...
首页> 外文期刊>Physics - Uspekhi >Current methods of structural neutronography
【24h】

Current methods of structural neutronography

机译:结构中子学的当前方法

获取原文
获取原文并翻译 | 示例
           

摘要

The Bragg-Wolf equation suggests two options for obtaining reflexes from a separate atomic plane, at a constant wavelength λ = λ_0 and variable angle of reflection Θ or at a constant Θ = Θ_0 and variable wavelength. In the former case (the constant wavelength method) which is most pften realized with continuous flux sources, the experiment is organized in the same manner as in the case of X-ray diffractometry. In the latter case, the relatively low velocity of thermal neutrons allows for the wavelength to be deduced from the time of neutron flight between the source and the detector using the de Broglie relation. The analog of this method [the time-of-flight (TOF) technique] is γ-quantum spectroscopy in diffraction experiments with X-rays or synchrotron radiation. In neutron diffractometry, the TOF technique is especially effective when pulse neutron sources are used. Its recent modification is the reverse TOF technique. These two methods, used in combination with up-to-date high-flux neutron sources, appear to be most promising for structural neutronography.
机译:布拉格-沃尔夫方程式提出了两种选择,用于在恒定波长λ=λ_0和可变反射角Θ或在恒定θ=θ_0和可变波长下从单独的原子平面获得反射。在前一种情况(恒定波长方法)中,最常使用连续通量源实现的实验,其组织方式与X射线衍射法相同。在后一种情况下,相对较低的热中子速度允许使用de Broglie关系从源与探测器之间的中子飞行时间推导出波长。这种方法的类似物[飞行时间(TOF)技术]是使用X射线或同步辐射的衍射实验中的γ量子光谱。在中子衍射法中,当使用脉冲中子源时,TOF技术尤其有效。它最近的修改是反向TOF技术。这两种方法与最新的高通量中子源结合使用,似乎对结构中子成像最有希望。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号