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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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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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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.
The ions and electrons produced interact with the fluctuating magnetic field created by a water-cooled...
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Atomic Emission Spectroscopy: Interference01:30

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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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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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Measured Emittance Dependence on the Injection Method in Laser Plasma Accelerators.

S K Barber1, J van Tilborg1, C B Schroeder1

  • 1Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.

Physical Review Letters
|September 27, 2017
PubMed
Summary
This summary is machine-generated.

Shock-induced density down-ramp injection in laser plasma accelerators (LPAs) yields electron beams with half the normalized emittance compared to ionization injection. This finding is crucial for developing advanced LPA applications demanding high charge density and low emittance.

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Area of Science:

  • Plasma Physics
  • Accelerator Physics
  • Laser-Plasma Interactions

Background:

  • Laser plasma accelerators (LPAs) are promising for generating high-quality electron beams.
  • Controlling beam emittance is critical for LPA applications.
  • Different injection mechanisms, such as ionization injection and density down-ramp injection, produce beams with varying properties.

Purpose of the Study:

  • To compare the normalized emittances of electron beams produced by two distinct injection mechanisms in a tunable LPA.
  • To assess the impact of injection method on beam quality for potential LPA applications.

Main Methods:

  • Utilized a tunable laser plasma accelerator (LPA) setup.
  • Performed single-shot, charge-dependent emittance measurements.
  • Employed shock-induced density down-ramp injection and ionization injection mechanisms.
  • Ensured comparable central energy and peak spectral charge density between beams from both methods.

Main Results:

  • Electron beams generated via shock-induced density down-ramp injection exhibited normalized emittances two times smaller than those from ionization injection.
  • The tunable LPA setup enabled a direct, quantitative comparison of the two injection techniques.

Conclusions:

  • Shock-induced density down-ramp injection is a superior mechanism for producing low-emittance electron beams in LPAs.
  • These findings are vital for advancing LPA technology towards applications requiring high charge density and low emittance.