80 citations
2 papers
physics.atom-ph2008★ 43 cited
Direct frequency comb spectroscopy of trapped ions
A. L. Wolf, S. A. van den Berg, W. Ubachs +1
Direct frequency comb spectroscopy of trapped ions is demonstated for the first time. It is shown that the 4s^2S_(1/2)-4p^2P_(3/2) transition in calcium ions can be excited directl…
cond-mat.mes-hall2008★ 80 cited
Quantum resistance metrology in graphene
A. J. M. Giesbers, G. Rietveld, E. Houtzager +5
We have performed a metrological characterization of the quantum Hall resistance in a 1 m wide graphene Hall-bar. The longitudinal resistivity in the center of the qua…