title: Anomaly of CH4 molecular assembly confined in single-wall carbon nanohorn spaces.
abstract: Vibrational-rotational properties of CH(4) adsorbed on the nanopores of single-wall carbon nanohorns (SWCNHs) at 105-140 K were investigated using IR spectroscopy. The difference vibrational-rotational bands of the ν(3) and ν(4) modes below 130 K show suppression of the P and R branches, while the Q branches remain. The widths of the Q branches are much narrower than in the bulk gas phase due to suppression of the Doppler effect. These results indicate that the rotation of CH(4) confined in the nanospaces of SWCNHs is highly restricted, resulting in a rigid assembly structure, which is an anomaly in contrast to that in the bulk liquid phase.
authors.affiliation: Department of Chemistry, Graduate School of Science, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
authors.forename: Sachie
authors.initials: S
authors.lastname: Hashimoto
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Fujimori
authors.forename: Hideki
authors.initials: H
authors.lastname: Tanaka
authors.forename: Koki
authors.initials: K
authors.lastname: Urita
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ohba
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Kanoh
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Itoh
authors.forename: Michihiro
authors.initials: M
authors.lastname: Asai
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Sakamoto
authors.forename: Subaru
authors.initials: S
authors.lastname: Niimura
authors.forename: Morinobu
authors.initials: M
authors.lastname: Endo
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodriguez-Reinoso
authors.forename: Katsumi
authors.initials: K
authors.lastname: Kaneko