Direct Observations of Structural Phase Transitions in Planar Crystallized Ion Plasmas Mitchell, T. B. ; Bollinger, J. J. ; Dubin, D. H. E. ; Huang, X. -P. ; Itano, W. M. ; Baughman, R. H. Abstract Publication: Science Pub Date: November 1998 DOI: 10.1126/science.282.5392.1290 Bibcode: 1998Sci...282.1290M