WATCHING ATOMS MOVE

From: Sam Wormley (swormley1_at_mchsi.com)
Date: 02/12/05 

Date: Sat, 12 Feb 2005 01:55:00 GMT

PHYSICAL REVIEW FOCUS 11 February 2005 http://focus.aps.org/
David Ehrenstein and Davide Castelvecchi, American Physical Society

Introductions to the Focus stories of the past week;
visit http://focus.aps.org for the complete stories.

WATCHING ATOMS MOVE
Researchers usually compare "before" and "after" pictures of
typical regions of a material to see how it changes during a phase
transition. But now a team has watched a specific set of atoms
continuously during a surface phase transition to see exactly how
it occurs, and has made atomic-scale movies. In the 4 February PRL
they describe their ultrastable scanning-tunneling microscope, or
STM, that can remain fixed on the same set of surface atoms, even
as the temperature rises by 100 Kelvin--a huge warming that would
cause other microscopes to "lose their place." By studying one
especially pristine region of the surface, the researchers were
able to learn how the transition occurs, atom-by-atom, in a
perfectly clean system.
(I. Brihuega et al., Phys. Rev. Lett. 94, 046101)
Link to the paper: http://link.aps.org/abstract/PRL/v94/e046101
COMPLETE Focus story and PHASE TRANSITION VIDEOS at
http://focus.aps.org/story/v15/st6

NEW FOCUS POSTER: Go to http://focus.aps.org/poster.html to download the
new poster. For free copies on glossy paper, follow the email ordering
instructions on the page.

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