Atomic and molecular physics it the study of the properties, dynamics and interactions of the basic (but not fundamental) building blocks of matter. A crucial component of this is understanding ...

Atomic clocks are the most precise timepieces in the world. Modern versions are so accurate that they may gain or lose only a second over a period comparable to the age of the universe. At the core of ...

An optical lattice clock is a type of atomic clock that can be 100 times more accurate than cesium atomic clocks, the current standard for defining "seconds." Its precision is equivalent to an ...

Optical lattice clock (1) is a type of atomic clock that can be 100 times more accurate than cesium atomic clocks, the current standard for defining “seconds.” Its precision is equivalent to ...

The International System of Units then changed things, settling for this definition: The second… is defined by taking the… transition frequency of the caesium-133 atom, to be 9192631770 when ...

whose transition frequency is higher than caesium and falls within the range of visible light. This opens up the possibility of re-defining the second by 2030. In September 2024, US scientists made ...

An optical lattice clock is a type of atomic clock that can be 100 times more accurate than cesium atomic clocks, the current standard for defining "seconds." Its precision is equivalent to an ...

This is a “caesium fountain”, called Nist-F3, and it is the tuning fork for America’s official atomic clocks, the ur-clock. It rings not sound but microwaves. The best caesium clocks count ...

Optical lattice clock (1) is a type of atomic clock that can be 100 times more accurate than cesium atomic clocks, the current standard for defining “seconds ...

Should the bill pass the Senate, it would give the Executive Branch power to indiscriminately silence dissent at any nonprofit on a variety of issues. (The Bulletin of the Atomic Scientists is an ...

Editor’s note: This story was originally published by Vox. It appears here as part of the Climate Desk collaboration. Over the weekend, a very small wildfire broke out in a hilly and densely vegetated ...