Elementary biophysics: selected topics elementarybiophy00epst Year: 1963 INTRODUCTION 53 Electron is in nor- mal or ground state at time / = 0 sec Electron is in an excited state after absorbing photon of energy E^ — Eq after 1= 10~8 sec (a) Electron has lost some excitation en- ergy—is in lowest allowed excited state 10-n-10-8 sec after reaching Es

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