title: Structures and transition states of Ge2CH2.
abstract: In this study a systematic theoretical investigation of Ge2CH2 is carried out. The singlet potential energy surface (PES) was explored using state-of-the-art theoretical methods including self-consistent field (SCF), coupled cluster theory incorporating single and double excitation (CCSD), perturbative triple [CCSD(T)] and full triples [CCSDT] with perturbative quadruple (Q), together with a variety of correlation-consistent polarized valence basis sets cc-pVXZ (where X = D, T, and Q). A total of eleven stationary points have been located on the Ge2CH2 singlet ground state PES. Among them, seven structures are minima (1S-7S), two are transition states (TS1 and TS2), and two are second-order saddle points (SSP1 and SSP2). The global minimum is predicted to be an exotic hydrogen-bridged structure 1S. The energy ordering of the seven minima (in kcal mol(-1)) obtained from focal point analysis using the extrapolation to complete basis set (CBS) limit with zero point vibrational energy (ZPVE), core correlation, diagonal Born-Oppenheimer (DBOC) and relativistic correction is 1S [0.0] < 2S [17.2] < 3S [18.3] < 4S [31.7] < 5S [39.9] < 6S [58.1] < 7S [82.1].
authors.affiliation: Center for Computational Quantum Chemsitry, University of Georgia, Athens, Georgia 30602, United States.
authors.forename: Stefan
authors.initials: S
authors.lastname: Vogt-Geisse
authors.forename: Alexander Yu
authors.initials: AY
authors.lastname: Sokolov
authors.forename: Shane R
authors.initials: SR
authors.lastname: McNew
authors.forename: Yukio
authors.initials: Y
authors.lastname: Yamaguchi
authors.forename: Henry F
authors.initials: HF
authors.lastname: Schaefer