= Herbert Jack Zeiger
{c}
{tag=Physicist}
= Herbert J. Zeiger
{c}
{synonym}
= Herbert Zeiger
{c}
{synonym}
= H. J. Zeiger
{c}
{synonym}
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.<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]{ref}
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