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We have measured the isotope shift between 41 K and 39 K in the 4s 1/2 →5p 1/2 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 5p 1/2 state has a...