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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: Overview01:20

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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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Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

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Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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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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Radiative ablation with two ionizing fronts when opacity displays a sharp absorption edge.

Olivier Poujade1, Max Bonnefille1, Marc Vandenboomgaerde1

  • 1CEA, DAM, DIF, F-91297 Arpajon, France.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|December 15, 2015
PubMed
Summary
This summary is machine-generated.

A second ionizing front (I-front), or edge front, can form when material opacity has a sharp spectral edge. This phenomenon, explained in the article, helps understand edge-shocks in inertial confinement fusion (ICF) and astrophysical ablative flows.

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Area of Science:

  • Plasma Physics
  • Astrophysics
  • Fusion Energy

Background:

  • Ionizing fronts (I-fronts) are crucial in astrophysics and inertial confinement fusion (ICF).
  • I-fronts drive matter motion when intense radiation interacts with materials.
  • Continuous opacity variations typically result in a single I-front.

Purpose of the Study:

  • To describe the mechanism behind the formation of a second I-front, termed an edge front.
  • To explain the origin of edge-shocks observed in ICF simulations.
  • To assess the implications of edge fronts in ICF and astrophysics.

Main Methods:

  • Numerical simulations of photon-matter interaction.
  • Analysis of I-front dynamics under varying opacity conditions.
  • Theoretical modeling of edge front formation.

Main Results:

  • A second I-front (edge front) forms when material opacity exhibits a sharp spectral edge.
  • This edge front can lead to the formation of edge-shocks.
  • The study provides a comprehensive description of the edge front formation mechanism.

Conclusions:

  • Edge fronts and associated edge-shocks are a consequence of sharp spectral opacity edges.
  • Understanding edge fronts is vital for the robustness of ICF capsule design.
  • The findings have potential applications in astrophysical scenarios involving ablative flows.