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Updated: May 5, 2026

Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization
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Electron Channeling Contrast Imaging for Rapid III-V Heteroepitaxial Characterization

Published on: July 17, 2015

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两维化的近红外短波线性二极化

Xiaoting Wang1, Yongtao Li1, Le Huang1

  • 1State Key Laboratory of Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences & College of Materials Science and Optoelectronic Technology, University of Chinese Academy of Sciences , Beijing 100083, China.

Journal of the American Chemical Society
|September 20, 2017
PubMed
概括

少数层的化物 (GeSe) 在短波近红外 (SW-NIR) 光谱中表现出显著的偏振依赖光学特性. 这种二维材料表现出强烈的异构反应,使其适用于先进的SW-NIR偏振检测应用.

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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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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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