Consider a non-degenerate three level system with E1 < E2 < E3. An intensive incident light...

Consider a non-degenerate three level system with E1 < E2 < E3. An intensive incident light of energy hν13 = E3 − E1 is turned on for very short period of time and then turned off. (a) Write down the rate equation for N3(t). (b) Solve this equation. What is the observed radiative lifetime of the excited state corresponding to E = E3?

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