KnowraHyperfine structureLinked fromLinked fromThe 17 pages that link to Hyperfine structure, each with the reason it gives.All 17Broader topic 3Related 10Narrower topic 2Compared with 2Atomic energy levelBroader topic: It subdivides electronic levels through coupling to nuclear properties.H I regionBroader topic: Its spin interaction creates the transition responsible for the 21-centimeter emission.Caesium standardBroader topic: The standard interrogates the two ground-state hyperfine levels of caesium-133.