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D. R. Johnson coauthored research on microwave spectroscopy.^[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.

By F. J. Lovas, D. R. Lide, Jr., R. D. Suenram, D. R. Johnson.

Publisher: National Institute of Standards and Technology.

Published in Journal of Research of the National Institute of Standards and Technology 117, 268–296.

Online text: tsapps.nist.gov/publication/get_pdf.cfm?pub_id=911001

PDF text accessible; screenshot request returned cache miss. Does not establish detailed pulse/readout electronics for the 2024 commercial instrument. No measured frequencies copied.