= D. R. Johnson
{c}
<D. R. Johnson> coauthored research on <microwave spectroscopy>.<Evolution of Microwave Spectroscopy at the National Bureau of Standards (NBS) and the National Institute of Standards and Technology (NIST) by F. J. Lovas and others>[publication title and author list]{ref}
<Microwave spectroscopy> measures a system's response in the microwave <frequency> range. Molecular rotation, atomic <hyperfine structure> and transitions shifted by external fields can occur at these frequencies; the physical transition must be identified rather than inferred from the word microwave alone.
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