Abstract
Ultra-fast lasers generating pulses as short as one or two photon periods raise the question: “How long does the process of photon emission take”? This question has been answered by modeling photon emission by an atom in terms of classical radiation theory. This theory involves the Coulomb force and a radiation resistance force. The change of energy and angular momentum and the transition of the electron between atomic states is considered. The transition time is treated as a distinct concept from the lifetime of the excited state. In this semi-classical model the calculated transfer of the electron’s energy and angular momentum is in accord with spectroscopic data. The emitted radiation is monochromatic.
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