"The light-quantum has the peculiarity that it apparently ceases to exist when it is in one of its stationary states, namely, the zero state, in which its momentum and therefore also its energy, are zero. When a light-quantum is absorbed it can be considered to jump into this zero state, and when one is emitted it can be considered to jump from the zero state to one in which it is physically in evidence, so that it appears to have been created. Since there is no limit to the number of light-quanta that may be created in this way, we must suppose that there are an infinite number of light quanta in the zero state..."
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|title=The Quantum Theory of the Emission and Absorption of Radiation|journal=Proc. Roy. Soc.|date=1927|volume=A114|issue=767|pages=243–265|doi=10.1098/rspa.1927.0039|url=http://www.imotiro.org/repositorio/howto/artigoshistoricosordemcronologica/1927%20-%20DIRAC%201927%20First%20steps%20in%20quantum%20field%20theory%20Invention%20of%20the%20second%20quantization%20method.pdf|accessdate=17 October 2016}}
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