internal conversion

noun Physics.
the emission of an electron by an atom with an excited nucleus, occurring as a result of the transfer of energy from the nucleus to the electron.

Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Isomeric transition can occur through the emission of a gamma ray or through
  internal conversion.
Two common conversions are an internal conversion or an add-on.
The bremsstrahlung calculation does not distinguish between internal conversion
  electrons, beta decay, or positron emission.
The lower transitions become increasingly difficult to observe because of
  internal conversion.
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