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If the population of ground state exceeds the population of the excited state a net absorption of __________ radiation takes place.(a) Infrared(b) Ultraviolet(c) Microwave(d) X-rayThe question was asked during an online interview.My question is based upon Electron Spin Resonance topic in section Electron Spin Resonance Spectrometers of Analytical Instrumentation

Answer»

Correct OPTION is (c) Microwave

Easiest explanation: If the population of ground STATE EXCEEDS the population of the excited state a net absorption of microwave radiation takes place. The signal WOULD be PROPORTIONAL to the population difference.



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