Abstract
We apply grazing-incidence femtosecond x-ray diffraction to investigate the details of the atomic motion connected with a displacively excited coherent optical phonon. We concentrate on the low frequency phonon associated with the charge and orbital order in the mixed valence manganite La${}_{0.25}$Pr${}_{0.375}$Ca${}_{0.375}$MnO${}_{3}$ for $T\ensuremath{\lesssim}210$ K. We measure the response of three superlattice reflections that feature different sensitivities to the motion of the unit cell constituents. The results support the assignment to a translational mode of the Mn${}^{4+}$ atoms together with the oxygen atoms connecting adjacent Mn${}^{4+}$ sites.
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