fluorescence
n . 荧光,发荧光,荧光性
荧光,发荧光,荧光性
fluorescence 萤光
fluorescence n 1 :
light emitted during absorption of radiation of some other (
invisible )
wavelength Fluorescence \
Flu `
o *
res "
cence \,
n . [
From {
Fluor }.] (
Chemistry ,
Optics )
A luminescence emitted by certain substances due to the absorption of radiation at one wavelength ,
and the almost instantaneous re -
emission of radiation at another ,
usually longer wavelength .
The re -
radiation stops almost as soon as the incident radiation is halted ,
thus distinguishing this phenomenon from {
phosphorescence },
in which re -
radiation of light may continue for some time after the incident radiation is halted .
Note :
The color of the radiated light typically differs from the apparent color of the material ,
as when green crystals of fluor spar afford blue reflections .
It is due not to the difference in the color of a distinct surface layer ,
but to the power which the substance has of modifying the light incident upon it ,
by first absorbing the light to achieve an excited state ,
and then radiating light to resume the ground energy level .
The light emitted by fluorescent substances is in general of longer wavelength than the incident light .
The radiation can also be induced by ionizing radiation which is not electromagnetic ,
such as alpha or beta rays ,
and cathode rays .
This property is possessed by fluorspar ,
uranium glass ,
sulphide of calcium ,
and many other substances .
It finds use in analytical instruments to detect or measure radiation ,
and in some commercial applications .
[
1913 Webster PJC ]
28 Moby Thesaurus words for "
fluorescence ":
autoluminescence ,
bioluminescence ,
cathode luminescence ,
chemicoluminescence ,
chemiluminescence ,
corposant ,
crystalloluminescence ,
double corposant ,
electroluminescence ,
fata morgana ,
fox fire ,
ignis fatuus ,
luciferase ,
luciferin ,
luminescence ,
luminophor ,
marshfire ,
noctiluscence ,
phosphor ,
phosphorescence ,
photoluminescence ,
radioluminescence ,
thermoluminescence ,
tribofluorescence ,
triboluminescence ,
tribophosphorescence ,
wisp ,
witch fire
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