On a campus in Boulder, Colorado, time just became a little more exact. Inside the National Institute of Standards and ...

Clocks on Earth are ticking a bit more regularly thanks to NIST-F4, a new atomic clock at the National Institute of Standards ...

Cesium is a metal in group IA of the periodic table with atomic number 55, an atomic weight of 132.905, and a density of 1.9 Mg/m 3. Its melting point is 28.7 C, and it boils at 690 C. The electronic ...

at least — is 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of a stationary cesium-133 atom at a temperature of 0K.

The thorium atom transition has a frequency roughly one million times higher than the cesium atom's. This means that, although it has been measured with a lower accuracy than the current state-of ...

According to scientists at NIST in Boulder, their newest atomic clock, the NIST-F4, will help track time more precisely and ...

Symmetricom has squeezed an atomic clock into 17cm3. Called the SA.45s, the cesium atom-based device is 40x35x12mm and weighs 35g. Over the -10 to 70°C operating temperature range, frequency change is ...

Results are highly encouraging as cesium is a high-value commodity due to its rarity and specialized applications. Darren L. Smith, Patriot Executive and Vice President of Exploration, comments ...

In 1967, the second was defined as the equivalent of the time it takes for a cesium 133 atom to oscillate 9,192,631,770 times between the two energy states. Cesium atomic clocks define a second ...

ranges from 0.7 for cesium to 4.0 for fluorine. The higher an element's electronegativity, the stronger its ability to attract electrons and create a partial negative charge. In a chemical bond, the ...