. G. Inghram, Phys. Rev. 73, 350 (1948)

[c9] Ornstein, Moll, and Burger, Objektive Spektralphotometrie (Vieweg, Braunschweig, Germany, 1932), pp. 46, 89

[c10] J. D. Shea, Phys. Rev. 30, 825 (1927)

[c11] R. S. Milliken, Rev. Mod. Phys. 2, 146 (1930)

[c12] A. S. King and R. T. Birge, Astrophys. J. 72, 38 (1930)

[c13] L. D. Norris, Bull. Am. Phys. Soc. 23, 46 (1948)

[c14] A. Budó, Zeits. f. Physik 98, 437 (1935)

[c15] A. Roberts, Phys. Rev. 73, 1405 (1948)

Physical Review Journals Archive

Export citation

Export citation

Nuclear Spins of the Carbon Isotopes

Abstract

References (15)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation