Sub-dekahertz ultraviolet spectroscopy of 199Hg+
Abstract
Using a laser that is frequency-locked to a Fabry-Perot etalon of high finesse and stability, we probe the 5d10 6s 2S1/2 (F=0) - 5d9 6s 2D5/2 (F=2) Delta-mF = 0 electric-quadrupole transition of a single laser-cooled 199Hg+ ion stored in a cryogenic radio-frequency ion trap. We observe Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 X 1015 Hz), yielding a line Q = 1.6 X 1014. We perform a preliminary measurement of the 5d9 6s2 2D5/2 electric-quadrupole shift due to interaction with the static fields of the trap, and discuss the implications for future trapped-ion optical frequency standards.
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