Bragg diffraction from crystallized ion plasmas |
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Authors: | WM Itano JJ Bollinger JN Tan B Jelenkovic X Huang DJ Wineland |
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Institution: | Time and Frequency Division, National Institute of Standards and Technology, Boulder, CO 80303, USA. |
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Abstract: | Single crystals of a one-component plasma were observed by optical Bragg diffraction. The plasmas contained 10(5) to 10(6) single-positive beryllium-9 ions (9Be+) at particle densities of 10(8) to 10(9) per cubic centimeter. In approximately spherical plasmas, single body-centered cubic (bcc) crystals or, in some cases, two or more bcc crystals having fixed orientations with respect to each other were observed. In some oblate plasmas, a mixture of bcc and face-centered cubic ordering was seen. Knowledge of the properties of one-component plasma crystals is required for models of white dwarfs and neutron stars, which are believed to contain matter in that form. |
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