High-Precision Optical Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

Details High-Precision Optical Measurement of the 2S Hyperfine Interval in Atomic Hydrogen High-Precision Optical Measurement of the 2S Hyperfine Interval in Atomic Hydrogen

2003-05-16

arxiv.org/abs/physics/0305073v1

Phys. Rev. Lett. 92, 033003 (2004)

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.92.033003

We have applied an optical method to the measurement of the 2S hyperfine interval in atomic hydrogen. The interval has been measured by means of two-photon spectroscopy of the 1S-2S transition on a hydrogen atomic beam shielded from external magnetic fields. The measured value of the 2S hyperfine interval is equal to 177 556 860(15) Hz and represents the most precise measurement of this interval to date. The theoretical evaluation of the specific combination of 1S and 2S hyperfine intervals D_21 is in moderately good agreement with the value for D_21 deduced from our measurement.

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