Caesium atomic clocks are one of the most accurate time and frequency standards, and serve as the primary standard for the definition of the second in the International System of Units (SI), …

Caesium has several properties that make it a good choice for an atomic clock. Whereas a hydrogen atom moves at 1,600 m/s at room temperature and a nitrogen atom moves at 510 …

2009年8月26日 · The combination of laser cooling and the fountain design allows the atomic fountain clock to observe cesium atoms for longer periods compared to traditional atomic …

To create a clock, cesium is first heated so that atoms boil off and pass down a tube maintained at a high vacuum. First they pass through a magnetic field that selects atoms of the right energy …

2024年8月22日 · Beam clocks didn’t just revolutionize timekeeping; they launched an industry. The first commercial atomic clock, the “Atomichron,” came out in 1956 and sold for $50,000 — …

It is called a caesium fountain clock where lasers concentrate the atoms into a cloud, cool them down, and then toss them upwards. This method slows the atoms down, allowing for a longer …

2025年3月28日 · The cesium clock is the most accurate type of clock yet developed. This device makes use of transitions between the spin states of the cesium nucleus and produces a …

The two most widely used atomic clocks in recent years have been the cesium beam atomic clock and the rubidium clock. Such clocks have provided the accuracy necessary to test general …

Patented Cesium II circuit and software technology detects departures of the microwave frequency from the cesium energy-level transition frequency and corrects them by tuning the …

2014年4月2日 · NIST-F1 and NIST-F2 are called fountain clocks because the cesium atoms are tossed in the air and fall back down inside a vertical tube during a key routine repeated …