activity
20002014
most citedNew Limits to the Drift of Fundamental Constants from Laboratory Measurements

432 citations · 4.4k across the 35 of their papers we have counts for

collaborators
Showing 2003 · physics.atom-phShow all

2 papers · 2 filters

physics.atom-ph2003★ 100 cited

Precision Spectroscopy of Atomic Hydrogen and Variations of Fundamental Constants

M. Fischer, N. Kolachevsky, M. Zimmermann +14

In 2003 we have measured the absolute frequency of the two-photon transition in atomic hydrogen. We observed a variati…

physics.atom-ph2003★ 77 cited

A clock transition for a future optical frequency standard with trapped atoms

I. Courtillot, A. Quessada, R. P. Kovacich +5

We report the first direct excitation of the strongly forbidden 5s2 1S0-5s5p 3P0 transition in 87Sr. Its frequency is 429 228 004 235 (20) kHz. A resonant laser creates a small lea…