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Infrared Spectroscopy

This resource delves into infrared spectroscopy, covering fundamental concepts like molecular vibrations, vibration frequency, and the principles behind spectrometer operation. It highlights single and dual-beam setups, including applications in gas, liquid, and solid samples. The use of sample cells, peak identification in spectra, and techniques such as attenuated total reflection and Fourier transform methods are discussed. The introduction of Raman spectroscopy and laser light illumination further enhances the understanding of scattered light spectra. Ideal for students and professionals in chemical engineering.

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Infrared Spectroscopy

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  1. Infrared Spectroscopy Terry A. Ring Chemical Engineering University of Utah

  2. Molecular Vibrations • Mass on a spring • Vibration Frequency • ν=c/λ • Wave number =1/ λ

  3. Spectrometer • Single Beam • Dual Beam • with Reference • Gas, Liquid & Solid • Sample Cells • Powder mixed with KCl to make pellet • Reflection off surface of Sample • Attenuated Total Reflection Sample Sample

  4. Spectrum • Peak Identification

  5. Spectrum • Peak Identification • Valence Vibrations • Bending Vibrations

  6. Peak Identification

  7. Fourier Transform IR • Mixing light from • Fixed mirror • Moving mirror

  8. Raman Spectroscopy • Laser Light Illumination • Scattered Light Spectra Observed

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