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相关概念视频

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

579
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
579
Mass Analyzers: Overview01:13

Mass Analyzers: Overview

611
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
611
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

343
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
343

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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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对于中子飞行时间粉微光度计的电子聚焦角度.

Robert B Von Dreele1

  • 1Advanced Photon Source Argonne National Laboratory 9700 South Cass Avenue Lemont IL60439-4814 USA.

Journal of applied crystallography
|October 10, 2024
PubMed
概括

这项研究介绍了一种能够创建伪常态波长模式的中子飞行时间粉微波量计. 这种方法简化了强度校正,并改善了粉末衍射分析.

科学领域:

  • 材料科学与工程 材料科学与工程
  • 凝聚物质物理学 凝聚物质物理学
  • 中子散射技术 中子散射技术

背景情况:

  • 中子粉衍射是材料表征的关键技术.
  • 精确的强度校正对于衍射实验中可靠的数据分析至关重要.
  • 传统的中子飞行时间 (TOF) 方法在取决于角度的校正方面存在挑战.

研究的目的:

  • 开发一个改进的中子飞行时间 (TOF) 粉末衍射仪.
  • 为了实现伪常态波长衍射模式的生成.
  • 为了促进粉末衍射中更精确的视角依赖强度校正.

主要方法:

  • 使用了配备广角探测器阵列的中子飞行时间 (TOF) 粉微波计.
  • 采用电子聚焦来合成伪常态波长衍射模式.
  • 分析了中子源排放配置文件对衍射峰值配置文件的影响.

主要成果:

  • 通过使用电子聚焦成功生成了伪常态波长衍射模式.
  • 证明了促进依赖角度的强度校正.
  • 观察到,由此产生的峰值配置文件受到中子源排放配置文件的影响.
关键词:
电子聚焦 电子聚焦 电子聚焦中子子粉的 difraktion 分散方式.配置文件形状功能 配置文件形状功能飞行时间的飞行时间.

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结论:

  • 开发的中子TOF衍射仪为粉末衍射数据处理提供了一种新的方法.
  • 电子聚焦提供了一种可行的方法来简化强度校正.
  • 这些发现有助于使用中子散射进行更精确的材料分析.