日本結晶学会誌
Online ISSN : 1884-5576
Print ISSN : 0369-4585
ISSN-L : 0369-4585
1.新時代の結晶学-X線自由電子レーザー
超短パルス粉末X線回折による光励起ピコ秒構造相転移計測技術の開発
松原 英一郎徳田 一弥河口 智也山田 昇
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2014 年 56 巻 1 号 p. 15-21

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We are developing an ultra-short pulse powder X-ray diffraction method using X-ray pulses of high brilliance and femtosecond pulse width from the X-ray free-electron laser apparatus in SACLA, Japan. The distinctive feature of this method is detection of anisotropic crystal structure deformation during non-thermal process. We have applied this method to some materials, including chalcogenide Ge-Sb-Te, porous coordination polymers, hydroxyhydrides, etc. In this review, we will introduce some preliminary results of observation of photo-induced anisotropic lattice expansion in a non-thermal process in a metastable face-centered cubic Ge2Sb2Te5 crystal.

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