title: Ammonia-hydrogen bromide and ammonia-hydrogen iodide complexes: anion photoelectron and ab initio studies.
abstract: The ammonia-hydrogen bromide and ammonia-hydrogen iodide, anionic heterodimers were studied by anion photoelectron spectroscopy. In complementary studies, these anions and their neutral counterparts were also investigated via ab initio theory at the coupled cluster level. In both systems, neutral NH(3)...HX dimers were predicted to be linear, hydrogen-bonded complexes, whereas their anionic dimers were found to be proton-transferred species of the form, (NH(4)(+)X(-))(-). Both experimentally measured and theoretically predicted vertical detachment energies (VDE) are in excellent agreement for both systems, with values for (NH(4)(+)Br(-))(-) being 0.65 and 0.67 eV, respectively, and values for (NH(4)(+)I(-))(-) being 0.77 and 0.81 eV, respectively. These systems are discussed in terms of our previous study of (NH(4)(+)Cl(-))(-).
authors.affiliation: Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
authors.forename: S N
authors.initials: SN
authors.lastname: Eustis
authors.forename: A
authors.initials: A
authors.lastname: Whiteside
authors.forename: D
authors.initials: D
authors.lastname: Wang
authors.forename: M
authors.initials: M
authors.lastname: Gutowski
authors.forename: K H
authors.initials: KH
authors.lastname: Bowen
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D000838:Anions / Q000737:chemistry; D019281:Dimerization; D018054:Hydrobromic Acid / Q000737:chemistry*; D006860:Hydrogen Bonding; D007454:Iodides / Q000737:chemistry*; D011789:Quantum Theory; D013057:Spectrum Analysis
chemical_list: D000838:Anions; D007454:Iodides; D018054:Hydrobromic Acid; D000641:Ammonia