Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Atomic_fountain> ?p ?o }
Showing triples 1 to 52 of
52
with 100 triples per page.
- Atomic_fountain abstract "An atomic fountain is a cloud of atoms that is tossed upwards by lasers in the Earth's gravitational field. If it were visible, it would resemble the water in a fountain. While weightless in the toss, the atoms are measured to set the frequency of an atomic clock.The primary motivation behind the development of the atomic fountain derives from the Ramsey method of measuring the frequency of atomic transitions. In broad strokes, the Ramsey method involves exposing a cloud of atoms to a brief radiofrequency (rf) electromagnetic field; waiting a time T; briefly exposing the cloud to the rf field again; and then measuring what fraction of the atoms in the cloud have transitioned. If the frequency of the rf field is identical to the atomic transition frequency, 100% of the atoms will have transitioned; if the frequency of the field differs slightly from the transition frequency, some of the atoms will not have transitioned. By repeatedly sending clouds of atoms through such an apparatus, the frequency of the field can be adjusted to match the atomic transition frequency.The precision of the Ramsey method can be increased by increasing the wait time T of the cloud. The use of an atomic fountain with a cooled atomic cloud allows for wait times on the order of one second, which is vastly greater than what can be achieved by performing the Ramsey method on a hot atomic beam. This is one reason why NIST-F1, a cesium fountain clock, can keep time more precisely than NIST-7, a cesium beam clock.".
- Atomic_fountain thumbnail Atomic_Fountain.jpg?width=300.
- Atomic_fountain wikiPageID "16899513".
- Atomic_fountain wikiPageLength "3611".
- Atomic_fountain wikiPageOutDegree "16".
- Atomic_fountain wikiPageRevisionID "671418041".
- Atomic_fountain wikiPageWikiLink Atomic_beam.
- Atomic_fountain wikiPageWikiLink Atomic_clock.
- Atomic_fountain wikiPageWikiLink Category:Atomic_clocks.
- Atomic_fountain wikiPageWikiLink Category:Atomic_physics.
- Atomic_fountain wikiPageWikiLink Category:Atoms.
- Atomic_fountain wikiPageWikiLink Category:Nuclear_technology.
- Atomic_fountain wikiPageWikiLink Jerrold_R._Zacharias.
- Atomic_fountain wikiPageWikiLink Jerrold_Zacharias.
- Atomic_fountain wikiPageWikiLink Laser.
- Atomic_fountain wikiPageWikiLink Laser_cooling.
- Atomic_fountain wikiPageWikiLink Lasers.
- Atomic_fountain wikiPageWikiLink Louis_Essen.
- Atomic_fountain wikiPageWikiLink Maxwell–Boltzmann_distribution.
- Atomic_fountain wikiPageWikiLink NIST-7.
- Atomic_fountain wikiPageWikiLink NIST-F1.
- Atomic_fountain wikiPageWikiLink Radio_frequency.
- Atomic_fountain wikiPageWikiLink Radiofrequency.
- Atomic_fountain wikiPageWikiLink Ramsey_interferometry.
- Atomic_fountain wikiPageWikiLink File:Atomic_Fountain.jpg.
- Atomic_fountain wikiPageWikiLinkText "Atomic fountain".
- Atomic_fountain wikiPageWikiLinkText "atomic fountain".
- Atomic_fountain hasPhotoCollection Atomic_fountain.
- Atomic_fountain wikiPageUsesTemplate Template:Physics-stub.
- Atomic_fountain wikiPageUsesTemplate Template:Reflist.
- Atomic_fountain subject Category:Atomic_clocks.
- Atomic_fountain subject Category:Atomic_physics.
- Atomic_fountain subject Category:Atoms.
- Atomic_fountain subject Category:Nuclear_technology.
- Atomic_fountain hypernym Cloud.
- Atomic_fountain type Company.
- Atomic_fountain type Instrument.
- Atomic_fountain type Atom.
- Atomic_fountain type Instrument.
- Atomic_fountain type Machine.
- Atomic_fountain type Mechanic.
- Atomic_fountain type Physic.
- Atomic_fountain comment "An atomic fountain is a cloud of atoms that is tossed upwards by lasers in the Earth's gravitational field. If it were visible, it would resemble the water in a fountain. While weightless in the toss, the atoms are measured to set the frequency of an atomic clock.The primary motivation behind the development of the atomic fountain derives from the Ramsey method of measuring the frequency of atomic transitions.".
- Atomic_fountain label "Atomic fountain".
- Atomic_fountain sameAs نافورة_ذرية.
- Atomic_fountain sameAs 原子泉.
- Atomic_fountain sameAs m.0411lt7.
- Atomic_fountain sameAs Q4117649.
- Atomic_fountain sameAs Q4117649.
- Atomic_fountain wasDerivedFrom Atomic_fountain?oldid=671418041.
- Atomic_fountain depiction Atomic_Fountain.jpg.
- Atomic_fountain isPrimaryTopicOf Atomic_fountain.