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arXiv:1507.01498 · Physical Review A

Isotope shifts and hyperfine structure of the laser-cooling Fe I 358-nm line

Nicolas Huet, Manon Pettens, Thierry Bastin

Published Nov 4, 2015• 5 citations
arXivHTMLPDF

Abstract

We report on the measurement of the isotope shifts of the $3{d}^{7}4s\phantom{\rule{0.28em}{0ex}}a\phantom{\rule{0.28em}{0ex}}{}^{5}{F}_{5}\text{--}3{d}^{7}4p\phantom{\rule{0.28em}{0ex}}z\phantom{\rule{0.28em}{0ex}}{}^{5}{G}_{6}^{o}$ Fe i line at 358 nm between all four stable isotopes $^{54}\text{Fe},\phantom{\rule{0.16em}{0ex}}^{56}\text{Fe},\phantom{\rule{0.16em}{0ex}}^{57}\text{Fe}$, and $^{58}\text{Fe}$, as well as the hyperfine structure of that line for $^{57}\text{Fe}$, the only stable isotope having a nonzero nuclear spin. This line is of primary importance for laser-cooling applications. In addition, an experimental value of the field and specific mass shift coefficients of the transition is reported as well as the hyperfine structure magnetic dipole coupling constant $A$ of the transition excited state in $^{57}\text{Fe}$, namely $A(3{d}^{7}4p\phantom{\rule{0.28em}{0ex}}z\phantom{\rule{0.28em}{0ex}}{}^{5}{G}_{6}^{o})=31.241(48)$ MHz. The measurements were carried out by means of laser-induced fluorescence spectroscopy performed on an isotope-enriched iron atomic beam. All measured frequency shifts are reported with relative uncertainties below one third percent.

DOI
10.1103/physreva.92.052507

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