Chem3108Ch7Raman_PreLab

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Texas Tech University *

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3108

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Chemistry

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Apr 3, 2024

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pdf

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1

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Chem 3108 Raman Spectroscopy: Vibrational Spectrum of CCl 4 and Applications Due at the start of lab. (10 pts) To receive full credit for the problems, you must show all your work. Use additional sheets if necessary. 1. (2 pts) In Raman spectroscopy, transitions between vibrational energy levels are caused by: whereas in infrared spectroscopy, transitions between vibrational energy levels are caused by: 2. (1 pt) What is the intensity of the Raman shifted light relative to that of the incident light? 3. (1 pt) How many possible vibrational modes are in CCl 4 ? 4. (2 pts) The wavenumber of a Raman Stokes line obtained by the vibrational excitation of water with light from a HeNe laser is 14207 cm -1 . What is the wavenumber of the vibrational mode associated with this Stokes line? 5. (1 pt) A linear triatomic molecule has vibrational modes at 1388, 2349, and 667 cm -1 . Which mode corresponds to bending mode? 6. (2 pts) Briefly explain how information about the polarization of a Raman line is obtained with the Advantage 200A Raman spectrometer. 7. (1 pt) There are many applications of Raman spectroscopy. How is Raman spectroscopy being used in airport security? (Use the Internet to answer this question.)
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