In:
Applied Spectroscopy, SAGE Publications, Vol. 73, No. 6 ( 2019-06), p. 601-609
Kurzfassung:
We demonstrate deep ultraviolet (UV) photoacoustic spectroscopy (PAS) of trace explosives using a sensitive microphone at meter standoff distances. We directly detect 10 µg/cm 2 of pentaerythritol tetranitrate (PETN), 2,4,6-trinitrotoluene (TNT), and ammonium nitrate (AN) with 1 s accumulations from a 3 m standoff distance. Large PAS signals for standoff detection are achieved by exciting into the absorption bands of the explosives with a 213 nm laser. We also investigate the impact of the deep UV photochemistry of AN on the PAS signal strength and stability. We find that production of gaseous species during photolysis of AN enhances the PAS signal strength. This deep UV photochemistry can, however, limit the PAS signal lifetimes when detecting trace quantities.
Materialart:
Online-Ressource
ISSN:
0003-7028
,
1943-3530
DOI:
10.1177/0003702818792289
Sprache:
Englisch
Verlag:
SAGE Publications
Publikationsdatum:
2019
ZDB Id:
1474251-2
SSG:
11
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