caesium atomic beam frequency standard

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• Atomic clock — Nuclear clock redirects here. For the clock as a measure for risk of catastrophic destruction, see Doomsday Clock. For a clock updated by radio signals (commonly but inaccurately called an atomic clock ), see Radio clock. For the album by Zion I …   Wikipedia

• Caesium — xenon ← caesium → barium Rb ↑ Cs ↓ Fr …   Wikipedia

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• Gold — This article is about the metal. For the color, see Gold (color). For other uses, see Gold (disambiguation). platinum ← gold → mercury …   Wikipedia

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• Niobium — zirconium ← niobium → molybdenum V ↑ Nb ↓ Ta …   Wikipedia