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departmentofmaterials scienceandengineering
departmentofmaterials scienceandengineering

... energies are easily transferred by fast neutrons (T~1 MeV) from a nuclear reactor or by incident ions (T~50 keV) during ion implantation of a solid. Much lighter electrons (of mass me << MNa or MCl) must be accelerated to kinetic energies T~250 keV (at that point traveling with about 80% the speed o ...
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Ultraviolet–visible spectroscopy



Ultraviolet–visible spectroscopy or ultraviolet-visible spectrophotometry (UV-Vis or UV/Vis) refers to absorption spectroscopy or reflectance spectroscopy in the ultraviolet-visible spectral region. This means it uses light in the visible and adjacent (near-UV and near-infrared [NIR]) ranges. The absorption or reflectance in the visible range directly affects the perceived color of the chemicals involved. In this region of the electromagnetic spectrum, molecules undergo electronic transitions. This technique is complementary to fluorescence spectroscopy, in that fluorescence deals with transitions from the excited state to the ground state, while absorption measures transitions from the ground state to the excited state.
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