An experimental physicist who coauthored the ammonia maser. Selecting molecules in an excited state and passing them through a resonant microwave cavity allowed stimulated emission to sustain a coherent signal. The device made population preparation and resonator feedback into an oscillator, connecting molecular spectroscopy to frequency generation and amplification.[ref]
The Maser—New Type of Microwave Amplifier, Frequency Standard, and Spectrometer by James Power Gordon and others. Abstract and molecular state selection, cavity and oscillation mechanism
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