principle of molecular spectrosocpy

1. Principle of
Molecular Spectroscopy

2. Identification of an organic compound relied upon:
 elemental analysis
 physical properties
 chemical tests

3. Different spectroscopy techniques are used.
 study the interaction of emr with matter
 spectrometer  spectrum
 ultraviolet/visible (uv/vis),
infra-red (IR),
nuclear magnetic resonance (nmr),
mass spectrometry (MS)

4. Electromagnetic radiation can be described as a
wave or as a particle.
 As wave: λν = c
 As a particle (photon): E=hν

5. Energy can be classified in different regions:

6. Probing different aspects of molecular structure:

7. Spectroscopic methods based on absorption of emr.
E1 ground state
E2 excited state
ΔE = hν energy

8. E1
E2
E3
E4
Energy
A spectrum

9. electronic energy level 1
Energy
electronic energy level 2
vibrational energy level
rotational energy levels
A molecule in space can have many sorts of energy.