(from the article `spectroscopy`) For diatomic molecules the rotational constants for all but the very lightest ones lie in the range of 1–200 gigahertz (GHz). The frequency of a ... ...its atmosphere is composed primarily of carbon dioxide. Subsequent infrared observations revealed further details about the composition of both ......
[n] - the use of spectroscopy to study atomic or molecular resonances in the microwave spectrum
noun the use of spectroscopy to study atomic or molecular resonances in the microwave spectrum