原子鐘

原子鐘係指以原子嘅激發狀態發出電磁波作為計時原理嘅鐘，係一種非常之精密嘅鐘。

National Research Council Canada, FAQ: “What is a ‘cesium atomic clock’?”
 National Research Council Canada, archived content: Optical frequency standard based on a single trapped ion
 United States Naval Observatory Time Service Department
 PTB Braunschweig, Germany - with link in English language
 National Physical Laboratory (UK) time website
 NIST Internet Time Service (ITS): Set Your Computer Clock Via the Internet
 NIST press release about chip-scaled atomic clock
 NIST website
 Web pages on atomic clocks by The Science Museum (London)
 Optical Atomic Clock BBC, 2005
 Optical lattice clock; Journal of the Physical Society of Japan
 The atomic fountain
 National Research Council of Canada, archived content: Optical Frequency Comb – The Measurement of Optical Frequencies

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