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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 68,
  • Issue 2,
  • pp. 226-231
  • (2014)

Mid-Infrared, Long Wave Infrared (4-12 μm) Molecular Emission Signatures from Pharmaceuticals Using Laser-Induced Breakdown Spectroscopy (LIBS)

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Abstract

In an effort to augment the atomic emission spectra of conventional laser-induced breakdown spectroscopy (LIBS) and to provide an increase in selectivity, mid-wave to long-wave infrared (IR), LIBS studies were performed on several organic pharmaceuticals. Laser-induced breakdown spectroscopy signature molecular emissions of target organic compounds are observed for the first time in the IR fingerprint spectral region between 4-12 μm. The IR emission spectra of select organic pharmaceuticals closely correlate with their respective standard Fourier transform infrared spectra. Intact and/or fragment sample molecular species evidently survive the LIBS event. The combination of atomic emission signatures derived from conventional ultraviolet-visible-near-infrared LIBS with fingerprints of intact molecular entities determined from IR LIBS promises to be a powerful tool for chemical detection.

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