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- maser.html accessdate "2016-01-31".
- maser.html isCitedBy Hydrogen_maser.
- maser.html publisher United_States_Naval_Observatory.
- maser.html quote "The storage bulb is a quartz bulb about 20 cm tall which is coated inside with Teflon to control the recombination rate of atoms into molecules. The quartz bulb is located in a precisely machined pure copper cylinder which acts as a microwave resonant cavity for the 1.420 GHz frequency of the 21 cm hydrogen line. Once the atoms enter the resonance cavity, they find other atoms radiating and they fall in step. They "start to talk to each other" and echo what they hear. This produces a highly coherent oscillation. This is the signal to which the crystal oscillator is phase-locked. All of that is packaged in cabinets with power supplies, temperature control, and magnetic shielding.".
- maser.html title "USNO, Hydrogen Masers".
- maser.html url "http://tycho.usno.navy.mil/maser.html".