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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


Water Vibrations

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

Carbon Dioxide Vibrations

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



Retardation – difference in path length of two beams



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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