Photoionization and Photoelectric Loading of Barium Ion Traps

Abstract

Simple and effective techniques for loading barium ions into linear Paul traps are demonstrated. Two-step photoionization of neutral barium is achieved using a weak intercombination line (6s2 1S0 <-> 6s6p 3P1, 791 nm) followed by excitation above the ionization threshold using a nitrogen gas laser (337 nm). Isotopic selectivity is achieved by using a near Doppler-free geometry for excitation of the triplet 6s6p 3P1 state. Additionally, we report a particularly simple and efficient trap loading technique that employs an in-expensive UV epoxy curing lamp to generate photoelectrons.

5 pages, Accepted to PRA 3/20/2007 -fixed typo -clarified figure 3 caption -added reference [15]

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• Direct measurement of isotope shifts in the barium 6s${}^2$ ${}^1$S${}_0$-5d6p ${}^3$D${}_1^{\text{o}}$ transition
• An Upper Bound on the Strongly Forbidden $6S_{1/2}\leftrightarrow 5D_{3/2}$ Magnetic Dipole Transition Moment in {Ba}${}^{+}$