Atomic Lithium Of Concentration N 3.6

Atomic lithium of concentration n = 3.6.1016 cm –3 is at a temperature T = 1500 K. In this case the power emitted at the resonant line’s wavelength λ = 671 nm (2P → 2S) per unit volume of gas is equal to P = 0.30 W/cm a. Find the mean lifetime of Li atoms in the resonance excitation state.

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