Chapt12_IR - 12-12-1Infrared Infrared Spectroscopy...

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Unformatted text preview: 12-12-1Infrared Infrared Spectroscopy Spectroscopy Chapter 12Chapter 1212-12-2Electromagnetic RadiationElectromagnetic RadiationElectromagnetic radiation:Electromagnetic radiation:light and other forms of radiant energyWavelength (Wavelength ():):the distance between consecutive peaks on a waveFrequency (Frequency ():):the number of full cycles of a wave that pass a given point in a secondHertz (Hz):Hertz (Hz):the unit in which radiation frequency is reported; s-1 (read per second)12-12-3Electromagnetic RadiationElectromagnetic RadiationCommon units used to express wavelengthAngstrom ()1 = 10-10 mRelationto MeterUnit1 mm = 10-3 m1 nm = 10-9 m1 m = 10-6 mNanometer (nm)Micrometer (m)Millimeter (mm)Meter (m)----type wavelengthradio waves (NMR) meters microwaves millimeters (10-3m) infrared (IR) micrometers (1 3 x 10-6m = 1000 3000 nm) visible 400 800 nm (4 8 x 10-7m) ultraviolet (UV) 100 400 nm X rays 10s of nm (10-8m) gamma rays nanometers 12-12-4How do we see stuff that is colored?How do we see stuff that is colored?White LightWavelengths we dont see because they are absorbedWe see the wavelengths that get reflected (or transmitted)demo12-12-5Molecular SpectroscopyMolecular SpectroscopyMolecular spectroscopy:Molecular spectroscopy:the study of which frequencies of electromagnetic radiation are absorbed or emitted by a particular substance and the correlation of these frequencies with details of molecular structurewe study three types of molecular spectroscopyVibrational energy levelsNuclear spin statesElectronic energy levelsInfraredRadio fequencyUltraviolet-visibleAbsorption ofElectromagneticRadiation Results in Transition BetweenRegion of theElectromagneticSpectrumNuclear magneticresonanceInfraredUltraviolet-visibleType of Spectroscopy12-12-6Infrared SpectroscopyInfrared SpectroscopyIR spectrum of 3-methyl-2-butanone12-12-7Infrared SpectroscopyInfrared SpectroscopyThe vibrational IR extends from 2.5 x 10The vibrational IR extends from 2....
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This note was uploaded on 09/19/2011 for the course CHM 262 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Chapt12_IR - 12-12-1Infrared Infrared Spectroscopy...

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