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measurement of the interaction between electromagentic raidation (ie. light) with a molecule
spectroscopy can have three outcomes
energy of photon brings the molecule to some higher E or excited state
beam of light comes back with same energy started with
photon has a change in direction and or Energy
affect nuclear spin state
near and far
effects molecular vibrational states
electronic excitation...same as visible light
nuclear diffracted (scattered)
waves towards radio side have what characteristics
- Low Freq
- Low Energy
- High Wavelength
waves towards gammam side have what characteristics
- high freq
- hgih Energy
- low wavelengths
Frequency at which a bond vibrates naturally
A bond will absorb a photon that...
occurs at its natural frequency
Bonds act like...
Degrees of unsaturation (missing Hs)
- N...add 1
- O...no change
- X (cl,Br,I)...subtract 1
Degrees of unsaturation equation
saturated Hs-actual Hs/2
- CnH2n+2......10-8/2= 1 (can be a ring or pi bond)
- " '' ......10-6/2=2 (can be 2 rings or 2 pi bonds
When there is NO dipole change...
the molecule is NOT Infered (IR) active
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