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Related Concept Videos

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.
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

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 slanted or...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
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,...

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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Validating TRANSP simulations using neutron emission spectroscopy with dual sight lines.

C Hellesen1, E A Sundén, S Conroy

  • 1VR, Uppsala University, SE-75120 Uppsala, Sweden. carl.hellesen@fysast.uu.se

The Review of Scientific Instruments
|December 11, 2008
PubMed
Summary

A new method models neutron spectra from TRANSP simulations. Comparing modeled data with measurements from two spectrometers refines simulation parameters for better accuracy.

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Area of Science:

  • Nuclear Fusion Engineering
  • Plasma Physics
  • Neutron Spectroscopy

Background:

  • Accurate modeling of neutron spectra is crucial for understanding fusion plasma behavior.
  • The TRANSP code simulates bulk and fast ion distributions in fusion devices.
  • Neutron emission measurements provide critical data for validating plasma models.

Purpose of the Study:

  • To develop and validate a method for generating modeled neutron spectra from TRANSP simulations.
  • To compare modeled neutron spectra with experimental data from multiple neutron spectrometers.
  • To enhance the accuracy of TRANSP simulations by incorporating experimental constraints.

Main Methods:

  • Generating modeled neutron spectra using TRANSP simulations of ion distributions.
  • Utilizing data from two neutron spectrometers: TOFOR (radial line of sight) and MPRu (tangential line of sight).
  • Analyzing measured neutron spectra to extract information on emission from different ion populations.

Main Results:

  • Successful generation of modeled neutron spectra based on TRANSP simulations.
  • Comparison of modeled spectra with experimental data from TOFOR and MPRu.
  • Identification of discrepancies and constraints for improving TRANSP simulation parameters.

Conclusions:

  • The developed method provides a valuable tool for validating fusion plasma simulations.
  • Experimental neutron spectra data can effectively constrain and refine TRANSP simulation parameters.
  • Improved simulations lead to a better understanding of fusion plasma physics and performance.