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eRev. 1.08/15/2023
Wavelength: Electromagnetic energy is transmitted in the form of a sinusoidal wave; the wavelength is the physical distance
covered by one cycle of this wave. It is defined as the distance from one crest of an electromagnetic wave to the same position on
the subsequent wave.
Window: A transparent material with plane parallel surfaces used to admit light into an optical system and exclude contaminants
such as dirt and moisture. Windows are used within an instrument and for holding samples. For UV work, the window material is
generally low-OH quartz (SiO2), and, for visible spectroscopy, some polymers are used, such as polystyrene (PS), or
polymethylmethacrylate (PMMA).
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