https://www.selleckchem.com/pr....oducts/epacadostat-i
The rovibrational intervals of the ^4He_2^+ molecular ion in its X ^2Σ_u^+ ground electronic state are computed by including the nonadiabatic, relativistic, and leading-order quantum-electrodynamics corrections. Good agreement of theory and experiment is observed for the rotational excitation series of the vibrational ground state and the fundamental vibration. The lowest-energy rotational interval is computed to be 70.937 69(1 cm^-1 in agreement with the most recently reported experimental value, 70.937 589(23)(6_sy