Bound and quasibound states of HeH2+ and its isotopomers

Bound and quasibound states of HeH2+ and its isotopic variants have been co mputed on the recently reported ab initio potential energy surface by Palmi eri et al. [Mol. Phys. 98 (2000) 1835] using a time-dependent wave packet m ethodology. It is shown for the first time that the lowest energy bound sta tes for HeH2+ and HeD2+ in three dimensions are doublets, with a splitting of 7.0 and 4.8 cm(-1), respectively, Such a finding has profound implicatio ns for the interpretation of microwave and other spectra for the system. (C ) 2001 Elsevier Science B.V. All rights reserved.