The output frequency of the caesium standard or caesium atomic clock is controlled by electronic transitions between the two hyperfine ground states of caesium-133 atoms. The clocks serve as the primary standard for the definition of the second in the metric system.
Caesium fountain clocks are more precise than caesium beam clocks as slower, laser-cooled atoms are used in them; more time is available to measure the resonance frequency of the caesium atoms. Fountain clocks are referred to as such because they use a fountain-like movement of atoms to obtain improved reckoning of time.
For more on how the clock works:http://1.usa.gov/1g6tx0f
Caesium fountain clocks are more precise than caesium beam clocks as slower, laser-cooled atoms are used in them; more time is available to measure the resonance frequency of the caesium atoms. Fountain clocks are referred to as such because they use a fountain-like movement of atoms to obtain improved reckoning of time.
For more on how the clock works:http://1.usa.gov/1g6tx0f
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