Noun
the use of spectroscopy to study atomic or molecular resonances in the microwave spectrum
Source: WordNetHis research program included both experiment and theory, mainly focused on detection and analysis of free radicals using microwave spectroscopy and tunable lasers. Source: Internet
Rotations are collective motions of the atomic nuclei and typically lead to spectra in the microwave and millimeter-wave spectral regions; rotational spectroscopy and microwave spectroscopy are synonymous. Source: Internet