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научный термин
ультрафиолетовый вакуумный
['fɑ:(r)ʌltrə'vaiəlit]
существительное
физика
дальняя ультрафиолетовая область (спектра)
дальняя ультрафиолетовая область (спектра)
Extreme ultraviolet radiation (EUV or XUV) or high-energy ultraviolet radiation is electromagnetic radiation in the part of the electromagnetic spectrum spanning wavelengths shorter that the hydrogen Lyman-alpha line from 121 nm down to the X-Ray band of 10 nm, and therefore (by the Planck–Einstein equation) having photons with energies from 10.26 eV up to 124.24 eV. EUV is naturally generated by the solar corona and artificially by plasma, high harmonic generation sources and synchrotron light sources. Since UVC extends to 100 nm, there is some overlap in the terms.
The main uses of extreme ultraviolet radiation are photoelectron spectroscopy, solar imaging, and lithography. In air, EUV is the most highly absorbed component of the electromagnetic spectrum, requiring high vacuum for transmission.