Precision spectroscopy of hydrogen and deuterium
Nature 330:6147 (1987) 463-465
Abstract:
The hydrogen atom is an important testing ground for fundamental physical theory, because it is the simplest stable atomic system and its properties can be calculated to enormous precision. Measurements on hydrogen played a major role in the development of quantum electrodynamics (QED), a theory of electromagnetic interactions which includes quantization of the radiation field1,2. Tests of QED in hydrogen involve precision measurements of transition frequencies; the transition generally studied is between two excited states (2s2S1/2 and 2p2P1/2). Much higher precision is possible if a transition involving the ground state is studied, but this potential has not so far been exploited because of experimental difficulties. We have now carried out an experiment of this type which has given preliminary results and opens new possibilities for precision tests of QED in the future. © 1987 Nature Publishing Group.HIGH-RESOLUTION LASER SPECTROSCOPY OF THE 1S-2S TRANSITION IN ATOMIC-HYDROGEN
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS 3:8 (1986) P162-P162
Continuous-wave two-photon spectroscopy of the 1S-2S transition in hydrogen.
Phys Rev Lett 54:17 (1985) 1913-1916
Laser spectroscopy of calcium isotopes
Journal of Physics B: Atomic and Molecular Physics 17:11 (1984) 2197-2211
Abstract:
Improved measurements of isotope shifts in the 4s21S0-4s5s 1S0 transition of calcium are reported for the stable isotopes. A comparison with isotope shift measurements in other transitions by means of a King plot shows satisfactory agreement. Values of the changes in mean-square nuclear charge radius delta (r2) from a combined analysis of muonic isotope shifts and electron scattering data are used to separate the mass and field shifts in the optical lines. This procedure leads to values of delta (r2) for the calcium isotopes from 40Ca to 48Ca using all available high-precision data. The results for delta (r2)A,40 are 3.2(2.5), 215.3 (4.9), 125.4 (3.2), 283.2 (6.4), 118.8 (5.9), 124.2 (5.0), 5 (13) and -4.4(6.0)*10-3 fm2 for A=41 to 48 respectively. Values of the electronic factors relating the observed shifts of delta (r2) are deduced, and discussed in terms of configuration mixing in calcium.Generation of cw 243 nm radiation and application to laser spectroscopy of the strontium isotopes
Optics Communications 50:3 (1984) 199-204