3S122−3D522interval in atomic hydrogen. II. Experiment and results

Abstract

This paper reports a double-quantum radiofrequency measurement of the $3{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}-3\mathrm{}{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}$ fine-structure interval in hydrogen. The measurement was carried out in zero magnetic field with a fast hydrogen beam. The measured value for the $3{}_{}{}^2{}_{}{}^{}S_{\frac{1}{2}}^{}{}_{}{}^{}-3\mathrm{}{}_{}{}^2{}_{}{}^{}D_{\frac{5}{2}}^{}{}_{}{}^{}$ interval is 4013.204(78) MHz. This is in good agreement with the theoretical value.