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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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Comparative Long-Wave Infrared Laser-Induced Breakdown Spectroscopy Employing 1-D and 2-D Focal Plane Array

Clayton S-C Yang1, Feng Jin1, Sudhir Trivedi1

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Sensors (Basel, Switzerland)
|February 11, 2023
PubMed
Summary

Researchers explored long-wave infrared (LWIR) emissions from laser-induced plasma using novel 2-D focal plane array detection. This advance significantly enhances molecular detection in LWIR laser-induced breakdown spectroscopy (LIBS).

Keywords:
atomic emissionlaser-induced breakdown spectroscopylaser-induced plasmalong-wave infrared spectroscopymolecular emission

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Area of Science:

  • Spectroscopy
  • Plasma Physics
  • Materials Science

Background:

  • Laser-induced breakdown spectroscopy (LIBS) traditionally uses UV/Vis/NIR wavelengths.
  • Limited investigation of long-wave infrared (LWIR) emissions from laser-induced plasma.
  • Understanding plasma dynamics and elemental/molecular composition is crucial for various applications.

Purpose of the Study:

  • To investigate LWIR emissions from laser-induced plasma on solid surfaces.
  • To evaluate the performance of a 2-D focal plane array (FPA) detector for LWIR LIBS.
  • To explore temporal and spatial characteristics of atomic and molecular emitters in plasma.

Main Methods:

  • Studied LWIR emissions from laser-induced plasma on potassium chloride and acetaminophen tablet surfaces.
  • Employed both 1-D linear array and novel 2-D FPA detection systems.
  • Analyzed spectral signatures for identification of atomic and molecular emitters, alongside temporal and spatial resolution.

Main Results:

  • Successfully identified atomic and molecular infrared emitters using spectral signatures.
  • Demonstrated significant enhancement in intensity and SNR for molecular emissions with 2-D FPA detection (up to 16x and 3.76x).
  • Observed LWIR LIBS signal intensities comparable to atomic emitters for intact molecules.

Conclusions:

  • Pioneering temporal and spatial investigations of LWIR plasma emissions advance plasma modeling.
  • 2-D FPA integration enhances LWIR LIBS for molecular detection, comparable to atomic detection.
  • Combined UV/Vis/NIR + LWIR LIBS offers comprehensive in situ, real-time, stand-off chemical analysis.