Abstract
Laser-induced breakdown spectroscopy (LIBS) has shown great promise for
applications in chemical, biological, and explosives sensing and has significant
potential for real-time standoff detection and analysis. In this study, LIBS
emissions were obtained in the mid-infrared (MIR) and long-wave infrared (LWIR)
spectral regions for potential applications in explosive material sensing. The IR
spectroscopy region revealed vibrational and rotational signatures of functional
groups in molecules and fragments thereof. The silicon-based detector for
conventional ultraviolet-visible LIBS operations was replaced with a
mercury-cadmium-telluride detector for MIR-LWIR spectral detection. The IR spectral
signature region between 4 and 12 µm was mined for the appearance of MIR and
LWIR-LIBS emissions directly indicative of oxygenated breakdown products as well as
dissociated, and/or recombined sample molecular fragments. Distinct LWIR-LIBS
emission signatures from dissociated-recombination sample molecular fragments
between 4 and 12 µm are observed for the first time.
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Rapid long-wave infrared laser-induced breakdown spectroscopy measurements using a mercury-cadmium-telluride linear array detection system
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