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Chapt12_IR - Infrared Infrared Spectroscopy Chapter 12...

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12- 12-1 Infrared Infrared Spectroscopy Spectroscopy Chapter 12 Chapter 12
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12- 12-2 Electromagnetic Radiation Electromagnetic Radiation Electromagnetic radiation: Electromagnetic radiation: light and other forms of radiant energy Wavelength ( Wavelength ( λ λ ): ): the distance between consecutive peaks on a wave Frequency ( Frequency ( ν ν ): ): the number of full cycles of a wave that pass a given point in a second Hertz (Hz): Hertz (Hz): the unit in which radiation frequency is reported; s -1 (read “per second”)
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12- 12-3 Electromagnetic Radiation Electromagnetic Radiation Common units used to express wavelength λ Angstrom ( Å ) Å  = 10 -10  m Relation to Meter Unit 1 mm = 10 -3  m 1 nm = 10 -9  m μ m = 10 -6  m Nanometer (nm) Micrometer ( μ m) Millimeter (mm) Meter (m) ---- type wavelength radio waves (NMR) meters microwaves millimeters (10 -3 m) infrared (IR) micrometers (1 – 3 x 10 -6 m = 1000 – 3000 nm) visible 400 – 800 nm (4 – 8 x 10 -7 m) ultraviolet (UV) 100 – 400 nm X rays 10s of nm (10 -8 m) gamma rays nanometers
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12- 12-4 How do we see stuff that is colored? How do we see stuff that is colored? White Light Wavelengths we don’t see because they are absorbed We see the wavelengths that get reflected (or transmitted) demo
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12- 12-5 Molecular Spectroscopy Molecular Spectroscopy Molecular 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 structure we study three types of molecular spectroscopy Vibrational energy levels Nuclear spin states Electronic energy levels Infrared Radio fequency Ultraviolet- visible Absorption of Electromagnetic Radiation Results in Transition Between Region of the Electromagnetic Spectrum Nuclear magnetic resonance Infrared Ultraviolet- visible Type of  Spectroscopy
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12- 12-6 Infrared Spectroscopy Infrared Spectroscopy IR spectrum of 3-methyl-2-butanone
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12- 12-7
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