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Electron Transfer Time

This is a bit sciency to include here, but it still astounds me: they’ve actually measured the time it takes an electron to transfer from one atom to another. 320 attoseconds, or 3.2 x 10^-16 seconds. Or 0.32 femtoseconds. I’m…
July 22, 2005

This is a bit sciency to include here, but it still astounds me: they’ve actually measured the time it takes an electron to transfer from one atom to another. 320 attoseconds, or 3.2 x 10^-16 seconds. Or 0.32 femtoseconds. I’m surprised, because it’s faster than processes which take place on the nuclear scale, which are about one femtosecond.

This measurement depends on the rate of hole decay, or the “natural lifetime” of the hole, which is known to take 500 attoseconds. I don’t know how they measure that–at some point there has to be an absolute measurement here. But it’s still astonishing. The glories of science!

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Five poems about the mind

DREAM VENDING MACHINE I feed it coins and watch the spring coil back,the clunk of a vacuum-packed, foil-wrappeddream dropping into the tray. It dispenses all kinds of dreams—bad dreams, good dreams,short nightmares to stave off worse ones, recurring dreams with a teacake marshmallow center.Hardboiled caramel dreams to tuck in your cheek,a bag of orange dreams…

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"It was in the newspaper, but the towers fell the next day, and what I’d done was quickly lost."

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