Rotational g factors calculated for diatomic molecular cations H2+, HeH+ and NeH+

Abstract

For three diatomic molecular cations—H2+, HeH+ and NeH+ and their isotopic variants, we calculated the rotational g factor, gr, as a function of internuclear separation R with attention to characteristics at distances much smaller or larger than equilibrium separation Re and with the correct nuclear contribution in terms of nuclear masses. We derive a general limiting formula for gr at large internuclear separations: gr → mpμMb−2, in which μ is the molecular reduced mass and Mb is the mass of the separating cation, both in terms of atomic masses, and mp is the protonic rest mass.