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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

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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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: 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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UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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The Lucy Thermal Emission Spectrometer (L'TES) Instrument.

P R Christensen1, V E Hamilton2, G L Mehall1

  • 1School of Earth and Space Exploration, Arizona State University, Tempe, AZ USA.

Space Science Reviews
|December 22, 2023
PubMed
Summary
This summary is machine-generated.

The Lucy Thermal Emission Spectrometer (L'TES) will measure Trojan asteroid thermophysical properties. This instrument, a copy of OTES, uses a Fourier Transform spectrometer for remote measurements, verifying its performance in space.

Keywords:
AsteroidLucyThermal emission spectrometerTrojan

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Area of Science:

  • Planetary Science
  • Astrophysics
  • Spectroscopy

Background:

  • The Lucy mission targets Trojan asteroids, necessitating remote sensing capabilities.
  • Understanding asteroid thermophysical properties is crucial for planetary formation studies.
  • Previous instruments like OTES on OSIRIS-REx provide a foundation for new mission hardware.

Purpose of the Study:

  • To detail the design and capabilities of the Lucy Thermal Emission Spectrometer (L'TES).
  • To outline the instrument's ability to remotely measure thermophysical properties of Trojan asteroids.
  • To confirm the instrument's readiness and performance through calibration and initial space data.

Main Methods:

  • Utilizing a Fourier Transform spectrometer (FTS) covering 5.71-100 μm.
  • Employing a Cassegrain telescope with a 15.2-cm aperture.
  • Incorporating a DLATGS pyroelectric detector and a metrology interferometer for precise control.

Main Results:

  • The L'TES instrument is a build-to-print copy of the OTES instrument.
  • It offers variable acquisition times (0.5, 1, 2 seconds) for different spectral resolutions.
  • Radiometric precision is ≤2.2 × 10⁻⁸ W cm⁻² sr⁻¹/cm⁻¹, with absolute temperature error <2 K for >75 K scenes.

Conclusions:

  • L'TES is a fully characterized instrument ready for its mission objectives.
  • Initial space data confirms the instrument's radiometric and spatial performance.
  • The instrument is poised to deliver key thermophysical data on Trojan asteroids.