Atomic europium has been magnetically trapped using buffer-gas loading. Laser ablated Eu(⁸S7/2) atoms are thermalized to 800 mK in a ⁴He buffer gas (to 250 mK in a ³He buffer gas). Anti-Helmholtz superconducting coils produce a quadrupole magnetic field to trap the MJ0ex0ex=0ex0ex7/2 state of Eu. Detection is via absorption spectroscopy at 462.7 nm. Up to 1×10¹²Eu atoms are loaded at a central density of 5×10¹²0ex0excm^-3. Atoms can be held for longer than 100 s.
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Kim et al. (1997) studied this question.
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