Chapter 2 Introduction to Optical Methods The Nature of Radiant Energy Spectral Regions Interaction of Radiation with Atom and Molecule Practical Sources of Radiation Spectrograph and Monochromator The Nature of Radiant Energy The Duality of Light: Wave properties Refraction Diffraction Reflection Scattering V frequency, C velocity of light , wavelength, v wave number __ () - Where h is Planck’s constant, h=×10-34 2. Particular proper ( the Energy of a photon) () Spectral Regions Interaction of Radiation with Atoms Emission Atom (high excited state) → Atom (lower excited state) + h Absorption Atom (ground state) + h→ Atom (high excited state) Fluorescence Atom (ground state) + h→ Atom (high excited state) Atom (lower excited state) + hF Interaction of Radiation with Molecules E(molecule) = Ee + Ev + Er E = E2 — E1 = hv Absorption M + hv →M* Fluorescence M + hv →M* →M + hv`
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