Infrared Spectroscopy

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As our society becomes more technologically advanced, many things advance with it. This includes criminal investigations, which can be aided by infrared spectroscopy. IR spectroscopy deals with the infrared region of the electromagnetic spectrum. This region is light with a longer wavelength and lower frequency than visible light. (Wikipedia)
IR Spectroscopy is a method to identify substances based on their absorption of infrared wavelengths. It is a study of how the molecules of substances can absorb infrared radiation and convert it into heat. (Cole) A machine called an infrared spectrometer applies infrared rays to a substance to record the number of wavelengths absorbed by said substance. (Cole) This works because of covalent bonds within substances. These bonds can be viewed as stiff springs that can be stretched and bent. (Ki) They vibrate at different amounts of energy and at a frequency that depends on the mass of the atom and strength of the bond. (Ki) the mass is larger, the frequency is lower. Also, stronger bonds yield higher frequencies. (Ki) …show more content…
Because of this, this method is valuable to the field of forensic analysis. (Cole) Almost any substance or material can be identified with the help of computer databases and machines that are able to perform IR spectroscopy. These databases have records of known infrared absorbance graphs. (Cole) The evidence gathered in a crime scene can be examined very closely with the use of this method, and can provide clues to the whereabouts of a criminal. Therefore, IR spectroscopy plays an important role in crime investigation as it can assist the police or authorities in solving crimes and locating criminals.

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