Article
Article
Microwave spectroscopy
Article By:
Happer, William Department of Physics, Joseph Henry Laboratories, Princeton University, Princeton, New Jersey.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.424500
The study of the interaction of matter and electromagnetic radiation in the microwave region of the spectrum. Microwaves are loosely defined as electromagnetic radiation with wavelengths between about 1 mm and 30 cm or frequencies between 1 and 300 GHz. The wavelengths are comparable to the dimensions of experimental apparatus. Experimental techniques make use of ideas from radio-frequency spectroscopy where wavelengths greatly exceed the dimensions of the apparatus, and also techniques from optics where wavelengths are much smaller than the size of the apparatus. See also: Microwave; Spectroscopy
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