Abstract
I will present high-resolution isotope shift spectroscopy of five calcium isotopes using direct frequency-combdriven Raman transitions between the terahertz-spaced 3d 2D3/2 and 3d 2D5/2 levels. Fig.1.c) shows absolute frequency measurements on a single 40Ca+ [1]. The achieved relative accuracy of 5.5×10−12 is nearly a factor of five better than the previous best Raman spectroscopy [2], and is currently limited by the inaccuracy of our atomic clock reference. By performing similar measurements on 42,44,46,48Ca+ ions, we determined the isotope shift of this transition with an accuracy of about 25 Hz. These measurements in combination with precise measurements of the 4s 2S1/2 −3d 2D5/2 transition are today’s best isotope shift measurements to our knowledge and allow for improved bounds on new physics beyond the standard model [3].
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