Figure 1.

Experimental ion yield spectrum (solid red line) and computational TD‐DFT X‐ray absorption spectrum for the ${}^1{A}_1{}^{\text{'}}$ ground state (dashed black line) of ${\left[{\mathrm{RhO}}_3\right]}^{+}$ , at the oxygen K‐edge, with very good agreement for the transitions below 542 eV.