Sentences with phrase «caesium atoms»

For now, the most accurate definition of a second is the amount of time it takes a group of caesium atoms to swing between states 9,192,631,770 times.

The standard clock uses caesium atoms, which emit microwaves precisely 9,192,631,770 times per second.

The two clocks, one based on caesium atoms and the other on hydrogen, will communicate with a network of clocks back on Earth to compare performance across continents at a level that is equivalent to 10 trillionths of a second.

And because hydrogen molecules consist of just a handful of particles, compared with the larger caesium atoms used in atomic clocks, it would be easier to do theoretical calculations and compare them with real experiments, the team says.

Jessen's team searched for signs of chaos within a set of cooled caesium atoms, using them as the quantum equivalent of an everyday object that displays chaotic behaviour — a child's spinning top.

Caesium atoms contain electrons that orbit a nucleus, and it is possible for the direction of an electron's spin to become entangled with that of the nucleus's spin.

The pair hit two caesium atoms with rapid pulses of laser light.

A new generation of atomic tickers, known as optical clocks, have just wrested the record for accuracy from the ensembles of oscillating caesium atoms that held it for half a century.

In the 1990s, a team led by Nobel laureate Steven Chu made an «atomic fountain» of caesium atoms, launching them 30...

Using an interferometer, the team split a beam of caesium atoms into two.

In October 2004, the first quantum memory component was built from a string of caesium atoms.

Their experiment works by dropping caesium atoms above an aluminium sphere.

The NPL's atomic clocks measure how often a caesium atom's electrons jump between two energy levels — a little more than 9 billion jumps equal one second.

Not exact matches

The second is currently defined by caesium atomic clocks, but optical clocks promise higher precision because their atoms oscillate at the frequencies of light rather than in the microwave band, so they can slice time into smaller intervals.

They exploit the fact that an atom of caesium, or some other element, emits visible light or microwaves when one of its electrons drops from a high energy state to a lower one.

Most atomic clocks use atoms of the isotope caesium - 133.

Whereas iodine - 131 has a half - life of 8 days, caesium - 134 has a half - life of 2 years and caesium - 137 is a whopping 30 years — meaning it takes that long for half of the radioactive atoms in each substance to disintegrate.