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High accuracy frequency metrology on the 4s 2S1/2 - 4p 2P1/2 transition incalcium ions is performed using laser cooled and crystallized ions in a linearPaul trap. Calibration is performed with a frequency comb laser, resulting in atransition frequency of f=755222766.2(1.7) MHz. The accuracy presents animprovement of more than one order of magnitude, and will facilitate acomparison with quasar data in a search for a possible change of the finestructure constant on a cosmological time scale.

Frequency metrology on the 4s 2S1/2 - 4p 2P1/2 transition in the calcium ion for a comparison with quasar data