We report the successful resolution of the multiplet structure of ${K\alpha }_1$ x-ray emission in manganese ($\mathrm{Mn}$) complexes through seeded stimulated x-ray emission spectroscopy (seeded S-XES). Using a femtosecond pump pulse above the $\mathrm{Mn}$ $K$ edge to generate simultaneous $1s$ core holes, and a second-color tunable seed pulse to initiate the stimulated emission process, we were able to enhance individual lines within the ${K\alpha }_1$ emission. This approach allows to resolve the fine multiplet features that are obscured by lifetime broadening in conventional (spontaneous) $\mathrm{Mn}$ $K\alpha$ XES. The work builds on our previous observation that S-XES from $\mathrm{Mn}$(II) and $\mathrm{Mn}$(VII) complexes pumped at high intensities can exhibit stimulated emission without sacrificing the chemical sensitivity to oxidation states. This technique opens the door to controlled high-resolution electronic structure spectroscopy in transition-metal complexes beyond the core-hole lifetime, with potential applications in catalysis, inorganic chemistry, and materials science.

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• Chemical Physics & Physical Chemistry
• Electronic structure of atoms & molecules
• Light-matter interaction
• Ultrafast phenomena
• Free-electron lasers
• Molecules
• Ultrafast femtosecond pump probe
• X-ray emission spectroscopy