New Mercury-Ion Atomic Clock Accurate for 400 Million Years
August 1, 2006 10:21 AM
comment(s) - last by
According to reports published in the
Physical Review Letter
, the National Institute of Standards Technology (NIST) published a paper indicating that it had
discovered a new type of atomic clock based on mercury-ion
. The report said that the new atomic clock is so accurate it's nearly 6 times more precise than the current cesium-based atomic clock.
The report said that the NIST currently operates a cesium-based atomic clock called the NIST-F1, which is accurate for roughly 70 million years. If operated continuously, the NIST-F1 would only be off by 1 second after 70 million years. The new mercury-ion atomic clock on the other hand will take 400 million years.
The new experimental clock measures the atomic resonance frequency of a mercury atom. The atom itself is electrically charged and kept in an extremely cold suspension. Using the new mercury-ion atomic clock, scientists at the NIST say that they will be able to conduct more precise experiments and further develop applications that rely on atomic-time accuracy such as GPS systems. Currently, the international standard that defines what one second is relies on cesium-based atomic clocks -- 9,192,631,770 radiation cycles of the change between two energy levels of a cesium atom. The NIST says that it will be five to ten years before we see mercury-ion clocks replace cesium ones.
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RE: Doomsday Clock
8/1/2006 5:35:26 PM
>"I would thoroughly recommend Kubrick's film Dr. Strangelove (or How I Learned to Stop Worrying and Love the Bomb) for a comic, but nonetheless accurate analysis..."
One of my favorite movies...but certainly not an accurate analysis even when it was made in the 1960s, and certainly nowhere near reality today.
RE: Doomsday Clock
8/1/2006 7:30:30 PM
Have to agree there. The "accurate" got left in after some judicious editing of the post. It was actually part of another sentence no longer existing. Whoops! (and whoops for reply to wrong post again)
Doomsday movies [with spoilers]
8/1/2006 11:51:23 PM
In 1983 the movie 'WarGames' was released with a plot based on a computer system designed to track nukes and control USA nukes confuses reality with AI learning of a game (simulation). WorldWarIII and world annihilation is narrowly avoided. 'The only way to win the game [survive] is to not play' (paraphrase).
'The Bedford incident'(1865) while not nuclear it is another good example of what can happen when people are stressed and the CO is trigger-happy. If you up the anti and then fire, both sides end up dead.
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