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Over 8 months, we monitored transition frequencies between nearly degenerate, opposite-parity levels in two isotopes of atomic dysprosium (Dy). These frequencies are sensitive to variation of the fine-structure constant (alpha) due to relativistic corrections of opposite sign for the opposite-parity levels. In this unique system, in contrast to atomic-clock… (More)
A new method for examining the possible space-time variation of the fine structure constant (α) is proposed. The technique uses a relatively simple measurement with an optical resonator to compare atom-stabilized optical frequency references. This method does not require that the exact frequency of each reference be measured, and has the potential to yield… (More)
We have successfully trapped singly and doubly ionized Ytterbium in a linear RF quadrupole trap. Ionization was accomplished with both photoionization and electron beam ionization. Co-trapping of Yb<sup>+</sup> and Yb<sup>2+</sup> was confirmed through electronic detection.