Fourier transform infrared (FT-IR) spectroscopy is a technique already being used during forensic investigations for analysis of physical evidence (such as controlled substances, fibers, and paint) (1).
How is spectroscopy used in forensics?
Mass spectroscopy, also called mass spectrometry, is a scientific method that analyzes a sample of material to determine its molecular makeup. … Mass spectrometry has become a valuable tool in forensic science, where it can provide clues from the barest traces left by a suspect.
What is infrared spectroscopy used for in forensic science?
Because much of the evidence that is left at a crime scene consists of organic compounds, infrared spectroscopy is useful in forensic investigations. … Infrared spectroscopy can be used to identify forged or altered documents by shining a beam of infrared light on the document’s ink.
What are the uses of FTIR in the forensic laboratory?
Lightweight, handheld FTIR analysis devises are designed to give quick, precise, on-the-spot characterization and identification of forensic samples. Unknown materials are identified by searching the spectrum against a database of reference spectra. FTIR analysis provides exact measurements without harming the sample.
Why would a forensic investigator use infrared spectroscopy on a fiber sample?
By using infrared spectroscopy, more information about the sample can be obtained. For example, if a fiber has been degraded by burial or by time, the surface features needed to identify it may no longer be present.
What are the applications of spectroscopy?
Spectroscopy is used as a tool for studying the structures of atoms and molecules. The large number of wavelengths emitted by these systems makes it possible to investigate their structures in detail, including the electron configurations of ground and various excited states.
Is spectroscopy used in forensic science?
Spectroscopy for forensic toxicology
Raman spectroscopy serves the field of forensic toxicology as an analytical tool to detect and quantify drugs in biological specimens.
What is the basic principle of infrared spectroscopy?
IR spectroscopy detects the absorption of light by a compound, in the IR region of the electromagnetic spectrum. To absorb light a molecule must have a bond within its structure that can exhibit what is referred to as a ‘dipole moment’ which means electrons within a bond are not shared equally.
How is UV light used in forensic testing?
Ultraviolet (UV) light allows investigators and forensic researchers to examine clues and recover evidence that could not have been previously detected. UV light provides more detail and contrast to an injured area, including bite marks, than standard lighting techniques.
What is infrared spectroscopy and how does it work?
Infrared spectroscopy exploits the fact that molecules absorb specific frequencies that are characteristic of their structure. These absorptions are resonant frequencies, i.e. the frequency of the absorbed radiation matches the frequency of the bond or group that vibrates.
Why is a forensic lamp powerful?
Most importantly, it helps in the detection of latent finger prints that are important evidence in any crime scenes. The forensic lamps are made up of powerful light sources that can divide the light according to different groups of wavelengths that help in the easy visualization of the evidence.
Is FTIR confirmatory?
It can provide confirmatory identification of the fluid type, can estimate the stain’s age, discriminate species, and can be used on samples found on various substrates and exposed to various environmental conditions.
What are the limitations of IR spectroscopy?
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. -Non-adherence with Beer’s law of complexity spectra is a frequent occurrence.
How do forensic scientists use microscopes?
The microscope is used by forensic scientists to locate, isolate, identify, and compare samples. … Optical properties such as refractive index, birefringence, pleochroism, and interference figures are combined with morphological properties to compare and identify forensic samples.
How can spectrophotometry be used to solve crimes?
Spectrophotometry is a process commonly used in the field of forensic science to trace evidence. This process uses infrared radiation and more commonly visible lights to ascertain light transmission, absorption, and reflective properties of any form of tiny materials.
What is one way law enforcement uses IR spectroscopy?
Using Infrared Spectroscopy to Identify Legal Highs and Scheduled Narcotics. Legal highs are drugs that consist of a complex mixture of different chemical ‘ingredients’, precisely manufactured to ensure that they remain off the list of controlled substances.