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Blood will tell

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Hank Hogan, [email protected]

The job of criminal investigators may have gotten a bit easier, thanks to a method based on Raman spectroscopy that quickly determines the species of origin of a dried blood sample. With this knowledge, police detectives can ensure that the right samples are collected at a crime scene. In developing the method, associate chemistry professor Igor K. Lednev and graduate student Kelly Virkler of the University at Albany, State University of New York, had to overcome a basic problem. For simple compounds, the standard approach is to compare collected Raman data against a library of known...Read full article

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    Published: November 2009
    Glossary
    near-infrared
    The shortest wavelengths of the infrared region, nominally 0.75 to 3 µm.
    raman spectroscopy
    Raman spectroscopy is a technique used in analytical chemistry and physics to study vibrational, rotational, and other low-frequency modes in a system. Named after the Indian physicist Sir C.V. Raman who discovered the phenomenon in 1928, Raman spectroscopy provides information about molecular vibrations by measuring the inelastic scattering of monochromatic light. Here is a breakdown of the process: Incident light: A monochromatic (single wavelength) light, usually from a laser, is...
    spectral signature
    A spectral signature, in the context of remote sensing and spectroscopy, refers to the unique pattern or characteristic spectral response of a material or object across different wavelengths of the electromagnetic spectrum. Each material interacts with electromagnetic radiation in a specific way, leading to distinctive absorption and reflection patterns at different wavelengths. Analyzing these patterns forms the basis of spectral signature identification. Key points about spectral...
    Basic ScienceBiophotonicsBloodconfocal Raman microscopecriminal investigationdefenseHank HoganIgor K. LednevImagingKelly VirklerMicroscopyNational Institute of Justicenear-infraredNews & FeaturespoliceRaman spectroscopyRenishawspeciesspectral signatureState University of New YorkSUNYUniversity at AlbanyLasers

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