Frequency measurement of the 1S0,F=5/2↔3P1,F=7/2 transition of 27Al+ via quantum logic spectroscopy with 40Ca+

Abstract

We perform quantum logic spectroscopy with a 27Al+/40Ca+ mixed ion crystal in a linear Paul trap for a measurement of the intercombination transition in 27Al+. Towards this end, Ramsey spectroscopy is used for probing the transition in 27Al+ and the (4s2)↔(4s3d)D5/2clock transition in 40Ca+ in interleaved measurements. By using the precisely measured frequency of the clock transition in 40Ca+ as a frequency reference, we determine the frequency of the intercombination line to be V1S0↔3P1,F=7/2 = 1 22842857334736(85) Hz and the Landé g-factor of the excited state to be g3P1,F=7/2= 0.428133(2).