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Gares, Katie (2017) UV RESONANCE RAMAN INVESTIGATION OF EXPLOSIVES’ UV PHOTOCHEMISTRY. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Detection of explosives has become an important field of research due to the increased number of terrorist attacks utilizing improvised explosive devices (IEDs). We show that UV resonance Raman (UVRR) spectroscopy is a sensitive and incisive technique for detection of explosives. Deep UV excitation of explosives gives resonance enhancement and greater sensitivity enabling trace detection of explosives and their photochemical products.
We demonstrate how we can utilize UVRR to analyze characteristic spectral changes that result from explosives’ photochemistry. In this work, we examined the 229 nm photochemistry of some of the main military explosives, TNT, RDX, and PETN in solution and solid state. We monitored the decrease in intensity of the UVRR bands of the initial explosive and the increase in intensity of the UVRR photoproduct bands during photolysis. Detection of photochemical product UVRR bands can be used to detect the previous presence of explosives even after they have been photolyzed. We determined solution state quantum yields, which gives insight to the susceptibility of the explosive to photolysis upon irradiation. We also determined the initial photoproducts formed by photolysis by using high performance liquid chromatography-high resolution mass spectrometry (HPLC-HRMS) measurements.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Gares, Katieklj36@pitt.eduklj36klj36
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairAsher,
Committee MemberGarrett-Roe,
Committee MemberWaldeck,
Committee MemberChen,
Date: 23 September 2017
Date Type: Publication
Defense Date: 26 July 2017
Approval Date: 23 September 2017
Submission Date: 4 August 2017
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 152
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Chemistry
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: resonance Raman, explosives, photochemistry, standoff detection, spectroscopy
Date Deposited: 24 Sep 2017 01:31
Last Modified: 23 Sep 2018 05:15


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