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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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Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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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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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).
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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Inductively coupled plasma (ICP) is the most widely used plasma source in atomic emission spectroscopy (AES), also known as Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). The ICP source, or torch, consists of three concentric quartz tubes with argon gas flowing through them. A spark from a Tesla coil initiates the ionization of argon, generating a high-temperature plasma.
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Updated: Oct 15, 2025

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
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Linearized spectrum correlation analysis for thermal helium beam diagnostics.

T Nishizawa1, M Griener1, R Dux1

  • 1Max-Planck-Institut für Plasmaphysik, Boltzmannstr. 2, 85748 Garching, Germany.

The Review of Scientific Instruments
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Summary
This summary is machine-generated.

A novel correlation analysis technique enhances thermal helium beam diagnostics. This method effectively removes noise, enabling accurate measurement of electron density and temperature fluctuations even in low-light conditions.

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Area of Science:

  • Plasma physics
  • Fusion energy research
  • Diagnostic techniques

Background:

  • Thermal Helium Beam (THB) diagnostics are crucial for understanding plasma behavior in fusion devices.
  • Traditional methods relying on line ratios can be susceptible to noise and low signal-to-noise ratios.
  • Accurate measurement of plasma parameters like electron density and temperature is essential for reactor control and performance.

Purpose of the Study:

  • To develop a new correlation analysis technique for THB diagnostics.
  • To improve the accuracy and robustness of plasma parameter measurements under challenging conditions.
  • To enable high-resolution measurements of electron density and temperature fluctuations.

Main Methods:

  • Applied arithmetic operations to all available He I lines to construct new time series.
  • Utilized cross-correlation and ensemble averaging to remove uncorrelated noise.
  • Validated the technique using synthetic data and experimental data from ASDEX Upgrade tokamak.

Main Results:

  • Demonstrated the capability to derive power spectral densities of electron density and temperature.
  • Successfully measured plasma parameter fluctuations even under low-photon-count conditions.
  • Resolved electron density and temperature fluctuations up to 90 kHz in a high-power reactor scenario.

Conclusions:

  • The proposed correlation analysis technique offers a significant advancement in THB diagnostics.
  • This method enhances the reliability of plasma parameter measurements, particularly in noisy or low-light environments.
  • The technique's successful application at ASDEX Upgrade validates its potential for future fusion reactor diagnostics.