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Related Concept Videos

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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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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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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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.
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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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Photon Ring Astrometry for Superradiant Clouds.

Yifan Chen1, Xiao Xue2,3, Richard Brito4

  • 1Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, 2100 Copenhagen, Denmark.

Physical Review Letters
|March 31, 2023
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This summary is machine-generated.

Spinning black holes can detect ultralight bosons by forming "gravitational atoms." These boson clouds cause detectable light deflection, offering new ways to search for dark matter candidates.

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Area of Science:

  • Astrophysics
  • Particle Physics
  • General Relativity

Background:

  • Spinning black holes can extract rotational energy via superradiance.
  • Ultralight bosons could form dense 'gravitational atom' clouds around black holes.
  • These clouds induce metric perturbations, affecting light paths.

Purpose of the Study:

  • To explore black holes as detectors for ultralight bosons.
  • To investigate the potential of gravitational atoms for dark matter detection.
  • To analyze the detectability of boson-induced light deflection.

Main Methods:

  • Modeling gravitational atom formation and properties.
  • Simulating the effect of oscillating boson clouds on photon geodesics.
  • Analyzing photon ring autocorrelations using Event Horizon Telescope data.

Main Results:

  • Gravitational atoms can achieve high energy densities, exceeding dark matter.
  • Boson clouds cause significant deflection of photon geodesics.
  • Deflection is amplified near critical photon orbits.

Conclusions:

  • Black holes serve as promising detectors for ultralight bosons.
  • Event Horizon Telescope can probe unexplored parameter space for boson clouds.
  • Photon ring autocorrelations offer a viable detection strategy.