title: Convergence of experiment and theory on the pure vibrational spectrum of HeH(+).
abstract: Very accurate quantum mechanical calculations of the pure vibrational spectrum of the molecular ion are reported and compared with newly obtained pure vibrational transitions extracted from the available experimental data. The calculations are performed without assuming the Born-Oppenheimer approximation regarding separability of the nuclear and electronic motions and include the first order relativistic mass-velocity and Darwin corrections. For the two lowest transitions, whose experimental energies are established with the highest precision, the calculated and the experimental results show very good agreement.
authors.affiliation: Institute of Physics, Nicholas Copernicus University, ul. Grudziadzka 5, PL 87-100 Toruń, Poland.
authors.forename: Monika
authors.initials: M
authors.lastname: Stanke
authors.forename: Dariusz
authors.initials: D
authors.lastname: Kedziera
authors.forename: Marcin
authors.initials: M
authors.lastname: Molski
authors.forename: Sergiy
authors.initials: S
authors.lastname: Bubin
authors.forename: Maria
authors.initials: M
authors.lastname: Barysz
authors.forename: Ludwik
authors.initials: L
authors.lastname: Adamowicz