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Phys Rev Lett. 2001 Apr 2;86(14):3072-5.

Probing impulsive strain propagation with X-ray pulses.

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Departement of Physics, University of Michigan, Ann Arbor 48109-1120, USA.


Pump-probe time-resolved x-ray diffraction of allowed and nearly forbidden reflections in InSb is used to follow the propagation of a coherent acoustic pulse generated by ultrafast laser excitation. The surface and bulk components of the strain could be simultaneously measured due to the large x-ray penetration depth. Comparison of the experimental data with dynamical diffraction simulations suggests that the conventional model for impulsively generated strain underestimates the partitioning of energy into coherent modes.

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