Pulsed Microwave Microwave Double Resonance Spectroscopy with Fourier Transform Technique

Recently we showed that microwave (MW) double resonance experiments can be performed with microwave Fourier transform (MWFT) techniques [1]. In our first experiments we used a continuous microwave (CW) pump radiation. One observation is that the transient emission signal in the presence of a CW p u m p radiation decays faster. This results in an additional line broadening, as can be seen in Fig. 3 of [1], In this paper we present an extension to pulsed MW p u m p radiation. Switching off the pump radiation during the period of polarization of the molecular ensemble and the measuring time of the transient emission signal the additional line broadening can be avoided. So the high resolution of the M W F T spectroscopy can be maintained.