IR Spectroscopy - Introduction to Absorption Spectroscopy...

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Introduction to Absorption Spectroscopy Absorption spectroscopy is the measurement of the amount of light which is absorbed by a molecule as a function of wavelength Experimentally, a sample is irradiated by a light source Light is transmitted by the sample at different wavelengths, detected, and plotted This is a non-destructive way of analyzing an organic compound
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Electromagnetic Radiation and Organic Compounds When an organic compound absorbs light, some wavelengths are absorbed, while others are not When the energy of the light absorbed occurs in the region of 8 x 10 -5 cm to 1 x 10 -2 cm, molecular motions occur These molecular motions cause bonds to stretch, bend, and rotate This range of wavelengths occurs within the Infrared region of the electromagnetic spectrum
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Electromagnetic Spectrum
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Molecular Vibrations Covalent bonds act like a spring between two spheres The frequency of the stretching vibration depends on the mass of the atoms and the stiffness or bond strength When heavier atoms are bonded together, the
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This note was uploaded on 06/28/2011 for the course CH 236 taught by Professor Nikles during the Fall '09 term at University of Alabama at Birmingham.

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IR Spectroscopy - Introduction to Absorption Spectroscopy...

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