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相关概念视频

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
Electronic Distance Measuring Instruments01:30

Electronic Distance Measuring Instruments

Electronic Distance Measuring Instruments (EDMs) are essential tools in modern surveying, offering precise distance measurements by emitting electromagnetic signals and calculating the time required for these signals to travel to a target and return. Two primary types of signals are used in EDMs — light waves and microwaves — each suited to specific environmental and distance requirements. Light-wave-based EDMs utilize either infrared or laser light, providing high accuracy over short distances...

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相关实验视频

Updated: Jun 28, 2026

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
08:01

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Published on: November 21, 2019

蒙莫里隆石:电子光学观测

N Güven

    Science (New York, N.Y.)
    |September 14, 1973
    PubMed
    概括
    此摘要是机器生成的。

    细粒度的米卡是摩洛哥和怀俄明州的蒙特莫里隆石中常见的杂质. 这些杂物会影响这些粘土矿物质中观察到的晶体结构和衍射模式.

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    Published on: November 21, 2019

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    科学领域:

    • 矿物学和粘土科学 矿物学和粘土科学
    • 地质化学 地质化学
    • 材料科学 材料科学 材料科学

    背景情况:

    • 蒙莫里隆石是以其可变的结构和应用而闻名的粘土矿物质.
    • 细粒度的米卡斯经常在各种地质构成中作为杂质被发现.
    • 了解杂质对粘土矿物结构的影响对于地质学和材料科学应用至关重要.

    研究的目的:

    • 调查Camp-Berteaux (摩洛哥) 和怀俄明州蒙特莫里隆石中的细粒米卡作为杂质的存在和影响.
    • 分析这些蒙特莫里隆石的晶体和结构特征,这些蒙特莫里隆石受到杂质的影响.
    • 为了比较来自不同地质位置的蒙莫里隆石之间的结构差异,当它们含有类似的杂质时.

    主要方法:

    • 选择区域电子衍射 (SAED) 用于分析米卡斯和蒙莫里隆石的晶体对称性.
    • 进行了微观结构观测,以描述粘土聚合物的形态和质地.
    • 评估了结晶度和结晶体大小,以区分研究样本的结构性质.

    主要成果:

    • 在Camp-Berteaux和怀俄明州的蒙特莫里隆石中,细粒米卡被确定为一致的杂质.
    • SAED模式显示了与杂质相关的三临床,单临床和六角对称性,与之前的蒙莫里隆石研究一致.
    • 坎普-贝尔特奥斯蒙特莫里隆石表现出折叠的,具有显著纹理的柔性多晶聚合物,而怀俄明蒙特莫里隆石显示出更好的结晶性和更大的结晶体大小,偏离了流层结构.

    结论:

    • 细粒米卡是研究的蒙特莫里隆石中无处不在的杂质,显著影响了它们的结构和衍射特性.
    • 杂质的存在影响了蒙特莫里隆石的观察到的对称性和微观结构特征.
    • 摩洛哥和怀俄明样本之间的结晶性和结构秩序的差异被突出显示,这表明不同的地质形成条件或沉积后历史.