Isotope Effects in the Hyperfine Structure of the Resonance Lines of Gallium I

The hyperfine structure of the lines 4033 and 4172 A of gallium i has been investigated by means of the absorption of a multiple atomic beam of high collimation. From the measurements of the structure of the line 4033 A are derived: the hfs intervals of the terms $4{}_{}{}^2{}_{}{}^{}P_{\frac{1}{2}}^{}{}_{}{}^{}$ and $5S_{\frac{1}{2}}$ for ${\mathrm{Ga}}^{69}$ and ${\mathrm{Ga}}^{71}$, the ratio of the nuclear magnetic moments, and the isotope shift; and from the line 4172 A, the hfs intervals of the term $4{}_{}{}^2{}_{}{}^{}P_{\frac{3}{2}}^{}{}_{}{}^{}$ of ${\mathrm{Ga}}^{69}$ and ${\mathrm{Ga}}^{71}$, and hence an approximate value for the quadrupole moment coupling factors for the two isotopes.