# Nteraction of r adiation and m atter q uantum t heory

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NTERACTION OF R ADIATION AND M ATTER : Q UANTUM T HEORY 1 τ 2 ( 29 d d t P i f 2 ( 29 t , t 0 ( 29 f = 2 π h 2 f H int i + 1 h f H int m m H int i ϖ i m m 2 δ ϖ i f ( 29 f [ VIIIA-12 ] The nth order approximation ( for 1 τ ): We then may make the obvious extrapolation of these results and write the nth order approximation for 1 τ as 1 τ n ( 29 = 2 π h 2 f H int i + 1 h f H int m 1 m 1 H int i ϖ i m 1 m 1 f + K + 1 h n - 1 K f H int m 1 m 1 H int m 2 K m n - 1 H int i ϖ i m 1 ( 29 ϖ i m 2 ( 29 K ϖ i m n - 1 ( 29 m n - 1 m 2 m 1 2 δ ϖ i f ( 29 [ VIIIA-13 ] where m 1 , m 2 , etc. could be real imtermediate states or so called virtual intermediate states for the transitions to the state f . The conservation of energy holds only between i and f .
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