Isotope shifts of the (3s3p)$^3$P$_{0,1,2}$ - (3s4s)$^3$S$_1$ Mg I transitions

TL;DR

This study measures isotope shifts and hyperfine structure of specific magnesium transitions, providing highly accurate data that aligns well with theoretical predictions and improves upon previous measurements by up to tenfold.

Contribution

The paper presents the first precise measurements of isotope shifts and hyperfine coefficients for Mg I transitions, significantly enhancing data accuracy over prior work.

Findings

Hyperfine coefficient A($^3$S$_1$) = -321.6 ± 1.5 MHz

Agreement with theoretical A($^3$S$_1$) = -325 MHz

Measurement precision improved by up to ten times

Abstract

We report measurements of the isotope shifts of the (3s3p)$^3$P$_{0,1,2}$ - (3s4s)$^3$S$_1$ Mg I transitions for the stable isotopes $^{24}$Mg (I=0), $^{25}$Mg (I=5/2) and $^{26}$Mg (I=0). Furthermore the $^{25}$Mg $^3$S$_1$ hyperfine coefficient A($^3$S$_1$) = (-321.6 $\pm$ 1.5) MHz is extracted and found to be in excellent agreement with state-of-the-art theoretical predictions giving A($^3$S$_1$) = -325 MHz and B($^3$S$_1$) $\simeq 10^{-5}$ MHz. Compared to previous measurements, the data presented in this work is improved up to a factor of ten.