Relativistic corrections of m\alpha^6(m/M) order to the hyperfine   structure of the H_2^+ molecular ion
  The m\alpha^6(m/M) order corrections to the hyperfine splitting in the H_2^+ ion are calculated. That allows to reduce uncertainty in the frequency intervals between hyperfine sublevels of a given rovibrational state to about 10 ppm. Results are in good agreement with the high precision experiment carried out by Jefferts in 1969. 
V.I. Korobov, L. Hilico, and J.-Ph. Karr