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Introduction: All molecules are composed of atoms connected by electromagnetic bonds. These bonds are in continuous motion, vibrationg and rotating about thie center of gravity. The atoms of each molecule vibrate at a definite frequency with respect to each other, the frequency being specific for that molecular structue and for no other. In IR analysis, infrared radiation is used to study these vibrations. The short rane ordering of nearest neighbor atoms is often most clearly shown by infrared analysis.
IR has been used to study both organic and inorganic compounds. It is more well suited for organic compounds that does not have long range ordering. Materials that are succesfully analyzed include polymers, organic compounds and hydrocarbons.
An IR spectrum for an oil sample is shown in the attached figure. In the figure, the band seen around 2700-2800 cm-1 is from C-H stretching in the hydrocarbons.
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