given a two-level atomic system where level-2 is more energetic than the ground state level-1, what...

given a two-level atomic system where level-2 is more energetic than the ground state level-1, what is the meaning of the expression

dN₂/dt = B₁₂u_vN₁ -B₂₁u_vN₂-A₂₁N₂ when in thermal equilibrium show that A₂₁N_2
+ B₂₁u_vN₂ = B₂₁u_vN₁

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genius_generous answered 2 years ago

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given a two-level atomic system where level-2 is more energetic than the ground state level-1, what...

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