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X-ray Flashes Provide Peek Into Atom Core

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Science  25 Oct 2002:
Vol. 298, Issue 5594, pp. 727
DOI: 10.1126/science.298.5594.727

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Using ultrashort pulses of x-rays, physicists have taken a "movie" of electrons frenetically rearranging themselves deep inside an atom. The technique opens the way for a new class of experiments in which researchers should be able to trace and control changes within atoms that take place in billionths of a billionth of a second, or attoseconds.

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