Measurements of small organic molecules on the single crystal neutron diffractometers for biomolecules at JAERI

原研の生体高分子用単結晶回折計を用いた低分子結晶の回折測定

大原 高志   ; 栗原 和男; 玉田 太郎; 田中 伊知朗*; 新村 信雄*; 黒木 良太

Ohara, Takashi; Kurihara, Kazuo; Tamada, Taro; Tanaka, Ichiro*; Niimura, Nobuo*; Kuroki, Ryota

JRR-3炉室に設置された単結晶中性子回折計BIX-3及びBIX-4は、生体高分子用に設計されたものではあるが、入射中性子の波長を2.9Aから1.5Aに変更することで分子量の小さな有機化合物結晶の測定も可能となる。これらの回折計は検出器として大面積の中性子イメージングプレートを備えているため、比較的格子定数の大きな有機結晶の単結晶回折や繊維回折の測定を効率的に行うことができる。本発表では、BIX-3及びBIX-4の、低分子結晶用の回折計としての性能を紹介する。

Our group has two single crystal neutron diffractometers, called BIX-3 and BIX-4, in the JRR-3 reactor-hall at JAERI. Although these diffractometers were designed for bio-macromolecules, these can be used for diffraction measurement of small organic molecules by changing the wavelength of incident neutron beam from 2.9 to 1.5 . Since both BIX-3 and 4 has a large neutron imaging plate as a detector, they can efficiently collect the Bragg reflections of organic crystal which has relatively large unit cell, the longest value of cell dimension is 50 and typical value is 20 30 . In typical measurement, the crystal size is 1 3 mm, the measurement time is 1 2 weeks and the minimum -value is 0.8 . In addition, the large imaging plate also makes the efficient measurements of fiber diffraction possible. In this presentation, we introduce the performance of BIX-3 and 4 as diffractometers for small organic molecules.