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Special Topic 2.1 Einstein coefficients of absorption and emission [Pg.30]

Bnm Einstein s coefficient of (stimulated) absorption Bmn Einstein s coefficient of stimulated emission Amn Einstein s coefficient of spontaneous emission [Pg.30]

The frequency distribution p = dp/dv of a black-body radiator is given by Planck s law (Equation 2.6) [Pg.31]

Equation 2.6 Planck distribution of a black body radiator [Pg.31]

The ratio of equilibrium populations Nn/Nm in the denominator of Equation 2.8 must obey Boltzmann s equation (Equation 2.9) [Pg.31]