Preferred Label : excimer lamp;
IUPAC acronym : UV;
IUPAC definition : Non-coherent source of i ultraviolet /i radiation capable of producing quasi-monochromatic
radiation from the near UV (λ 354 nm) to the vacuum UV (λ 126 nm). The operation
of the excimer lamps relies on the radiative decomposition of i excimers /i or
i exciplexes /i created by various types of discharges.;
Scope note : phosphors are used to transform the uv radiation into visible radiation. this is the
basis of mercury-free fluorescent lamps and of flat plasma-display panels with a large
screen.; using noble gas, halogen, or noble gas / halogen mixtures with fill pressure
30 kpa , the radiative decomposition of the excimer or the exciplex produces
nearly monochromatic radiation. some of the commercially available wavelengths for
the particular excimers or exciplexes are 126nmwith ar2, 146nm with kr2, 172nmwith
xe2, 222nm with krcl, and 308nmwith xecl, obtained with efficiencies of 5 - 15
%. pulsed xe-excimer (xe2) lamps may have up to 40 % efficiency. good efficiencies
are also obtained with xebr at 291nm and with xei at 253nm. other wavelengths produced
with much less efficiency are 207nm (krbr), 253nm(xei), 259nm (cl2), and 341nm
(i2) (see table 1). table 1: peak wavelengths (nm) obtained in dielectric-barrier
discharges with mixtures of noble gas (ng) and halogen (x2). wavelengths of commercially
available lamps are shown in boldface type. the molecular species indicated are excimers
or exciplexes. x2 ne ar kr xe
ng2 126 146 172 f 157 108 193
249 354 cl 259 175 222 308
br 291 165 207 283 i 341
190 253;
Origin ID : ET07372;
Automatic exact mappings (from CISMeF team)
- See also
Non-coherent source of i ultraviolet /i radiation capable of producing quasi-monochromatic
radiation from the near UV (λ 354 nm) to the vacuum UV (λ 126 nm). The operation
of the excimer lamps relies on the radiative decomposition of i excimers /i or
i exciplexes /i created by various types of discharges.
