Einstein's absorption coefficient

Einstein's absorption coefficient

[′īn‚stīnz əb′sȯrp·shən ‚kō·i‚fish·ənt]
(atomic physics)
The proportionality constant governing the absorption of electromagnetic radiation by atoms, equal to the number of quanta absorbed per second divided by the product of the energy of radiation per unit volume per unit wave number and the number of atoms in the ground state.
Full browser ?