Infrared and Raman Spectroscopy in Forensic Science by John M. Chalmers, Howell G. M. Edwards, Michael D.

By John M. Chalmers, Howell G. M. Edwards, Michael D. Hargreaves

This booklet will supply a survey of the most important parts during which details derived from vibrational spectroscopy investigations and experiences have contributed to the good thing about forensic technological know-how, both in a complementary or a special approach. this is often highlighted via examples taken from actual case reports and analyses of forensic relevance, which supply a spotlight for present and destiny functions and advancements.

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Reprinted with permission from Reference [82], Ó 2008 The Optical Society of America. 05 THz of (a) the PETN pellet and (b) a pure lactose monohydrate pellet. Reprinted with permission from Reference [85], Ó 2009 The Optical Society of America. (c) and (d) show the THz spectra of PETN and lactose monohydrate respectively; the vertical lines indicate the two frequencies used for the difference frequency image. 2 The “Tennis player” (L. ), reproduced with permission from the private collector. 6 TXRF results of the 123 blue samples of the acanthus borders of “Expositio problematum Aristotelis” (Ghent University Library, Hs.

Section I Introduction 1 Introduction and Scope John M. M. Edwards2 and Michael D. 1 Historical Prologue Forensic science can be defined as the application of scientific principles to the public domain in courts of law, which were held by the Romans in the public forum. Although evidence of the unlawful killing of a human being was presented in public fora from quite early times, such as the post mortem examination of the body of Julius Caesar after his assassination, which revealed 23 stab wounds but only one of which was judged to be fatal, and poisoning in particular, where the appearance of organ degradation gave rise to the conclusions that toxic materials had been ingested, these pronouncements were in the realm of the prototype medical examiners and pathologists and not chemical analysts [1].

11 Example of melamine detection in wheat gluten by microscopic wide-field Raman imaging. (a) Brightfield reflection optical image. (b) Raman image frame at 670 cmÀ1. (c) Bright-field/Raman fusion image where false colouring has been applied for melamine (green) and wheat gluten (blue). (d) Image spectrometer-derived spectra of selected regions imaged. , Pittsburgh, PA, USA. 16 Comparison of mid-infrared spectra of silicone oil prepared as: red spectrum, transmission measurement from a thin smear on a ZnSe window; blue spectrum, a smear on an ATR (ZnSe multiple internal reflection; MIR) element.

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