Detecting optically synthesized quasi-monochromatic sub-terahertz phonon wavepackets by ultrafast x-ray diffraction. - Herzog, M.; Bojahr, A.; Goldshteyn, J.; Leitenberger, W.; Vrejoiu, I.; Khakhulin, D.; Wulff, M.; Shayduk, R.; Gaal, P.; Bargheer, M. (Applied Physics Letters, 2012)