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UV-VIS Spectrophotometer
HP 8542 Diode-Array UV-Vis Spectrophotometer (1994) Beckman DU 65 UV-VIS with Temperature Control (1990) Varian DMS 90 UV/VIS Spectrometer (1978) Ultraviolet spectroscopy is applicable solely to conjugated systems. This is because most organic compounds produce no effect whenever the relatively high-energy radiation that constitutes the ultraviolet (200–400 nm) and visible (400–700 nm) portion of the electromagnetic spectrum are presented. Whenever ultraviolet radiation is used, the energy absorbed by a molecule corresponds to the amount necessary to excite electrons from one molecular orbital to another. Typical organic compounds, which mostly contains bonds, require much higher wavelengths to become excited than what the range of UV will provide. Only those conjugated systems with a number of bonds are capable of being promoted to higher energy levels by ultraviolet and visible light. A sample is placed into a cuvette and the spectrum is recorded by irradiating the sample with ultraviolet light of continuously changing wavelength. When the wavelength of light corresponds to the energy level required to excite an electron to a higher energy level, energy is absorbed. This absorption is detected and plotted on the vertical axis as the absorption while the wavelength of the absorbed light is plotted horizontally. Links: http://www.shu.ac.uk/schools/sci/chem/tutorials/molspec/uvvisab1.htm http://www.sci.sdsu.edu/TFrey/Bio750/UV-VisSpectroscopy.html Contact Information Dr. William D. Price These tools and others are utilized to aid in understanding nanomachines, nanotools and related elements through research in nanotechnology. Nanochemistry is an important component of our success and is being investigated by Dr. Michael L. Norton. Contact Norton Laboratories with your interests. For more information, send your questions to:
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