title: Infrared spectroscopic evidence for protonated water clusters forming nanoscale cages.
abstract: Size-dependent development of the hydrogen bond network structure in large sized clusters of protonated water, H+(H2O)n (n = 4 to 27), was probed by infrared spectroscopy of OH stretches. Spectral changes with cluster size demonstrate that the chain structures at small sizes (n less, similar 10) develop into two-dimensional net structures (approximately 10 < n < 21), and then into nanometer-scaled cages (n >/= 21).
authors.affiliation: Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Miyazaki
authors.forename: Asuka
authors.initials: A
authors.lastname: Fujii
authors.forename: Takayuki
authors.initials: T
authors.lastname: Ebata
authors.forename: Naohiko
authors.initials: N
authors.lastname: Mikami