Two-dimensional Fourier transform spectroscopy in the microwave-radiofrequency range

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Abstract
Two-dimensional (2D) double resonance experiments in microwave Fourier transform (MWFT) spectroscopy are extended to the radiofrequency (RF) range, yielding RF spectra with high resolution and high sensitivity. A theoretical description of the experiments is given, which includes a consideration of the effects from collisional relaxation and from Doppler shift of the resonance frequencies. The method was applied to simultaneously record l-type doublet (RF) and rotational (MW) spectra of carbonyl sulphide and cyanoacetylene, respectively. Possible future applications of the 2D-(RF)MWFT spectroscopy are also discussed.