In-source collision induced dissociation of inorganic explosives for mass spectrometric signature detection and chemical imaging |
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Affiliation: | 1. Department of Forensic and Investigative Science, West Virginia University, Morgantown, WV 26506-6121, USA;2. C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV 26506-6121, USA;1. National Institute of Standards and Technology, Materials Measurement Laboratory, 100 Bureau Drive, Gaithersburg, MD 20899;2. Defense Forensic Science Center, Gillem Enclave, Forest Park, GA 30297;3. University of Central Florida/National Center for Forensic Science, P.O. Box 162367 Orlando, FL 32816, USA;1. National Institute of Standards and Technology, Materials Measurement Science Division, Gaithersburg, MD, USA;2. National Institute of Standards and Technology, Statistical Engineering Division, Gaithersburg, MD, USA |
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Abstract: | The trace detection, bulk quantification, and chemical imaging of inorganic explosives and components was demonstrated utilizing in-source collision induced dissociation (CID) coupled with laser desorption/ionization mass spectrometry (LDI-MS). The incorporation of in-source CID provided direct control over the extent of adduct and cluster fragmentation as well as organic noise reduction for the enhanced detection of both the elemental and molecular ion signatures of fuel-oxidizer mixtures and other inorganic components of explosive devices. Investigation of oxidizer molecular anions, specifically, nitrates, chlorates, and perchlorates, identified that the optimal in-source CID existed at the transition between fragmentation of the ionic salt bonds and molecular anion bonds. The chemical imaging of oxidizer particles from latent fingerprints was demonstrated, including both cation and anion components in positive and negative mode mass spectrometry, respectively. This investigation demonstrated LDI-MS with in-source CID as a versatile tool for security fields, as well as environmental monitoring and nuclear safeguards, facilitating the detection of elemental and molecular inorganic compounds at nanogram levels. |
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Keywords: | In-source collision induced dissociation Mass spectrometry Fuel-oxidizer mixtures Inorganic explosives Laser desorption/ionization Chemical imaging |
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