title: Asymmetric transport efficiencies of positive and negative ion defects in amorphous ice.
abstract: Hydronium (H(3)O(+)) ions at an ice surface penetrate into its interior over a substantially longer distance than hydroxide (OH(-)) ions. The observation was made by conducting reactive ion scattering and infrared spectroscopic measurements for the acid-base reaction between surface H(3)O(+) (or OH(-)) and NH(3) (or NH(4)(+)) trapped inside an amorphous ice film at low temperature (<100 K). The study reveals very different transport efficiencies of positive and negative ion defects in ice. This difference is explained by the occurrence of an efficient proton-relay channel for H(3)O(+), which does not exist for OH(-).
authors.affiliation: Department of Chemistry, Seoul National University, 1 Gwanak-ro, Seoul 151-747, Republic of Korea.
authors.forename: Eui-seong
authors.initials: ES
authors.lastname: Moon
authors.forename: Youngsoon
authors.initials: Y
authors.lastname: Kim
authors.forename: Sunghwan
authors.initials: S
authors.lastname: Shin
authors.forename: Heon
authors.initials: H
authors.lastname: Kang