CC BY
8LD-I-1
LASER DIAGNOSTICS AND SPECTROSCOPY
Time-Resolved Electron Diffraction Studies of Laser-Induced Processes in
Thin Films
S.A. Aseyev1, A.A. Ischenko2, I.V. Kochikov3, B.N. Mironov1, E.A. Ryabov1
1-Institute of Spectroscopy, Russian Academy of Sciences, Fizicheskaya st. 5, 108840 Moscow, Troitsk,
Russia
2- RTU-MIREA - Russian Technological University, M. V. Lomonosov Institute of Fine Chemical Technologies
Vernadskii av. 86, 119571 Moscow, Russia 3- Faculty of Physics, Moscow State University, 119234, Moscow, Russia e-mail: Aseyev<isanfemto@yandex.ru>, Ryabov <ryabov@isan.troitsk.ru>
Using a compact diffractometer that was equipped with a pulsed electron source synchronized with a femtosecond laser, a series of studies of laser-stimulated processes in thin-film samples has been performed. It has been revealed that graphene on a copper grid placed in vacuum and exposed to the action of powerful laser radiation experiences an irreversible structural modification, which is accompanied by the breaking of carbon bonds and formation of new products. Reversible processes of the optical excitation of the crystal lattice in antimony and bismuth thin films have been investigated by ultrafast electron diffraction with a femtosecond time resolution. In a strong laser field, the generaton of coherent optical phonons has been found and their spectra has been measured.
The work is supported in part by RFBR grant № 20-02-00146a
ALT'22
