01_20_spectroscopy - 1 Introduction to Spectroscopy Basic...

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Unformatted text preview: 1 Introduction to Spectroscopy Basic Principles (Ch 6) Definition: Spectroscopy is a general term for the science that deals with the interactions of various types of electromagnetic radiation with matter. 2 Electromagnetic Radiation c=2.99792x10 8 m/s in a vacuum, 0.03% less in air Wave picture of light: Transverse electric and magnetic waves that require no supporting medium for its transmission 3 Properties of EM waves c = is frequency, which is fixed The velocity of radiation propagation depends on the medium. That means the wavelength also depends on the medium. 4 EM Spectrum and some spectroscopic techniques NMR ESR FTIR XPS, EXAFS, XRD rotational spectroscopy UV-VIS, Raman 5 How does light interact with matter on a macroscopic level? Use the wave picture of light Refraction Snells Law n 1 Sin 1 = n 2 Sin 2 Reflection Angle of incidence equals angle of reflection Scattering Diffraction 6 Refraction velocity depends on the index of refraction of the medium the light is passing through refractive index quantifies how much light...
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01_20_spectroscopy - 1 Introduction to Spectroscopy Basic...

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