Jun 29, 2015 · The choice of cesium is due to various factors. It's worth noting that your statement "Modern atomic clocks only use caesium atoms" is simply untrue. At the very least, rubidium and hydrogen clocks are common, and you can get rubidium standards on eBay for well under $200. But the best performance comes from using cesium.

Jun 21, 2017 · Caesium-133 is stable. Caesium-134 and cesium-137 are radioactive isotopes of cesium with half-lives of 2.065 years and 30.17 years respectively. Why does cesium-137 have a longer half-life if it contains three more neutrons than …

There are currently several dozen GNSS satellites in orbit. GPS and GLONASS satellites carry Rb (rubidium) and Cs (caesium) frequency standards, whereas Galileo satellites are equipped with PHM (passive hydrogen maser) and Rb clocks. In the case of BeiDou, the clocks used are of either Rb or HMAC (Hydrogen Maser Atomic Clock) standards

Jul 1, 2019 · The advantage of a cesium clock is its long term stability; however its short term stability is worse than that of a hydrogen maser. In addition, clocks, even though are of the same kind, their performance could be very different because of their noise and other factors.

$\begingroup$ From an improbable source: "Cesium has a single valence electron (unpaired) in the S-shell. In other words, it has an electron that's easy to observe (thus easy to use to tell time)." This HowStuffWorks article has a very lucid explanation of how a cesium clock actually functions. $\endgroup$ –

Mar 11, 2017 · $\begingroup$ Also, "In 1967, acting on Einstein's proof that the speed of light is the most constant dimension in the universe, the International System of Units used two specific wave counts from an emission spectrum of caesium-133 to co-define the second and the metre. Since then, caesium has been widely used in highly accurate atomic clocks."

Nov 18, 2021 · The caesium clock is good, but it's not the best timekeeper that we have. The first atomic clock was an ammonia maser built in 1949, but it was less accurate than the best quartz clocks available then. The caesium-133 clock was developed a few years later, in 1955. There have been some improvements in the design since then.

Apr 6, 2016 · I am not getting HOW the cesium oscillation is actually being counted. So from my understanding of an older atomic clock: Cesium gets heated. Heated cesium goes through magnets. Excited cesium atoms get discarded and non-excited cesium atoms get hit with microwave radiation at about $9,192,631,770 \, \mathrm{Hz} .$

Oct 17, 2018 · The caesium-133 atom has a nucleus, and that nucleus also has spin (which, as it happens is spin $7/2\ \hbar$, i.e. bigger than the electron spin). Moreover, the spins of both the nucleus and the electron are associated with magnetic dipole moments which point in the same direction as the spins. Basically, the both act like tiny bar magnets ...

Oct 29, 2019 · The slideshare.net slides Basic crystallography shows an illustration of (what looks like) the interleaved nature of the cesium and chlorine cubic arrangements in a CsCl crystal. The text on the sl...