Infrared-microwave double resonance: signal dependence on microwave radiation strength

Abstract

The influence of MW radiation on the magnitude of double resonance signals is studied in the case of steady-state 3-level IR-MW double resonance, using IR or MW radiation as probe field. The measurements reveal a strong signal dependence on the microwave power level. Changes in the absorption factor of more than 50% occur. They can be explained only if higher order effects are taken into account: the Takami theory is in good agreement with the measurements for both cases of probe field.