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The long end of the EUV spectrum is set by a prominent He spectral line at 30.4 nm.
EUV is strongly absorbed by most known materials, but it is possible to synthesize multilayer optics that reflect up to about 50 percent of EUV radiation at normal incidence.
Consequently, the chemical and biological effects of UV are greater than simple heating effects, and many practical applications of UV radiation derive from its interactions with organic molecules.
Ultraviolet can be detected by suitable photodiodes and photocathodes, which can be tailored to be sensitive to different parts of the UV spectrum.Significant examples include 193 nm photolithography equipment (for semiconductor manufacturing) and circular dichroism spectrometers.Technology for VUV instrumentation was largely driven by solar astronomy for many decades.It is also produced by electric arcs and specialized lights, such as mercury-vapor lamps, tanning lamps, and black lights.Although long-wavelength ultraviolet is not considered an ionizing radiation because its photons lack the energy to ionize atoms, it can cause chemical reactions and causes many substances to glow or fluoresce.