Dennison, D.; A Note on the Specific Heat of the Hydrogen Molecule
Proc. Roy. Soc. A115 (1927) 483;
" In conclusion we may say that by assuming that the symmetrical and antisymmetrical rotational states of the hydrogen molecule do not combine during a time long compared with the time of the experiment, we obtain a specific heat curve which follows the observed curve to within the errors of observation, and that moreover the conctants and I are in good agreement with the values of these constants as found in the band spectrum of the H2 noindent [ Added June 16, 1927. - It may be pointed out that the ratio of 3 to 1 of the antisymmetrical and symmetrical modifications of hydrogen, as regards the rotation of the molecule, is just what is to be expected from a consideration of the equilibrium at ordinary temperatures if the nuclear spin is taken equal to that of electron, and only the complete antisymmetrical solution of the Schrödinger wave equation allowedfootnoteW. Heisenberg, Z.f.Physik, vol.41, p.239 (1927),
in particular see p.264.. ...]. Extracted from the end part of the paper from page 266..
Related references See also W. Heisenberg, Annalen der Physik. Leipzig 41 (1927) 239;
Analyse data from A. Eucken, Preuss. Akad. d. Wiss., p.141 (1912);
J.R. Partington and A.B. Howe, Proc. Roy. Soc. A109 (1925) 286;
F.A. Giacomini, Phil. Mag. 50 (1925) 146;
J.H. Brinkworth, Proc. Roy. Soc. A107 (1925) 510;
F. Hund, Z. Phys. 42 (1927) 93;
K. Scheel and H.Heuse, Annalen der Physik. Leipzig 40 (1913) 473;
Evidence that proton spin is equal to the electron spin.