Diffraction of strongly convergent X-rays from picosecondacoustic transients

In: Applied Physics A: Materials Science & Processing, Jg. 87 (2007) ; Nr. 1, S. 7-11
ISSN: 1432-0630, 0947-8396
Zeitschriftenaufsatz / Fach: Physik
Fakultät für Physik » Experimentalphysik
Abstract:
Following femtosecond laser excitation, large transient changes in the X-raydiffraction efficiency have been observed in thin crystalline films of germanium. This behavior is explained in terms of the thermo-acoustic response of the impulsively heated material, when an inhomogeneously strained surface layer is probed by divergent X-ray beams.