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Lecture

IR workshop.docx

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Department
Chemistry
Course
CHEM261
Professor
berzawski
Semester
Fall

Description
IR workshop - Infrared spectroscopy involves studying the interaction of infrared radiation on atoms or molecules. - When a sample of an organic compound is subjected to infrared radiation the compounds absorbs some of this energy. - As energy at certain wavelengths is absorbed a detector can be used to record the decrease in intensity of the radiation as it passes through the sample. - An absorption spectrum is produced showing the percentage transmittance versus the wavenumber. - A 95% transmittance means that most radiation at a particular frequency passed straight through the sample. - A 5% transmittance means that nearly all the radiation at a particular frequency was absorbed by the sample. - The amount of absorption or transmittance of infrared radiation provides information about the bonds in the sample. - If a particular frequency is being absorbed as it passes through a sample then it must mean that its energy is being transferred to the compound. - The energies specific to infrared radiation correspond to the energies involved in bond vibrations such as bond stretching or bond bending. - When the frequency of
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