Precision measurement of the hydrogen-deuterium 1S-2S isotope shift.
Measuring the hydrogen-deuterium isotope shift via two-photon spectroscopy of the 1S-2S transition, we obtain 670,994,334,606(15) Hz. This is a 10-times improvement over the previous best measurement [A. Huber, Phys. Rev. Lett. 80, 468 (1998)] confirming its frequency value. A calculation of the difference of the mean square charge radii of deuterium and hydrogen results in <r2>d - <r2>p =3.82007(65)  fm2, a more than twofold improvement compared to the former value.
Parthey
Christian G
CG
Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany.
Matveev
Arthur
A
Alnis
Janis
J
Pohl
Randolf
R
Udem
Thomas
T
Jentschura
Ulrich D
UD
Kolachevsky
Nikolai
N
Hänsch
Theodor W
TW