Spot profile analysis and lifetime mapping in ultrafast electron diffraction: Lattice excitation of self-organized Ge nanostructures on Si(001)

Spot profile analysis and lifetime mapping in ultrafast electron diffraction: Lattice excitation of self-organized Ge nanostructures on Si(001)

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Ultrafast high energy electron diffraction in reflection geometry is employed to read more study the structural dynamics of self-organized Germanium hut-, dome-, and relaxed clusters on Si(001) upon femtosecond laser excitation.Utilizing the difference in size and strain state the response of hut- and dome clusters can be distinguished by a transient spot profile analysis.Surface diffraction from {105}-type facets provide exclusive information on hut clusters.A pixel-by-pixel analysis of the dynamics of the click here entire diffraction pattern gives time constants of 40, 160, and 390 ps, which are assigned to the cooling time constants for hut-, dome-, and relaxed clusters.