Super-bandgap light stimulated reversible transformation and laser-driven mass transport at the surface of As.sub.2./sub.S.sub.3./sub. chalcogenide nanolayers studied in situ

0517388 - FZÚ 2020 RIV US eng J - Článek v odborném periodiku
Holomb, R. - Kondrat, O. - Mitsa, V. - Veres, M. - Czitrovszky, A. - Feher, A. - Tsud, N. - Vondráček, Martin - Veltruská, K. - Matolín, V. - Prince, K. C.
Super-bandgap light stimulated reversible transformation and laser-driven mass transport at the surface of As₂S₃ chalcogenide nanolayers studied in situ.
Journal of Chemical Physics. Roč. 149, č. 21 (2018), s. 1-11, č. článku 214702. ISSN 0021-9606. E-ISSN 1089-7690
Institucionální podpora: RVO:68378271
Klíčová slova: mass transport * laser irradiation * density functional theory * As-S structure
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 2.997, rok: 2018
Způsob publikování: Omezený přístup
https://doi.org/10.1063/1.5053228

The super-bandgap laser irradiation of the in situ prepared As-S chalcogenide filmswas found to cause drastic structural transformations and unexpected selective diffusion processes, leading to As enrichment on the nanolayer surface. Excitation energy dependent synchrotron radiation photoelectron spectroscopy showed complete reversibility of the molecular transformations and selective laserdriven mass transport during “laser irradiation”-“thermal annealing” cycles. Molecular modeling and density functional theory calculations performed on As-rich cage-like clusters built from basic structural units indicate that the underlying microscopic mechanism of laser induced transformations is connected with the realgar-pararealgar transition in the As-S structure. The detected changes in surface composition as well as the related local and molecular structural transformations are analyzed and a model is proposed and discussed in detail.
Trvalý link: http://hdl.handle.net/11104/0302717