Time resolved x-ray diffraction is an attractive method of studying ultrafast structural dynamics in solids because it can directly observe the small shifts in the interatomic distance associated with the lattice dynamics. The temporal evolution of the measured x-ray diffracted intensity provides insights on the time scale of energy transfer from excited carriers to the lattice. The present talk is concerned with the laser-induced lattice dynamics (coherent acoustic phonons) in solids (InSb) and its signature in the time dependent x-ray diffracted intensity. More specifically, the following questions are addressed: (i) How the excitation energy (deposited by the laser pulse) is transferred to the lattice? and (ii) How the x-ray transient signal can be understood in frameworks of physical models that describe laser-matter interaction in conjunction with x-ray diffraction theory?

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