Electron Filmed for First Time

Livescience.com via yahoo ^ | 2/25/08 | Livescience.com

[thefactor]

Scientists have filmed an electron in motion for the first time, using a new technique that will allow researchers to study the tiny particle's movements directly.

Previously it was impossible to photograph electrons because of their extreme speediness, so scientists had to rely on more indirect methods. These methods could only measure the effect of an electron's movement, whereas the new technique can capture the entire event.

Extremely short flashes of light are necessary to capture an electron in motion. A technology developed within the last few years can generate short pulses of intense laser light, called attosecond pulses, to get the job done.

"It takes about 150 attoseconds for an electron to circle the nucleus of an atom. An attosecond is 10-18 seconds long, or, expressed in another way: an attosecond is related to a second as a second is related to the age of the universe," said Johan Mauritsson of Lund University in Sweden.

Using another laser, scientists can guide the motion of the electron to capture a collision between an electron and an atom on film.

The length of the film Mauritsson and his colleagues made corresponds to a single oscillation of a wave of light . The speed of the event has been slowed down for human eyes. The results are detailed in the latest issue of the journal Physical Review Letters.

Mauritsson says the technique could also be used to study what happens in an atom when an electron leaves its shell.

[HoustonTech]

Whoa! I wasn’t ready for that!

[neverdem]

Thanks for the ping.

[neverdem]

The Uncertainty Principle

The position and momentum of a particle cannot be simultaneously measured with arbitrarily high precision. There is a minimum for the product of the uncertainties of these two measurements. There is likewise a minimum for the product of the uncertainties of the energy and time.

This is not a statement about the inaccuracy of measurement instruments, nor a reflection on the quality of experimental methods; it arises from the wave properties inherent in the quantum mechanical description of nature. Even with perfect instruments and technique, the uncertainty is inherent in the nature of things.

Graphical interpretation of uncertainty principle

[AFPhys]

LOL... camera phones are amazing to me.

Actually, I’m pretty startled about this story. It was only ten years ago or so that a friend of mine was doing research with femtosecond pulses. I hadn’t realized the horizon has been pushed into the attosecond range already