Dissertation/Thesis Abstract

Discrimination of forensic trace evidence using laser induced breakdown spectroscopy
by Bridge, Candice Mae, Ph.D., University of Central Florida, 2007, 244; 3377849
Abstract (Summary)

Elemental analysis in forensic laboratories can be tedious and many trace evidence items are not analyzed to determine their elemental composition. Presently, scanning electron microscopy-energy dispersive x-ray spectroscopy (SEM-EDS) is the primary analytical tool for determining the elemental composition of trace evidence items. However, due to the time it takes to obtain the required vacuum and the limited number of samples that can be analyzed at any one time, SEM-EDS can be impractical for a high volume of evidence items. An alternative instrument that can be used for this type of analysis is laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). While LA-ICP-MS is a very precise and quantitative analytical method that determines elemental composition based on isotopic mass measurements; however, the instrumentation is relatively expensive and therefore is budgetarily prohibitive for many forensic laboratories. It is the purpose of this research to evaluate an inexpensive instrument that can potentially provide rapid elemental analysis for many forensic laboratories. Laser induced breakdown spectroscopy (LIBS) is an analytical method that meets these requirements and offers information about the elemental composition based on ionic, atomic and diatomic molecular emissions.

Indexing (document details)
School: University of Central Florida
School Location: United States -- Florida
Source: DAI-B 70/10, Dissertation Abstracts International
Subjects: Analytical chemistry, Molecular physics, Plasma physics
Keywords: Forensic trace evidence, Laser induced breakdown spectroscopy, Molecular emissions
Publication Number: 3377849
ISBN: 978-1-109-43105-6
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