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14-September-2008 18:38:37 - electromagnetic radiation Redirected from Absorption optics In physics, absorption of electromagnetic radiation is the process by which the energy of a photon is taken up by matter, typically the electrons of an atom. Thus, the electromagnetic energy is transformed to other form of energy, for example, to heat. The absorption of light during wave propagation is often called attenuation. Contents 1 Physical process 2 Quantitative measurements 3 Earth surface 4 See also 5 References 6 External links Physical process When a material is illuminated, photons can make the valence electrons of an atom transition to a higher electronic energy levels. The photon is destroyed in the process and the absorbed radiant energy is transformed to electric potential energy. Several things can happen then to the absorbed energy, as it may be re-emitted by the electron as radiant energy in this case the overall effect is in fact a scattering of light, dissipated to the rest of the material i.e. transformed into heat, or even the electron can be freed from the atom as in the photoelectric and Compton effects. For most substances, the amount of absorption varies with the wavelength of the light, since the energy of the incident photon must be similar to an allowed electronic transition. This leads to the appearance of colour in pigments that absorb some wavelengths but not others. For example, an object that absorbs blue, green and yellow light will appear red when viewed under white light. Quantitative measurements The absorbance of an object quantifies how much of the incident light is absorbed by it not all photons get absorbed, some are reflected or refracted instead. This may be related to other properties of the object through the Beer-Lambert law. Precise measurements of the absorbance at many wavelengths allow the identification of a substance via absorption spectroscopy, where a sample is illuminated from one side, and the intensity of the light that exits from the sample in every direction is measured. Earth surface The specific phenomena involving absorption of electromagnetic radiation at the Earth's surface have several important aspects. These phenomena include regulating the temperature of the Earth's crust, surface waters and lower atmosphere. Changes in the Earth's crust such as glaciation, deforestation, polar ice melting, will necessarily alter the quantity and wavelength selectivity of electromagnetic absorption at the Earth's surface; correspondingly, changes in climate such as global warming may accompany changes in electromagnetic absorption or its inverse, the albedo.12 Regulation of the temperature of surface waters has been analyzed with respect to the influence of electromagnetic radiation absorption, indicating the effects of total solar insolation and the local albedo.34 See also Hydroxyl ion absorption Water absorption Photosynthesis UV-visible spectroscopy References ^ Department of Physics Astronomy. Relationship of Albedo to Global Warming. Georgia State University. Retrieved on 2007-03-06. ^ Wielicki, Bruce A.; Wong, Takmeng; Loeb, Norman; Minnis, Patrick; Priestley, Kory; Kandel, Robert 6 May 2005. Changes in Earth's Albedo Measured by Satellite. Science 308 5723: 825. doi:10.1126/science.1106484. PMID 15879211. Retrieved on 2007-03-06. ^ Edinger, J.E.; Geyer, J.C 1965. Heat Exchange in the Environment. Edison Electric Institute, New York City, N.Y.. Retrieved on 2007-03-06. ^ Hogan, C. Michael; Patmore, Leda C.;Harry Seidman August 1973. Statistical Prediction of Dynamic Thermal Equilibrium Temperatures using Standard Meteorological Data Bases. EPA-660/2-73-003. U.S. Environmental Protection Agency. Retrieved on 2007-03-06. External links This physics-related article is a stub. This optics-related article is a stub. Retrieved from http://en..org/wiki/Absorption_electromagnetic_radiation Categories: Scattering, absorption and radiative transfer optics | Electromagnetic radiation | Physics stubs | Optics stubs Views Article Discussion this page History Personal tools Log in / create account Navigation Main page Contents Featured content Current events Random article Search Go Search Interaction Community portal Recent changes Contact Donate to Help Toolbox What links here Related changes Upload file Special pages Printable version Permanent link Cite this page Languages ÄŒesky Dansk Deutsch Español Français Lietuvių Nederlands 日本語 Polski Português РуÑ?Ñ?кий SlovenÄ?ina SlovenÅ¡Ä?ina Suomi УкраїнÑ?ька ä¸æ–‡ This page was last modified on 4 August 2008, at 18:07
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