Category
page 1Atomic clocks
atomic clock
extremely accurate reference clock used as a standard for timekeeping
Deep Space Atomic Clock
Atomic clock used for radio navigation in space
hydrogen maser
type of maser
nuclear clock
Clock based on an atomic nucleus instead of an atom
atomic fountain
cloud of atoms that is tossed upwards by lasers in the Earth's gravitational field
caesium standard
primary frequency standard in which the photon absorption by transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency
quantum clock
atomic clock with laser cooled single ions confined together in an electromagnetic ion trap
Atomic Clock Ensemble in Space
experiment on the International Space Station
NIST-F1
thumb|250px|right|NIST-F1, source of the official time of the United States