INFRARED SPECTROSCOPY Visible Ultraviolet Infrared M
INFRARED SPECTROSCOPY
Highest energy Lowest energy Wavelength (nm) 10Γ2 10p 102 104 105 108 1010 102 Gamma iUlra- ray X-ray Iviolet Infrared Microwave Radio frequency 1020 108 1016 1014 102 1010 10 105 104 Frequency(s-1) 400 500 600 700 750nm Visible region
Electromagnetic Spectrum Wavelength (A) Energy Molecular effects higher frequency cm kcal/mol shorter wavelength 10-9 gamma rays 106 10-7 X rays 104 ionization vacuum UV 102 10-5 near UV electronic transitions 10-4 visible 10 infrared 10-3 1 molecular vibrations (IR) 10-2 10-1 microwave 10-4 rotational motion 102 lower frequency radio 10-6 104 nuclear spin transitions longer wavelength
Electromagnetic Spectrum
Bond Stretching spring force spring force ○Y000○ equilibrium stretched compressed bond length ○y0000○
Bond Stretching
High Frequency Stretching Low Frequency Bending symmetric stretching antisymmetric stretching bending(scissoring)
High Frequency Stretching Low Frequency Bending