title: Positron Binding Properties of Glycine and Its Aqueous Complexes.
abstract: We investigate positron binding to glycine and its aqueous complexes by first-principles calculation. We show that while glycine in its ground state (Gly) does not bind positrons, several of its strongly polar conformers do, and in particular, its zwitterion form (GlyZI) binds positrons strongly. Aqueous complexes Gly·nH2O and GlyZI·nH2O also bind positrons, if their dipole moment μ > μcr. However, μ is not a sufficient quantity to describe positron binding to these complexes. We show that in addition to μ, positron binding strongly depends on the intramolecular bonding of glycine. In Gly·nH2O, positrons are weakly bound to the nitrogen in Gly, whereas in GlyZI·nH2O, the ionic oxygen in GlyZI is a strong "positron attractor".
authors.affiliation: Department of Physics, Graduate School of Engineering, Yokohama National University , Yokohama 240-8501, Japan.|Department of Applied Physics, Aalto University School of Science , 02150 Espoo, Finland.
authors.forename: Mikko
authors.initials: M
authors.lastname: Nummela
authors.affiliation: Department of Physics, Graduate School of Engineering, Yokohama National University , Yokohama 240-8501, Japan.
authors.forename: Hannes
authors.initials: H
authors.lastname: Raebiger
authors.affiliation: Department of Physics, Graduate School of Engineering, Yokohama National University , Yokohama 240-8501, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Yoshida
authors.affiliation: Quantum Chemistry Division, Graduate School of NanoBioScience, Yokohama City University , Yokohama 236-0027, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Tachikawa