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DeCS

Descriptor English:

Photons

Descriptor Spanish:

fotones

Descriptor Portuguese:

Fótons

Tree Number:

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:

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

Similar:

DeCS