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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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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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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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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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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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Acceptance-cone-tunable electron spectrometer for highly-efficient constant energy mapping.

Hiroyuki Yamane1, Fumihiko Matsui1, Takahiro Ueba1

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A new acceptance-cone-tunable (ACT) electron spectrometer enables efficient photoelectron mapping of materials. This innovation allows wide-angle observation without sample manipulation, enhancing material analysis.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Condensed Matter Physics

Background:

  • Efficient photoelectron mapping is crucial for understanding functional materials.
  • Traditional methods often require sample manipulation (rotation/tilting) for wide-angle observation.
  • Existing electron spectrometers have limitations in energy resolution and angular acceptance.

Purpose of the Study:

  • To develop a novel electron spectrometer for highly efficient constant-energy photoelectron mapping.
  • To achieve wide-angle observation of electronic band structures without sample rotation or tilting.
  • To demonstrate the performance of the acceptance-cone-tunable (ACT) spectrometer.

Main Methods:

  • Development of an acceptance-cone-tunable (ACT) electron spectrometer.
  • Integration of a hemispherical deflection analyzer with a mesh-type electrostatic lens.
  • Application of negative bias to the sample and grounding of the mesh lens/analyzer entrance to control photoelectron trajectory.

Main Results:

  • The ACT spectrometer demonstrated highly efficient constant-energy photoelectron mapping.
  • Successful wide-angle observation of the π-band dispersion in single crystalline graphite was achieved without sample manipulation.
  • The spectrometer's acceptance cone expanded by a factor of 3.30 under specific bias conditions.

Conclusions:

  • The developed ACT electron spectrometer offers a significant advancement for material analysis.
  • The ability to perform wide-angle mapping without sample movement enhances experimental efficiency.
  • This technology provides a powerful tool for investigating the electronic properties of functional materials.