Effect of nuclear mass on the bound-electron g factor

The effect of nuclear mass on the g factor of the bound electron has been determined by measuring $G=\frac{g_j\left(H\right)}{g_j\left(D\right)}$ to a precision of 3 × 10⁻¹¹ using a pulsed double-mode hydrogen maser. The result, G=1+(7.22±0.03)×10⁻⁹, is in excellent agreement with the theory of Grotch and Hegstrom.