As an electron energy level has an emission level depending upon the excitation, is it possible for a system such as a Rydberg atom to have emissions in the low side of the frequency range?
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Yes it is perfectly possible. Rydberg atoms are one example, transitions within the hyperfine structure are another. However, for something as small as an atom the strength of the signal (characterized by the relevant matrix element or line strength) is very low. This means that such transitions do not happen spontaneously on reasonable timescales, but they can be observed by absorption or stimulated emission or Rabi flopping.
Andrew Steane
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