title: Ab initio vibration and ro-vibrational spectrum of the 1A1 state of He2Si2+.
abstract: The low-lying ro-vibrational states for the ground electronic state (1A1) of HeSi2+ have been calculated using an ab initio variational solution of the nuclear Schrödinger equation. A 96 point CCSD(T)/cc-pCVQZ potential energy surface (PES) has been calculated and a Ogilvie-Padé (3,6) potential energy function has been generated. This force field was embedded in the Eckart-Watson Hamiltonian from which the vibrational and ro-vibrational eigenfunctions and eigenenergies have been variationally calculated. A 70 point QCISD/aug-cc-pCVTZ discrete dipole moment surface (DMS) was calculated and a 5th order power series expansion (in terms of the two bond lengths and the included bond angle) has been generated. Absolute line intensities have been calculated and are presented for some of the most intense transitions between the vibrational ground state and the low-lying ro-vibrational states of this ion.
authors: Department of Chemistry, School of Biological and Chemical Sciences, The University of Newcastle, Callaghan, NSW, Australia.
authors: Sudarko
authors: Jason M
authors: JM
authors: Hughes
authors: Ellak I
authors: EI
authors: von Nagy-Felsobuki
mesh_terms: D000465:Algorithms; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006371:Helium / Q000032:analysis / Q000737:chemistry*; D007477:Ions; D012825:Silicon / Q000032:analysis / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods*; D014732:Vibration
chemical_list: D007477:Ions; D006371:Helium; D012825:Silicon