Mark G. Raizen, Jonathan Mark Gilligan, James C. Bergquist, Wayne M. Itano, & David J. Wineland, Linear trap for high-accuracy spectroscopy of stored ions, Journal of Modern Optics 39, 233–242 (1992).  PDF

Abstract:

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«  Precise determinations of ionization potentials and $EF$ state energy levels of H$_2$, HD, and D$_2$ | Ionic crystals in a linear Paul trap »