A physicist who coauthored the ammonia maser work with Herbert Jack Zeiger and Charles Hard Townes. An excited molecular beam transfers energy to a microwave cavity by stimulated emission. The same controlled transition can act as an oscillator, amplifier or spectroscopic reference, showing why a new radiation source could also become a precision measurement tool.[ref]
The Maser—New Type of Microwave Amplifier, Frequency Standard, and Spectrometer by James Power Gordon and others. Original maser paper: beam selection, microwave cavity and applications
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