Assertion: atomic clock | /r/HasProperty | based on the hyperfine transitions
Facets:
value: in hydrogen-1
type: LOCATION
value: in caesium-133
type: TEMPORAL
value: in rubidium-87
type: TEMPORAL
Source sentences:
text: Since the beginning of development in the 1950s, atomic clocks have been based on the hyperfine transitions in hydrogen-1, caesium-133, and rubidium-87.