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Quantitative knowledge of electron-phonon coupling is important for manyapplications as well as for the fundamental understanding of nonequilibriumrelaxation processes. Time-resolved diffraction provides direct access to thisknowledge through its sensitivity to laser-induced lattice dynamics. Here, wepresent an approach for analyzing time-resolved polycrystalline diffractiondata. A two-step routine is used to minimize the number of time-dependent fitparameters. The lattice dynamics are extracted by finding the best fit to thefull transient diffraction pattern rather than by analyzing transient changesof individual Debye-Scherrer rings. We apply this approach to platinum, animportant component of novel photocatalytic and spintronic applications, forwhich a large variation of literature values exists for the electron-phononcoupling parameter $G_\mathrm{ep}$. Based on the extracted evolution of theatomic mean squared displacement (MSD) and using a two-temperature model (TTM),we obtain$G_\mathrm{ep}=(3.9\pm0.2)\cdot10^{17}\frac{\mathrm{W}}{\mathrm{m}^3\hspace{1pt}\mathrm{K}}$(statistical error). We find that at least up to an absorbed energy density of$124\hspace{2pt}\frac{\mathrm{J}}{\mathrm{cm}^3}$, $G_\mathrm{ep}$ is notfluence-dependent. Our results for the lattice dynamics of platinum provideinsights into electron-phonon coupling and phonon thermalization and constitutea basis for quantitative descriptions of platinum-based heterostructures innonequilibrium conditions.

structural dynamics

Ultrafast lattice dynamics and electron-phonon coupling in platinum  extracted with a global fitting approach for time-resolved polycrystalline  diffraction data