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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: Talk

Friday, March 16, 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.