Phase-Coherent Measurement of the Hydrogen S-1- S-2 Transition Frequency with an Optical Frequency Interval Divider Chain - INSPIRE

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Phase-Coherent Measurement of the Hydrogen S-1- S-2 Transition Frequency with an Optical Frequency Interval Divider Chain

Oct 6, 1997

3 pages

Published in:

Phys.Rev.Lett. 79 (1997) 2646-2649

DOI:

10.1103/PhysRevLett.79.2646

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Abstract: (APS)

We have measured the absolute frequency of the hydrogen 1S−2S two-photon resonance with an accuracy of 3.4 parts in 1013 by comparing it with the 28th harmonic of a methane-stabilized 3.39μm He-Ne laser. A frequency mismatch of 2.1 THz at the 7th harmonic is bridged with a phase-locked chain of five optical frequency interval dividers. From the measured frequency f1S−2S=2466061413187.34(84)kHz and published data of other authors we derive precise new values of the Rydberg constant, R∞=10973731.568639(91)m−1 and of the Lamb shift of the 1S ground state, L1S=8172.876(29)MHz. These are now the most accurate values available.

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