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Abstract: We report measurements of the isotope shifts of the $3d^64s^2 a ^5D 4 -3d^64s4p z ^5F 5^o$ Fe I resonance line at 372 nm between all four stableisotopes $^{54}$Fe, $^{56}$Fe, $^{57}$Fe, and $^{58}$Fe, as well as thecomplete hyperfine structure of that line for $^{57}$Fe, the only stableisotope having a non-zero nuclear spin. The field and specific mass shiftcoefficients of the transition have been derived from the data, as well as theexperimental value for the hyperfine structure magnetic dipole couplingconstant $A$ of the excited state of the transition in $^{57}$Fe: $A3d^64s4p z^5F 5^o = 81.6986$ MHz. The measurements were done by means of Doppler-freelaser saturated-absorption spectroscopy in a Fe-Ar hollow cathode using bothnatural and enriched iron samples. The measured isotope shifts and hyperfineconstants are reported with uncertainties at the percent level.



Author: S. Krins, S. Oppel, N. Huet, J. von Zanthier, T. Bastin

Source: https://arxiv.org/







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