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相关概念视频

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

179
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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¹H NMR: Interpreting Distorted and Overlapping Signals01:02

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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
198
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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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.
365
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences01:20

Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

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Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and...
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Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
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脉冲相互作用诱导了双光谱学中的系统错误.

Mathieu Walsh, Esther Baumann, Nathan Malarich

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    此摘要是机器生成的。

    双光谱学的系统性错误源于常见纤维的传播. 这些错误会扭曲光谱线形状和度,影响分子气体分析.

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    科学领域:

    • 频谱学是一种光谱学.
    • 非线性光学是非线性光学.
    • 物理化学 物理化学

    背景情况:

    • 双光谱 (DCS) 是一种用于分子气体分析的强大技术.
    • 系统性错误可能会损害DCS测量的准确性.
    • 双脉冲的通用纤维传播是潜在的错误来源.

    研究的目的:

    • 调查由普通纤维传播引起的DCS系统错误的起源和影响.
    • 确定导致这些光谱扭曲的物理机制.
    • 在不同的实验条件下量化错误的大小.

    主要方法:

    • 双干扰图的模拟,使用一般化的非线性施罗丁格方程.
    • 分析光谱扭曲,线形和检索的度.
    • 自相调制和交相调制效应的建模.

    主要成果:

    • 发现了两个主要的错误机制:自相调制 (SPM) 和交相调制 (XPM).
    • SPM改变了光谱含量,影响了基线和吸收特征,导致线强度错误.
    • XPM修改了脉冲间延迟,导致采样错误和不对称的光谱线扭曲.
    • 模拟准确地复制实验误差大小 (0.1%在10mW/10m,随功率和光纤长度增加).

    结论:

    • 在DCS中常见纤维传播引入了显著的系统错误.
    • SPM和XPM是导致光谱线形状和强度不准确性的关键因素.
    • 了解这些错误对于使用DCS.精确的分子气体度检索至关重要.