This paper gives the 1998 self-consistent set of values of the basic constants and conversion
factors of physics and chemistry recommended by the Committee on Data for Science and …

Spectroscopy of atomic hydrogen Page 1 Eur. Phys. J. Special Topics 172, 109–119 (2009) c
EDP Sciences, Springer-Verlag 2009 DOI: 10.1140/epjst/e2009-01045-3 THE EUROPEAN …

We have performed a pure optical frequency measurement of the 2 S− 1 2 D two-photon
transitions in atomic hydrogen and deuterium. From a complete analysis taking into account …

An absolute optical frequency measurement is made of the hyperfine components of the 5S
1 2-5D 3 2 two-photon transitions in rubidium with an uncertainty of 1.3× 10-11. This is …

We have performed a pure optical frequency measurement of the 2 S− 8 S/D two-photon
transitions in atomic hydrogen and deuterium. These frequencies are directly compared to a …

We present a detailed description of several experiments which have been previously
reported in several letters: the determination of the 1S Lamb shift in hydrogen by a …

We have measured the 1 S Lamb shift by comparing the frequencies of the 1 S 1/2− 3 S 1/2
and 2 S 1/2− 6 S 1/2 or 2 S 1/2− 6 D 5/2 two-photon transitions. Our result is 8172.798 (46) …

We have measured the hydrogen and deuterium 1S Lamb shift by direct optical frequency
comparison of the 1S-2S and 2S-4S/4D two-photon transitions. Our result of 8172.874 (60) …

One of the dominant systematic effects that shift resonance lines in high-precision
measurements of two-photon transitions is the dynamic (ac) Stark shift. For suitable laser …

We present a method to precisely measure the frequencies of transitions to high-n Rydberg
states of the hydrogen atom which are not subject to uncontrolled systematic shifts caused …