Deep Ultraviolet Standoff Photoacoustic Spectroscopy of Trace Explosives

Applied Spectroscopy
Alyssa B ZrimsekSanford A Asher

Abstract

We demonstrate deep ultraviolet (UV) photoacoustic spectroscopy (PAS) of trace explosives using a sensitive microphone at meter standoff distances. We directly detect 10 µg/cm2 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.

References

May 7, 2009·Analytical and Bioanalytical Chemistry·Jennifer L GottfriedAndrzej W Miziolek
Apr 24, 2010·Applied Spectroscopy·David D TuschelSanford A Asher
Apr 6, 2011·The Journal of Physical Chemistry. a·Sanford A AsherSteven J Geib
Jan 24, 2012·Talanta·J Sarah CaygillSeamus P J Higson
Aug 18, 2012·The Journal of Chemical Physics·Raja S ChellappaStephen Sheffield
Feb 26, 2013·The Journal of Physical Chemistry. a·Jason K CooperJin Z Zhang
May 9, 2013·Sensors·Ellen L HolthoffPaul M Pellegrino
Apr 4, 2015·The Review of Scientific Instruments·J S LiA P Yalin
Jun 25, 2016·Applied Spectroscopy·Logan S MarcusPaul M Pellegrino
Sep 26, 2017·The Journal of Physical Chemistry. a·Katie L GaresSanford A Asher

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Citations

Sep 16, 2020·Scientific Reports·Ramesh C SharmaSurya N Thakur
Jan 2, 2021·Forensic Science International : Synergy·Douglas J KlapecJulie Pannuto

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Methods Mentioned

BETA
irradiating

Software Mentioned

Python
PAS

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