5-1 Fundamentals of vibrational spectroscopy.pdf

Vibrational spectroscopy
(IR(IR andand RamanRaman spectroscopyspectroscopy)
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Vibrational spectroscopy
(IR(IR andand RamanRaman spectroscopyspectroscopy)
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 Fundamental principle
 Instrument
 Sample preparation
 Application
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Fundamentals of vibrational spectroscopy
Definition of vibrational spectroscopy
Vibrational spectroscopy is concerned with the
detection of transitions between energy levels in
molecules that result from stretching and bending
vibrations of the interatomic bonds.
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Vibrational frequencies
Be characteristic of particular functional
groups in molecules.
Be sensitive to
(1) molecular environment
(2) chain conformations
(3) morphology.
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Fundamentals of vibrational spectroscopy
Vibrational frequencies
 Be characteristic of particular functional
groups in molecules.
 Be sensitive to
(1) molecular environment
(2) chain conformations
(3) morphology.
It is a useful method for the structure analysis
of materials.
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State of
moleculesmolecules
At room temperature, most molecules exist in their ground
vibrational states.
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Fundamentals of vibrational spectroscopy
State of
moleculesmolecules
Excited vibrational
states
Energy
Ground vibrational states
At room temperature, most molecules exist in their ground
vibrational states.
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Fundamentals of vibrational spectroscopy
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Fundamentals of vibrational spectroscopy
Kinds of vibrationalvibrational
spectroscopyspectroscopy
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Fundamentals of vibrational spectroscopy
Kinds of vibrationalvibrational
spectroscopyspectroscopy
 Infra-red spectroscopy
(Polarized)
 Raman spectroscopy (Non-
polarized)
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InfraredInfrared spectroscopyspectroscopy
Infrared absorbance
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InfraredInfrared spec