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Performance of a multi-wavelength monochromator system for neutron single-crystal and powder diffraction

単結晶及び粉末回折のための多波長モノクロメータシステムの性能

Ahmed, F. U.*; 田中 伊知朗; 新村 信雄

Ahmed, F. U.*; Tanaka, Ichiro; Niimura, Nobuo

時間のかかる中性子回折データの収集効率を大幅に上げるため、弾性湾曲完全結晶Si(111)及びSi(220)結晶を2枚重ね合せたモノクロメータ装置を使い、単結晶と粉末中性子回折において、多波長をうまく使用する方法を確立した。この実験には3号炉のTAS-2を用いた。Si(220)からは1.80Å、Si(111)からは2.94Åの2波長を用いた。モノクロメータの重ね合せ方位調整はうまくいき、ロッキングカーブは約0.3度の半値幅になった。粉末Siの回折パターンを中性子イメージングプレート(NIP)で撮影してみると、2波長からの反射が、スリット無しの条件で、高強度、高統計、高位置分解能で、同時にとることができた。有機化合物単結晶からの回折斑点もNIPで撮影に成功した。各波長からの回折リング、回折斑点は、間違いなく区別が可能であった。

In order to improve significantly data collection efficiency, the advantages of using multi-wavelengths in single-crystal neutron diffraction as well as in powder neutron diffraction were established by experiments using a stacked monochromator assembly of two elastically bent perfect Si(111) and Si(220) crystals. The TAS-2 spectrometer on JRR-3M at JAERI was employed for these experiments. Each crystal was elastically bent in order to increase the flux density at the sample position. Two wavelengths, $$lambda$$1=1.80$AA  for Si(220) and $lambda$$2=2.94$AA  for Si(111), were selected. With the neutron imaging plate (NIP) detector, it was possible to aquire multiple reflections simultaneously with better intensity, better statistics and higher spatial resolution with an open geometry. As a single crystal sample an organic compound piperidine cobaloxime was used. For the systems investigated in this study, it was possible to assign unambiguously rings or spots to diffraction by $lambda$$1 or by $$lambda$$2 in the case of powder and single-crystal diffraction on the NIP.

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