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相关概念视频

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
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相关实验视频

Updated: May 20, 2025

Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application
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Synthesis and Characterization of High c-axis ZnO Thin Film by Plasma Enhanced Chemical Vapor Deposition System and its UV Photodetector Application

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第一次测量Z度样本在太阳内部条件附近的演变,使用时间分辨率光谱学.

G P Loisel1, J E Bailey1, T Nagayama1

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87185, USA.

Physical review letters
|March 25, 2025
PubMed
概括
此摘要是机器生成的。

高温铁的不透明度测量显示了持续的差异. 新的超快的X射线摄像机技术证实,时间梯度不能解释不透明模型中的这些差异.

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科学领域:

  • 血物理学的等离子体物理学
  • 天体物理建模天体物理建模
  • 在X射线光谱学中,

背景情况:

  • 对于铁在高温 (T>180 eV) 和密度 (ne>3x10^22 cm^-3) 时的透明度模型差异仍然存在,这与恒星内部有关.
  • 以前的实验依赖于X射线膜,限制了时间分辨率.

研究的目的:

  • 调查时间梯度在不透明模型数据差异中的作用.
  • 通过使用先进的成像技术,对模糊样本时间演变进行新的测量.

主要方法:

  • 采用了新的hCMOS超高速X射线摄像机技术,用于高分辨率的时间测量.
  • 在高温和高密度条件下测量不透明样本的时间演变.
  • 分析了测量条件,背光灯时间历史,并模拟了不透明度.

主要成果:

  • 证明时间梯度不能解决长期存在的铁不透明度模型数据差异.
  • 提供了对模糊性样本时间演变的第一个测量.

结论:

  • 时间梯度不是观察到的铁不透明差异的原因.
  • 新的hCMOS摄像头技术可以在更极端的条件下进行不透明度测量和光谱线位移分析.