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We perform the scanning tunneling spectroscopy basedsuperconductor-vacuum-superconductor analogue to the seminal McMillan andRowell superconductor-insulator-superconductor device study of phonons in thearchetypal elemental superconductor Pb [W. L. McMillan and J. M. Rowell, Phys.Rev. Lett. 14, 108 (1965)]. We invert this spectroscopic data utilizingstrong-coupling Eliashberg theory to obtain a local {\alpha}^2F({\omega}) andfind broad underlying agreement with the pioneering results, highlighted bypreviously unobserved electron-hole asymmetries and new fine structure which wediscuss in terms of both conventional and unconventional superconductingbosonics.

Local Spectral Inversion and Bosonic Fine Structure Extraction via Superconducting Scanning Tunneling Spectroscopy