Abstract
We present a simulation of the laser absorption spectra of Eu atoms in the $a{}^{8}{S}_{7/2}\ensuremath{-}y{}^{8}{P}_{7/2}$ band at $462.7 \mathrm{nm}$ measured previously in a buffer-gas-loaded magnetic trap [J. Kim et al., Phys. Rev. Lett. 78, 3665 (1997)]. The simulations of the hyperfine-resolved Zeeman spectra are based on exact magnetic eigenproperties of the states involved, and yield a complete assignment of all the features observed. This reveals that apart from the ${M}_{J}=7/2$ state and its hyperfine substates, the ${M}_{J}=5/2$ and $3/2$ states are also trapped at ${B}_{\mathrm{max}}=0.52 \mathrm{T}$ and a temperature of about $250 \mathrm{mK}.$
Highlights
In a recent experiment, we trapped up to 1012 ground state Eu atoms at a temperature close to 250 mK in a buffer-gasloaded magnetic trap1͔
We present a simulation of the laser absorption spectra of Eu atoms in the a 8S7/2Ϫy 8P7/2 band at 462.7 nm measured previously in a buffer-gas-loaded magnetic trapJ
The simulations of the hyperfine-resolved Zeeman spectra are based on exact magnetic eigenproperties of the states involved, and yield a complete assignment of all the features observed. This reveals that apart from the M J ϭ7/2 state and its hyperfine substates, the M Jϭ5/2 and 3/2 states are trapped at Bmaxϭ0.52 T and a temperature of about 250 mK
Summary
We trapped up to 1012 ground state Eu atoms at a temperature close to 250 mK in a buffer-gasloaded magnetic trap1͔. In the center between the two coils is a zero field point from which the magnitude of the field increases linearly over the trapping region in any direction. This configuration confines atoms that are in the low-field-seeking statesi.e., states whose energy increases with increasing field strength; as a result, they seek regions of minimum field strength where their energy is lowest. The corresponding 3He number density decreases to about 4ϫ1013 cmϪ3 as a result of which the trapped Eu ensemble thermally uncouples from the buffer gas and from the cell. The trapped Eu atoms are detected by laser absorption spectroscopy in the a 8S7/2–y 8P7/2 band at 462.7 nm 15 GHz/s; this allows for ample data averaging at nearly fixed delay times with respect to the ablation pulse
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