Frequency measurement of the 2S-12D transitions in hydrogen and deuterium, new determination of the Rydberg constant

摘要

We have performed the first pure frequency measurement of the 2S-12D two-photon transitions in atomic hydrogen and deuterium. These frequencies are compared to two optical standards, the CO/sub 2/ laser stabilized on the OsO/sub 4/ molecule and the optical rubidium laser standard (LD/Rb) (namely, a laser diode at 778 nm stabilized on the 5S/sub 1/2/-5D/sub 5/2/ two-photon transition of rubidium). The main part of the experiment is located in the Laboratoire Kastler-Brossel (LKB), one part of the frequency chain is in the Laboratoire Primaire du Temps et des Frequences (LPTF), and two 3 km long optical fibers link the two parts of this experiment. The new value of the Rydberg constant is R/sub /spl infin//=109 737.315 686 06 (79) cm/sup -1/.