Towards a sensitive search for variation of the fine-structure constant using radio-frequencyE1transitions in atomic dysprosium

It has been proposed that the radio-frequency electric-dipole $(E1)$ transition between two nearly degenerate opposite-parity states in atomic dysprosium should be highly sensitive to possible temporal variation of the fine-structure constant (α) [V. A. Dzuba, V. V. Flambaum, and J. K. Webb, Phys. Rev. A 59, 230 (1999)]. We analyze here an experimental realization of the proposed search in progress in our laboratory, which involves monitoring the $E1$ transition frequency over a period of time using direct frequency counting techniques. We estimate that a statistical sensitivity of | ̇ \.α/α|~10^-18/yr may be achieved and discuss possible systematic effects that may limit such a measurement.