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Chemistry; Big Ideas

The Infrared Spectroscopy

Mirusha Ravi

on 23 October 2012

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Transcript of Chemistry; Big Ideas

In Criminal Investigations The Infrared Spectroscopy How An IR Spectroscopy Works Society's Benefits The vibrations are displayed as wave numbers Infrared Spectroscopy WHAT IS AN
INFRARED SPECTROSCOPY? Disadvantages Are capable of identifying covalent compounds/substances
The infrared portion of the apparatus is used to examine how each sample is made (the composition) Determines the chemical function in the sample

Accepts a samples from different states of matter (gases, liquids and solids) Bonds of the chemical substance vibrate at the lowest amount of energy at room temperature. If radiation is applied, the bond absorbs energy and vibrates at greater amplitude Main Goal: The Chemistry Component of: Reveal the structures of covalently bonded chemical compounds e.g. organic compounds The frequency of the infrared vary depending on the different chemical bonds that are absorbed by the IR.
The vibrations of the frequencies are shown depending on the type of bond. Identifies the characteristics the molecule has Despite the fact that it does not give the exact structure of the molecule, it identifies the functional group/segment the substance is in IR SPECTROSCOPY'S FUNCTIONS When a sample is being looked at with an IR spectroscopy:
- there is a focused beam of light (on the sample) which uses reflective optics
-Light vary depending on the composition of the sample -> different wavelengths
-The sample composition is identified by observing the amount of light it absorbs IR Spectroscopy and Criminal Investigations Beneficial to the field of Forensics Almost any substance or material can be identified with the help of the IR spectroscopy Helps authorities solve crimes and potentially locate the criminals e.g. A specific model of the car can be identified by having a paint chip of the car analyzed by the IR spectroscopy OR a bullet shell at a crime scene can be used to identify the weapon it was shot out of and where it was manufactured Preparing the sample to view under the IR spectroscopy is time consuming
Information about sample is not insightful (no details) in comparison to the NMR (Nuclear Magnetic Resonance)
Requires sensitive instruments that are very expensive - Causes no damages since infrared is harmless
e.g. X- Rays vs. IR spectroscopy with precautions
- Samples viewed by IR spectroscopy require no preparation
- Fast in comparison to other machines The substance under the IR spectroscopy can be identified according to the number of wavelengths produced Thank You for Listening
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