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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 Emission Spectroscopy: Instrumentation01:22

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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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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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Scanning Electron Microscopy01:07

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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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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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Inductively Coupled Plasma Atomic Emission Spectroscopy: Principle01:19

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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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Single-shot electron radiography using a laser-plasma accelerator.

G Bruhaug1, M S Freeman2, H G Rinderknecht3

  • 1Laboratory for Laser Energetics, University of Rochester, Rochester, NY, 14623-1299, USA. gbruhaug@ur.rochester.edu.

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|February 9, 2023
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This summary is machine-generated.

Relativistic electron radiography was demonstrated using a laser-plasma accelerator, probing dense objects with high resolution. Electric field effects from laser ablation were observed and modeled, advancing imaging capabilities.

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Area of Science:

  • * Physics
  • * Materials Science
  • * Engineering

Background:

  • * Electron radiography offers a non-destructive method for probing material density and structure.
  • * Traditional electron sources have limitations in terms of energy and flux for certain applications.
  • * Laser-plasma accelerators provide a compact source of high-energy electrons.

Purpose of the Study:

  • * To demonstrate contact and projection electron radiography using a laser-plasma accelerator.
  • * To probe static targets with high areal densities.
  • * To investigate and model the influence of electric fields on radiography results.

Main Methods:

  • * Utilized a kilojoule, picosecond-class laser to drive a laser-plasma accelerator.
  • * Generated relativistic electrons with an average energy of 20 MeV.
  • * Probed objects made of various materials (plastic to tungsten) with areal densities up to 7.7 g/cm2.

Main Results:

  • * Achieved electron radiography with a resolution as fine as 90 μm.
  • * Successfully imaged objects with high areal densities.
  • * Observed and analytically described the impact of electric fields from laser ablation on image magnification.

Conclusions:

  • * Laser-plasma accelerators are viable sources for high-resolution electron radiography.
  • * The technique can probe dense materials effectively.
  • * Understanding and modeling electric field effects is crucial for accurate interpretation of electron radiographs.