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Title: 中性子散乱で見るメタンハイドレートの動的構造
Other Titles: Dynamical structure of methane hydrate by neutron inelastic scattering
Authors: 加美山, 隆1 Browse this author →KAKEN DB
鬼柳, 善明2 Browse this author →KAKEN DB
岩佐, 浩克3 Browse this author
内田, 努4 Browse this author →KAKEN DB
海老沼, 孝郎5 Browse this author
成田, 英夫6 Browse this author
Bennington, Stephen M. Browse this author
Authors(alt): Kamiyama, Takashi1
Kiyanagi, Yoshiaki2
Iwasa, Hirokatsu3
Uchida, Tsutomu4
Ebinuma, Takao5
Narita, Hideo6
Issue Date: 22-Mar-2006
Publisher: 北海道大学低温科学研究所
Journal Title: 低温科学
Journal Title(alt): Low temperature science
Volume: 64
Start Page: 215
End Page: 222
Abstract: 中性子が物質中の原子や分子の熱運動程度のエネルギーを持つと,その波長は原子サイズのオーダー になる.これにより,X線の回折と同様な条件の下,凝集体の回折現象の測定が可能となるうえ,原 子・分子の熱運動と中性子の間のエネルギーのやり取りを観測しやすい.つまり,中性子散乱実験で は,凝集体の空間的な構造と運動に関する情報,すなわち動的構造を一挙に得ることが可能となる. ここでは,この中性子散乱測定の特長を活かしてメタンハイドレートの測定を行い,得られた3次元 的な構造を持つスペクトルからメタン分子の微視的な運動を詳細に解析した例を示す.
Clathrate hydrates are nonstoichiometric inclusion compounds with a host framework composed of water molecules. Methane hydrate consists of two kinds of water cages, two pentagonal dodecahedra and six tetrakaidecahedra in a unit cell,which contains one methane molecule in each. It has been said that the methane molecule rotates almost free in the cage. We made measurements of dynamical structure factors over the wide Q-E space using neutron inelastic scattering. The obtained dynamical structure factor S(Q,E) of methane hydrate shows a characteristic feature in Q-E space. The rotational levels of methane coincide with those of a free methane molecule and show a recoil like behavior in the high Q region, meaning that methane molecules in methane hydrate rotate almost freely.
Description: 3章 クラスレートハイドレート研究のフロンティア
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第64巻

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