ammonia clock
Definition
Noun: An ammonia clock is a type of atomic clock that uses the precise vibrational frequency of the nitrogen atom within an ammonia molecule as its timekeeping standard.
Usage
The term ammonia clock is used specifically to refer to this early and specific type of atomic timekeeping device. * The first ammonia clock was developed in the 1940s, paving the way for more accurate cesium clocks. * While less common today, the ammonia clock was a crucial step in the history of precision time measurement.
Advanced Usage
- Historical Context: The ammonia clock is often discussed in historical and technical contexts about the evolution of atomic clocks, as it was one of the first practical implementations of atomic frequency standards.
Variants and Related Words
- Atomic clock (n): The broader category of clocks that use the resonance frequencies of atoms as a timekeeping element. An ammonia clock is a specific type of atomic clock.
- Maser (n): A device that produces coherent microwave radiation, often using ammonia; the technology is closely related to the principle of the ammonia clock.
Synonyms
- Ammonia maser clock: A more technical synonym that emphasizes the use of maser technology.
Related Phrases
- Based on the ammonia molecule: A descriptive phrase explaining the operational principle of the ammonia clock.
Noun
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an atomic clock based on vibrational frequency of the nitrogen atom in the ammonia molecule
