title: Radiative cooling of H3O+and its deuterated isotopologues.
abstract: In conjunction with ab initio potential energy and dipole moment surfaces for the electronic ground state, we have made a theoretical study of the radiative lifetimes for the hydronium ion H3O+and its deuterated isotopologues. We compute the ro-vibrational energy levels and their associated wavefunctions together with Einstein coefficients for electric dipole transitions. A detailed analysis of the stability of the ro-vibrational states has been carried out and the longest-living states of the hydronium ions have been identified. We report estimated radiative lifetimes and cooling functions for temperatures <200 K. A number of long-living meta-stable states are identified, capable of population trapping.
authors.affiliation: Siberian Institute of Physics & Technology, Tomsk State University, Tomsk, 634050, Russia.
authors.forename: Vladlen V
authors.initials: VV
authors.lastname: Melnikov
authors.affiliation: Department of Physics & Astronomy, University College London, London WC1E 6BT, UK. s.yurchenko@ucl.ac.uk.
authors.forename: Sergei N
authors.initials: SN
authors.lastname: Yurchenko
authors.affiliation: Department of Physics & Astronomy, University College London, London WC1E 6BT, UK. s.yurchenko@ucl.ac.uk.
authors.forename: Jonathan
authors.initials: J
authors.lastname: Tennyson
authors.affiliation: Physikalische und Theoretische Chemie, Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany.
authors.forename: Per
authors.initials: P
authors.lastname: Jensen