Abstract
We have measured the isotope shift between 41K and 39K in the 4s1/2→5p1/2 transition at 405nm using saturation spectroscopy. Our measured isotope shift is 456.1±0.8MHz, implying a residual isotope shift (sum of specific mass shift and field shift) of −52.7±0.8MHz. We deduce a specific mass shift of −40±5MHz, which would imply that the 5p1/2 state has a considerably larger specific mass shift than the 4p1/2 state. We have in addition measured the 5p1/2 hyperfine splitting for 41K.
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