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Infrared Spectroscopy. Chapters 16-17 Chapter 7- I. IR Selection Rules. Change in dipole moment during vibration. Water Vibrations. http://www.lsbu.ac.uk/water/vibrat.html. Carbon Dioxide Vibrations. http://chemmac1.usc.edu/Bruno/java/Vibrate.html. FT-IR.

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infrared spectroscopy

Infrared Spectroscopy

Chapters 16-17

Chapter 7-I

ir selection rules
IR Selection Rules
  • Change in dipole moment during vibration
slide3

Water Vibrations

http://www.lsbu.ac.uk/water/vibrat.html

Carbon Dioxide Vibrations

http://chemmac1.usc.edu/Bruno/java/Vibrate.html

infrared sources
Infrared Sources
  • Glowbar
  • Nernst glower
  • Patented sources
detectors
Detectors
  • DLaTGS (pyroelectric)
  • MCT (semiconductor/quantum well)
  • Thermodetectors

(not used for FT-IR, response time is too slow)

    • Thermocouple
    • Bolometer
    • Thermister
ft method advantages
FT Method Advantages
  • Fellget Advantage (Multiplex Adv)
    • Collect all  at once
    • Faster, don’t need to scan  axis
  • Jaquinot Advantage (Throughput Adv)
    • No slits or optical elements to limit (attenuate) radiation
  • Connes Advantage
    • Internally calibrated w/ HeNe laser
    • Wavenumber calibration is:
      • More accurate
      • Better stability
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