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PHOTONS
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DeCS
Descriptor
English
:
Photons
Descriptor
Spanish
:
fotones
Descriptor
Portuguese
:
Fótons
Tree Number:
G01.249.705
G01.358.500.505.650.782
G01.590.540.782
G01.750.250.650.782
G01.750.770.578.782
Definition
English
:
Discrete concentrations of
energy
, apparently massless
elementary particles
, that move at the speed of light. They are the unit or quantum of
electromagnetic radiation
.
Photons
are emitted when
electrons
move from one
energy
state to another. (From Hawley's Condensed Chemical
Dictionary
, 11th ed)
Indexing Annotation
English
:
elementary particles
; IM
History Note
English
:
94; was see RADIATION 1985-1993
Allowable Qualifiers
English
:
AE
adverse effects
CL
classification
HI
history
TU
therapeutic use
Record Number:
31183
Unique Identifier:
D017785
Occurrence in VHL
:
Similar:
DeCS