Precision continuous-wave laser measurement of the ${\text{1}}^{\text{3}}{\text{S}}_{\text{1}}\to {\text{2}}^{\text{3}}{\text{S}}_{\text{1}}$ interval in positronium

Lucas de Sousa Borges, Edward Thorpe-Woods, Evans Javary +1

We report a 4.9\,ppb measurement of the positronium ${\text{1}}^{\text{3}}{\text{S}}_{\text{1}}\to {\text{2}}^{\text{3}}{\text{S}}_{\text{1}}$ interval using continuous-wave two-photon laser spec…