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Physics
Classical Physics
Optics
How does ultraviolet photography (fluorescence) work?
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[QUOTE="Cutter Ketch, post: 6067276, member: 515910"] Some materials can and do fluoresce in the infrared. For example fluorescence is the principle mechanism of essentially all optically pumped lasers, and the most common lasers are pumped and emit in the near IR. However fluorescence tends to happen at higher energies (shorter wavelengths). This is because the absorption and emission of light is governed by transitions in energy states of electrons in the atom, molecule, or material. The energy spacing between electronic states is usually large enough to absorb and emit NIR, visible, and UV light. Even higher energies are available because the electrons can transition further than just adjacent states. However lower energies are tough because the electrons can’t transition less than one state. Low energy longer wavelength transitions require lower energy transitions and so involve collective motions like vibrations or rotations of a molecule. Still, even then there are plenty of mechanisms that allow for absorption of one wavelength and reemmision at a lower wavelength. [/QUOTE]
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Physics
Classical Physics
Optics
How does ultraviolet photography (fluorescence) work?
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