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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

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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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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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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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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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Multiscattering-enhanced absorption spectroscopy.

Volodymyr B Koman1, Christian Santschi, Olivier J F Martin

  • 1Nanophotonics and Metrology Laboratory (NAM), Swiss Federal Institute of Technology (EPFL) , CH-1015 Lausanne, Switzerland.

Analytical Chemistry
|December 30, 2014
PubMed
Summary
This summary is machine-generated.

A new multiscattering-enhanced absorption spectroscopy (MEAS) technique uses dielectric beads to amplify light scattering, significantly improving sensitivity and lowering detection limits for various analytes.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Conventional absorption spectroscopy offers simplicity and low cost but lacks sensitivity for low analyte concentrations.
  • Enhancing optical path length is crucial for improving sensitivity in absorption-based detection methods.

Purpose of the Study:

  • To present a novel multiscattering-enhanced absorption spectroscopy (MEAS) technique for sensitive analyte detection.
  • To demonstrate the versatility and effectiveness of MEAS across various analytes and detection formats.
  • To investigate and optimize parameters influencing the scattering medium for tailored sensitivity enhancement.

Main Methods:

  • Development of a multiscattering-enhanced absorption spectroscopy (MEAS) technique utilizing dielectric beads.
  • Extending the optical path length within the sensing volume through controlled light scattering.
  • Experimental and numerical investigation of scattering medium parameters and their impact on sensitivity.

Main Results:

  • Achieved significant improvements in sensitivity and lower limits of detection compared to conventional absorption spectroscopy.
  • Demonstrated a 7.2-fold decrease in the limit of detection for phenol red and a 3.3-fold decrease for gold nanoparticles and dye.
  • Successfully applied MEAS to enhance colorimetric detection with gold nanoparticle probes and a hydrogen peroxide bioassay.

Conclusions:

  • Multiscattering-enhanced absorption spectroscopy (MEAS) offers a versatile, sensitive, and cost-effective approach for low-concentration analyte detection.
  • The technique's sensitivity can be tailored by optimizing scattering medium parameters, enabling broad applicability.
  • MEAS represents a significant advancement for absorption spectroscopy, particularly in fields requiring high sensitivity detection.