ultraviolet light


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Related to ultraviolet light: visible light, infrared light, Ultraviolet Rays

ultraviolet light

[¦əl·trə′vī·lət ′līt]
(electromagnetism)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

ultraviolet light

An invisible band of radiation at the upper end of the visible light spectrum. With wavelengths from 10 to 400 nm, ultraviolet (UV) starts at the end of visible light and ends at the beginning of X-rays. The primary source of ultraviolet light is the sun, and most of the UV that reaches earth is in the lower-frequency, longer-wavelength Ultraviolet "A" region (see below).

Although ultraviolet (UV) light is widely known as a disinfectant, it was also used to erase EPROM chips. After several minutes of exposure to UV light, the chip could be programmed again (see EPROM).

Ultraviolet for Chip Making
For a long time, chip lithography, which exposes the silicon to a pattern of light, has been using 193 nm far ultraviolet (FUV) as the source. However, because light cannot create a pattern smaller than its own wavelength, several photomasks are used, and complex chips require dozens of lithography steps.

After 10 nm process technology came into production, extreme ultraviolet (EUV) in the 13.5 nm range is considered the next-generation light source because its wavelength is closer to the feature size (see process technology).
                      Wavelength inUltraviolet Region   Nanometers (nm)

 Long Wave "A"   UVA    315-400
 Medium Wave "B" UVB    280-315
 Short Wave "C"  UVC    100-280

 Near            NUV    300-400
 Middle          MUV    200-300
 Far             FUV    122-200
 Vacuum          VUV    10-200
 Extreme         EUV    10-121

 Deep            DUV    Below 300


Ultraviolet in the Spectrum
The ultraviolet band comes after visible light and ends at the beginning of X-rays.
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References in periodicals archive ?
"Ultraviolet light has been used for years to disinfect water," said Baikun Li, an assistant professor of engineering at Penn State and the primary researcher on this project.
The new device, through the use of ultraviolet light, does far more to eradicate indoor air pollution than common filters and humidifiers do.
After cleaning, the air is then exposed to the ultraviolet light in the GUV module.
"Cells whose DNA has been badly damaged by ultraviolet light tend to die through programmed cell death to form sunburn cells," explains Erwin Tschachler, professor of dermatology, Vienna (Austria) Medical School and scientific director of CERIES.
For each subject, a baseline exposure to ultraviolet light was established that caused minimal skin reddening.
Earlier this year, Kac, working with scientists at France's National Institute of Agronomic Research, created a transgenic female rabbit, named Alba, that glows green under ultraviolet light. Alba glows green because the EGFG (enhanced green fluorescent gene) taken from a species of jellyfish was inserted into her genome when she was an embryo.
Wedeco AG Water Technology, the specialists in the disinfection of water with ultraviolet light, have acquired 100% of the shares of UV Systems Plc, UK.
Experts believe that exposure to ultraviolet light promotes the development of sight-threatening cataracts.
Ultraviolet light causes a host of health problems, some acute and some chronic, ranging from sunburn to cataracts, skin aging, and cancer.
In searching for better ways to photograph bite marks, it was discovered that ultraviolet light provides more detail and contrast to an injured area than standard lighting techniques.
TEHRAN (FNA)- Iranian researchers from Isfahan University of Technology produced photocatalysts that do not require ultraviolet light for water purification process and they reduce the costs.

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