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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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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: 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...
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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.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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Visualization of Low-Level Gamma Radiation Sources Using a Low-Cost, High-Sensitivity, Omnidirectional Compton Camera
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Published on: January 30, 2020

Detecting axionlike particles with gamma ray telescopes.

Dan Hooper1, Pasquale D Serpico

  • 1Center for Particle Astrophysics, Fermi National Accelerator Laboratory, Batavia, Illinois 60510-0500, USA.

Physical Review Letters
|February 1, 2008
PubMed
Summary
This summary is machine-generated.

Axionlike particles (ALPs) could be detected by observing high-energy gamma-ray sources. Gamma rays may convert into ALPs in astrophysical magnetic fields, creating a unique spectral signature detectable by telescopes.

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Area of Science:

  • High-energy astrophysics
  • Particle physics
  • Cosmology

Background:

  • Axionlike particles (ALPs) are hypothetical particles proposed to solve problems in particle physics and cosmology.
  • Astrophysical accelerators, such as active galactic nuclei jets and radio galaxy hot spots, generate powerful magnetic fields.
  • The interaction between gamma rays and magnetic fields can lead to particle conversions, a phenomenon explored in astrophysics.

Purpose of the Study:

  • To propose a detectable signature of axionlike particles (ALPs) in high-energy gamma-ray spectra.
  • To investigate the conversion of gamma rays into ALPs within astrophysical magnetic fields.
  • To determine the observational capabilities for discovering this phenomenon.

Main Methods:

  • Theoretical modeling of gamma-ray to ALP conversion in astrophysical magnetic fields.
  • Application of the Hillas criterion to identify suitable astrophysical accelerators.
  • Analysis of spectral signatures in high-energy gamma-ray sources.

Main Results:

  • Axionlike particles (ALPs) with a two-photon vertex can produce a detectable signature in gamma-ray spectra.
  • Gamma rays can convert into ALPs in the magnetic fields of efficient astrophysical accelerators.
  • The proposed effect is observable by the GLAST (Gamma-ray Large Area Space Telescope) and ground-based TeV gamma-ray telescopes.

Conclusions:

  • The study provides a theoretical framework for detecting axionlike particles (ALPs) through astrophysical observations.
  • Observational evidence of gamma-ray to ALP conversion would support the existence of ALPs and offer insights into fundamental physics.
  • Future gamma-ray astronomy missions have the potential to discover axionlike particles, bridging particle physics and astrophysics.