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In telecommunication, a caesium standard is a primary frequency standard in which electronic transition s between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency.

Note: The energy level between the two hyperfine ground states corresponds, in the absence of external influences (e.g., the Earth's magnetic field), to a frequency of 9,192,631,770 Hz.

Source: from Federal Standard 1037C and from MIL-STD-188

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CaesiumCaesium (also spelled cesium and pronounced /'sizm/, though it goes against Latin phonetics) is a chemical element in the periodic table that has the symbol Cs and atomic number 55. It is a soft silvery-gold Alkali metal which is one of at least three met

Caesium standardIn telecommunication, a caesium standard is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms is used to control the output frequency. Note: The energy level between the two hyperfine

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