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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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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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Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

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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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Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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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...
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Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

343
In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
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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.
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¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

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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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Coincidence detection probability of(γ,2e)photoemission measurement.

Yuehua Su1, Kun Cao1, Chao Zhang1

  • 1Department of Physics, Yantai University, Yantai 264005, People's Republic of China.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|September 23, 2024
PubMed
Summary

The (gamma, 2e) photoemission technique detects two-body correlations in strongly correlated electrons. This method reveals the center-of-mass physics of electron pairs, crucial for understanding superconductors.

Keywords:
(γ2e) photoemission techniqueCooper pairssecond-order perturbation theorystrongly correlated electronstwo-body correlations

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Area of Science:

  • Condensed Matter Physics
  • Quantum Many-Body Theory

Background:

  • Direct detection of many-body correlations in strongly correlated electrons is a key challenge.
  • The (gamma, 2e) photoemission technique probes two-body correlations.

Purpose of the Study:

  • Focus on the (gamma, 2e) photoemission technique for correlated electrons near the Fermi energy.
  • Investigate the capability of this technique in revealing two-body correlations.

Main Methods:

  • Analyzing the coincidence detection probability in (gamma, 2e) photoemission.
  • Relating the probability to the two-body Bethe-Salpeter wave function.

Main Results:

  • The (gamma, 2e) technique is limited in resolving inner-pair structures due to electron-electron interactions.
  • Distinct resolution of the center-of-mass momentum and energy of the two-body Bethe-Salpeter wave function is achieved.

Conclusions:

  • The (gamma, 2e) photoemission technique provides insights into the center-of-mass physics of two-body correlations.
  • This technique is a potential tool for studying Cooper pairs in superconductors.