01 principle of molecular spectroscopy
Post on 08-Jan-2017
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Principle of
Molecular Spectroscopy
Identification of an organic compound relied upon:elemental analysisphysical propertieschemical tests
Different spectroscopy techniques are used.study the interaction of emr with matterspectrometer spectrumultraviolet/visible (uv/vis),
infra-red (IR),nuclear magnetic resonance (nmr), mass spectrometry (MS)
Electromagnetic radiation can be described as a wave or as a particle.
As wave: λν = cAs a particle (photon): E=hν
Energy can be classified in different regions:
Probing different aspects of molecular structure:
Spectroscopic methods based on absorption of emr.
E1 ground state
E2 excited state
ΔE = hν energy
E1
E2
E3
E4
Energy
A spectrum
electronic energy level 1
Ener
gy electronic energy level 2
vibrational energy level
rotational energy levels
A molecule in space can have many sorts of energy.
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