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 masher2 (blog) on 8/1/2006 1:17:51 PM , Rating: 3
> "If anything needs to be pointed out, I think it's that today, one would be hard-pressed to find a spot one could live and be a hermit."

Take a flight over the continental US and say that. There are still tens of millions of acres virtually empty. Nations like Canada and Russia are far more sparse than the US.

The belief in a world so crowded people will be forced elbow to elbow is held only by people who spend most of theirlives within 100 meters of a road.


RE: .
By kattanna on 8/1/2006 1:57:48 PM , Rating: 2
quote:
The belief in a world so crowded people will be forced elbow to elbow is held only by people who spend most of theirlives within 100 meters of a road.


agreed..as someone who spent a year and a half hitchicking all around north america i can tell you there is a LOT of wide open space.



"Young lady, in this house we obey the laws of thermodynamics!" -- Homer Simpson











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