backtop


Print 68 comment(s) - last by masher2.. on Aug 3 at 12:37 PM

Redefining time

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.



Comments     Threshold


This article is over a month old, voting and posting comments is disabled

RE: .
By kitchme on 8/1/2006 1:30:21 PM , Rating: 2
Perhaps they just liked a good pint of beer. Why didn't they just boil water, and then drink it?


RE: .
By Ringold on 8/1/2006 3:18:55 PM , Rating: 2
quote:
Perhaps they just liked a good pint of beer. Why didn't they just boil water, and then drink it?


And pass up a chance to drink beer?

More seriously though, didn't beer at the time have a ton more in it than just alcohol, like our beers today? It was my perception they weren't just a drink but actually practically a meal replacement. I could be wrong, though. Probably am.


"Game reviewers fought each other to write the most glowing coverage possible for the powerhouse Sony, MS systems. Reviewers flipped coins to see who would review the Nintendo Wii. The losers got stuck with the job." -- Andy Marken











botimage
Copyright 2014 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki