The Electron‐Beam Ion Trap

OCT 01, 1994

A small apparatus can produce any highly charged ion—hydrogen‐like or bare uranium, for example—making possible new tests of quantum electrodynamics and studies of surprising collision behavior at surfaces.

DOI: 10.1063/1.881419

Roscoe E. Marrs

Peter Beiersdorfer

Dieter Schneider

The mention of few‐electron atoms usually brings to mind hydrogen, helium or other light elements in neutral form. However, these simple atoms are part of a sequence of ions having the same number of electrons but different nuclear charges. For example, the hydrogen‐like sequence spans neutral hydrogen through hydrogen‐like uranium, $U^{91+} .$ Both the atomic physics and the applications of the most highly charged ions in such isoelectronic sequences are receiving increasing attention. Recently the electronbeam ion trap has made it possible to produce and study any such ion in a modest‐sized apparatus (figure 1).

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More about the authors

Roscoe E. Marrs, Lawrence Livermore National Laboratory, Livermore, California.

Peter Beiersdorfer, Lawrence Livermore National Laboratory, Livermore, California.

Dieter Schneider, Lawrence Livermore National Laboratory, Livermore, California.