Why would a forensic investigator use infrared spectroscopy on a fiber sample?

What is infrared spectroscopy forensics?

Infrared (IR) spectroscopy is a technique based on the vibrations within a molecule. … IR spectroscopy has been adopted as a tool for the forensic analysis of a range of evidence types. Protocols for the sampling and spectral analysis have been developed for the various categories.

Why is FTIR used in forensic science?

FTIR is a valuable forensic technique because of its detection sensitivity and versatility. Chemicals from a variety of sample types including blood , paints, polymer coatings, drugs and both organic and inorganic contaminants can be identified.

What is infrared spectroscopy used for?

IR spectroscopic analysis is used to determine the various chemical functional groups present in the sample. Different functional groups absorb characteristic frequencies of IR radiation. IR spectroscopy is simply absorption measurement of different IR frequencies of a sample positioned in the path of an IR beam [79].

What techniques are used for fiber analysis?

Fiber/Fibre Analysis Techniques

  • Optical Light Microscopy.
  • Atomic Force Microscopy.
  • Scanning Electron Microscopy (SEM)
  • Transmission Electron Microscopy (TEM)

Is IR spectroscopy confirmatory?

Infrared (IR) spectroscopy is a confirmatory test for a controlled substance when the controlled substance is not mixed with other substances, or is mixed with other substances in a ratio such that the IR spectrum of the mixture is not significantly different from that of a known reference standard.

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What are the limitations of IR spectroscopy?

IR Spectroscopy has many advantages and uses, but they also have limitations. The limitations of IR spectroscopy are: -IR spectroscopy fails to give details on the relative positions of a molecule’s functional groups. -It is impossible to determine a substance’s molecular weight using IR spectroscopy.

Why is chromatography used in forensic science?

Background: Chromatography is a method for analyzing mixtures by separating them into the chemicals from which they are made. … Forensic scientists are able to use ink chromatography to solve crimes by matching documents or stains found at a crime scene to the marker or pen that belongs to a suspect.

What is mass spectroscopy used for in forensics?

Mass spectrometry – an analytical technique that measures the mass-to-charge ratio of ions and, in forensic science, one of the best ways for toxicologists to identify and analyse substances. … As a result, its widest application is in the analysis of drugs (including drug metabolites and drug paraphernalia).

How does spectroscopy detect the composition of these residues?

Mass spectroscopy, also called mass spectrometry, is a scientific method that analyzes a sample of material to determine its molecular makeup. By ionizing a sample, a scientist can cause it to separate into its individual ions. This allows him to analyze and categorize those ions to determine the sample’s composition.