Multi-Phonon Excitations in Fe 2p RIXS on Mg2FeH6

Multi-phonon excitations, indicating a strong electron–phonon coupling, were observed by soft X-ray resonant inelastic X-ray scattering of Mg2FeH6 and Mg2FeD6. The Fe–H/D stretch and bend modes are selectively activated by the tuned electron excitation to eg brach of Fe 3d states in octahedral symmetry. The energy deviation with the factor of \( {\sim} \sqrt{2} \) due to the isotope effect was clearly observed.

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