title: Spectroscopic observation of atomic hydrogen radicals entrapped in icy hydrogen hydrate.
abstract: A hydrogen molecule entrapped in the cages of icy hydrogen hydrate is confined in host water framework and thus behaves unlike pure solid or liquid hydrogen. The gamma-irradiated hydrogen radicals are for the first time observed from ESR and solid-state MAS 1H NMR spectra to stably exist in the icy hydrate channels without any collapse of the host framework, confirming the chemical shift consistency of ionized hydrogen derivatives. We discuss the confined icy hydrate channels, which can act as potential storage sites for simultaneously imprisoning both molecular and ionized hydrogen and further as icy nanoreactors.
authors.affiliation: Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Deajeon 305-701, Republic of Korea.
authors.forename: Sun-Hwa
authors.initials: SH
authors.lastname: Yeon
authors.forename: Jiwoong
authors.initials: J
authors.lastname: Seol
authors.forename: Youngjune
authors.initials: Y
authors.lastname: Park
authors.forename: Dong-Yeun
authors.initials: DY
authors.lastname: Koh
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Kang
authors.forename: Huen
authors.initials: H
authors.lastname: Lee
mesh_terms: D004578:Electron Spin Resonance Spectroscopy; D005609:Free Radicals / Q000737:chemistry; D006859:Hydrogen / Q000737:chemistry*; D007053:Ice; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D014867:Water / Q000737:chemistry*
chemical_list: D005609:Free Radicals; D007053:Ice; D014867:Water; D006859:Hydrogen