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The excitation energy of the 1/2$^-$ isomer in $^{99}$In at ${N=50}$ ismeasured to be 671(37) keV and the mass uncertainty of the 9/2$^+$ ground stateis significantly reduced using the ISOLTRAP mass spectrometer at ISOLDE/CERN.The measurements exploit a major improvement in the resolution of themulti-reflection time-of-flight mass spectrometer. The results reveal anintriguing constancy of the $1/2^-$ isomer excitation energies inneutron-deficient indium that persists down to the $N = 50$ shell closure, evenwhen all neutrons are removed from the valence shell. This trend is used totest large-scale shell model, \textit{ab initio}, and density functional theorycalculations. The models have difficulties describing both the isomerexcitation energies and ground-state electromagnetic moments along the indiumchain.

Isomeric excitation energy for $^{99}$In$^{m}$ from mass spectrometry reveals constant trend next to doubly magic $^{100}$Sn