Dipole moment of PH+ and the atomic masses of Si28, P31 by comparing cyclotron frequencies of two ions simultaneously trapped in a penning trap

Matthew Redshaw, Joseph McDaniel, Edmund G. Myers

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Abstract

By trapping pairs of ions in a Penning trap, alternating each ion between large and small cyclotron orbits, we have measured the cyclotron frequency ratios C212H4+/Si+28, C213H2+/Si+28, SiH3+28/P+31, and O2+16/31PH+, all to <30ppt precision. The O2+16/31PH+ data exhibit a bimodal distribution due to the polarizability of the Λ-doubling components of the PH+ ground state, from which we obtain the electric dipole moment of PH+31, 0.331(8) ea0. Combined with other atomic mass measurements we also obtain improved values for m(Si28), 27.9769265350(6)u, and m(P31), 30.9737619989(9)u.

Original languageEnglish
Article number093002
JournalPhysical Review Letters
Volume100
Issue number9
DOIs
StatePublished - Mar 5 2008

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