NASA NTRS · 19780000490
Hydrogen-maser frequency standard
Abstract
Wall shift in frequency of proposed variable-shift maser that is caused by collisions between hydrogen atoms and container walls, could easily be determined, thereby allowing building of frequency standard with accuracy of 1 part in 10 to 14th power.
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Reinhardt, V., Cervenka, P.. 1979-03-01. Hydrogen-maser frequency standard. https://ntrs.nasa.gov/citations/19780000490
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