title: Relativistic corrections to the non-Born-Oppenheimer energies of the lowest singlet Rydberg states of 3He and 4He.
abstract: In this work the authors present an approach to calculate the leading-order relativistic corrections for ground and excited states of helium isotopomers. In the calculations they used variational wave functions expanded in terms of explicitly correlated Gaussians obtained without assuming the Born-Oppenheimer approximation.
authors.affiliation: Department of Chemistry, University of Arizona, Tucson, Arizona 85721 and 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: Sergiy
authors.initials: S
authors.lastname: Bubin
authors.forename: Ludwik
authors.initials: L
authors.lastname: Adamowicz