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Related Concept Videos

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

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Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
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2D NMR: Overview of Heteronuclear Correlation Techniques01:18

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Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other...
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Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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2D NMR: Overview of Homonuclear Correlation Techniques01:16

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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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Updated: Feb 20, 2026

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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Microscanning in Hadamard spectroscopy.

Cristian Damian, Adrian Sima, Tiberius Vasile

    Applied Optics
    |October 20, 2017
    PubMed
    Summary
    This summary is machine-generated.

    Microscanning enhances Hadamard spectroscopy by combining low-resolution spectra to improve signal-to-noise ratio in far-infrared applications. This technique effectively reduces noise, making it valuable for spectral analysis where sensor noise is significant.

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    Area of Science:

    • Spectroscopy
    • Optical Physics
    • Materials Science

    Background:

    • Hadamard spectroscopy is effective in noise-dominant regions like the far-infrared.
    • Current limitations include poor signal-to-noise ratio scaling with resolution.

    Purpose of the Study:

    • To analyze the microscanning technique for improving Hadamard spectroscopy resolution and signal-to-noise ratio.
    • To assess the trade-offs between noise reduction and accuracy loss due to blurring.

    Main Methods:

    • Theoretical analysis of microscanning's noise reduction and blurring effects.
    • Simulations using measured far-infrared mineral spectra.
    • Experimental demonstration of the microscanning method.

    Main Results:

    • Microscanning achieves noise reduction proportional to the number of combined low-resolution spectra.
    • The method's effectiveness was validated through simulations and experiments.
    • Analysis indicates potential for significant noise reduction in far-infrared spectroscopy.

    Conclusions:

    • Microscanning offers a viable solution to enhance signal-to-noise ratio in Hadamard spectroscopy.
    • The technique is particularly beneficial for far-infrared spectroscopy applications.
    • Balancing noise reduction and accuracy is key for optimal implementation.