https://doi.org/10.1351/goldbook.P04627
Particle of zero charge, zero rest mass, spin quantum number 1, energy h ν and
momentum
h νc(h is the
Planck constant
, ν the frequency of radiation and c the speed of light),
carrier
of electromagnetic force.
Sources:
Green Book, 2nd ed., p. 93 [Terms] [Book]
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2262 [Terms] [Paper]