Radiative Decay

Radiative or spontaneous decay refers to a situation, where an atom in an excited state emits a photon and decays to a lower energy state. We can use the expression for B12 in (39) to find the Einstein A-value (units s_1). In LTE, the mean intensity is the Planck function, and the ratio of the level populations n2/n1 is given by (5). Statistical equilibrium implies n2 (A21 + B21 Jv) = niBi2 Jv■ (40)

Substituting the Planck function Bv for the mean intensity Jv, where

0 0

Post a comment