New Method for the Observation of Hyperfine Structure of NH3 in a ``Maser'' Oscillator

The Maser—New Type of Microwave Amplifier, Frequency Standard, and Spectrometer

1955 • 635 citations

Hyperfine Structure in the Inversion Spectrum of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">N</mml:mi></mml:mrow><mml:mrow><mml:mn>14</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:…

1955 • 98 citations

Atomic Clocks and Frequency Standards on an Ammonia Line. III

1954 • 6 citations