Interferometric measurements ofTe2130reference frequencies for 1S-2Stransitions in hydrogenlike atoms

Abstract

The frequencies of five Doppler-free ${}_{}{}^{130}{}_{}{}^{}\mathrm{Te}_2^{}{}_{}{}^{}$ transitions at 486 and 488 nm have been measured interferometrically with reference to an iodine-stabilized 633-nm He-Ne laser. These frequencies are useful as transfer standards for 1S-2S transitions in deuterium, hydrogen, positronium, and muonium. A comprehensive study of the reproducibility of such tellurium reference standards has been made. Under the conditions specified, the frequencies of components ${\mathit{d}}_4$, ${\mathit{b}}_2$, ${\mathit{b}}_1$, ${\mathit{e}}_3$, and ${\mathit{i}}_3$ in tellurium were found to be 613881 149.1, 616 513 894.9, 616 678 855.8, 616 803 544.7, and 616 806 134.5 MHz, respectively. The overall standard deviation of frequency measurements on FM saturated tellurium spectra was 0.47 MHz across several cells, with 0.18 MHz day-to-day reproducibility for each cell. A comparison has also been made between the results reported here and our earlier measurements on tellurium [J. R. M. Barr, J. M. Girkin, A. I. Ferguson, G. P. Barwood, P. Gill, W. R. C. Rowley, and R. C. Thompson, Opt. Commun. 54, 217 (1985)].