Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 116: Focus Session: Structural Dynamics in Nanoscale Materials, Probed by Ultrafast Electron Pulses III
O 116.8: Vortrag
Freitag, 16. März 2018, 12:30–12:45, HE 101
Ultrafast electron diffraction in Troitsk: present state and perspectives — •Sergei Aseyev1, Boris Mironov1, Victor Kompanets1, Anatoly Ischenko2, Oleg Misochko3, Sergei Chekalin1, and Evgeny Ryabov1 — 1Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow, 108840 Russia — 2Moscow Technological University, pr. Vernadskogo 86, Moscow, 119571 Russia — 3Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432 Russia
The generation of coherent optical phonons in Sb film has been directly observed using table-top ultrafast electron diffractometer. The sample has been excited by a femtosecond laser pulse (λ = 800 nm) and probed with femtosecond photoelectron beam. Oscillations of the intensity corresponding to vibration frequencies of optical phonons excited by the laser have been observed in the obtained diffraction patterns: totally symmetric (A1g) and twofold degenerate (E2g) phonon modes of antimony and their combinations. Ultrafast electron diffraction method paves the way to study nonlinear phononics in perovskites and nonlinear photonics in molecular clusters.