Mark G. Raizen, Jonathan Mark Gilligan, James C. Bergquist, Wayne M. Itano, & David J. Wineland, Ionic crystals in a linear Paul trap, Physical Review A 45, 6493–6501 (1992). PDF Abstract:
Mark G. Raizen, Jonathan Mark Gilligan, James C. Bergquist, Wayne M. Itano, & David J. Wineland, Ionic crystals in a linear Paul trap, Physical Review A 45, 6493–6501 (1992). PDF