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Related Concept Videos

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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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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Spatial dimensions in atomic force microscopy: Instruments, effects, and measurements.

Ronald Dixson1, Ndubuisi Orji1, Ichiko Misumi2

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Summary
This summary is machine-generated.

Atomic force microscopy (AFM) is often considered 3D, but limitations exist. This study proposes a framework to analyze AFM dimensional characteristics, arguing no current AFM is fully 3D.

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Area of Science:

  • Surface science
  • Nanotechnology
  • Microscopy

Background:

  • Atomic force microscopes (AFMs) are widely perceived as capable of true three-dimensional imaging.
  • However, conventional AFMs exhibit functional constraints and imaging artifacts that limit their dimensional accuracy.
  • A lack of consensus exists regarding the characterization of spatial dimensions in AFM measurements.

Purpose of the Study:

  • To propose a framework for describing the dimensional characteristics of AFM images, instruments, and measurements.
  • To address the non-equivalence of the three axes in AFM data and performance.
  • To challenge the notion that current AFMs are fully three-dimensional.

Main Methods:

  • Conceptual framework development.
  • Analysis of instrumental and measurement effects on AFM data.
  • Comparative assessment of AFM axis characteristics.

Main Results:

  • Identified significant functional constraints and imaging artifacts in conventional AFMs.
  • Demonstrated non-equivalence among the three axes in terms of data characteristics and instrument performance.
  • Highlighted the lack of a universally accepted method for characterizing AFM dimensional accuracy.

Conclusions:

  • No currently available AFM system can be considered fully three-dimensional in all aspects.
  • A standardized framework is needed to accurately describe the dimensional capabilities of AFM.
  • Further research is required to overcome limitations and achieve true 3D imaging with AFMs.