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Light filaments in air provide a unique opportunity to perform remote spectroscopic measurements. A study has been made into the detection of dinitrotoluene (DNT) and ammonium perchlorate using IR and UV filaments. UV filaments appear to have marked advantages in being able to capture clear spectroscopic signatures of these materials, in addition to propagating over longer distances.
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Mirell et al. (2008) studied this question.
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