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Contrasting behavior of covalent and molecular carbon allotropes exposed to extreme ultraviolet and soft x-ray free-electron laser radiation.

Authors :
Toufarová, M.
Hájková, V.
Chalupský, J.
Burian, T.
Vacík, J.
Vorlíček, V.
Vyšín, L.
Gaudin, J.
Medvedev, N.
Ziaja, B.
Nagasono, M.
Yabashi, M.
Sobierajski, R.
Krzywinski, J.
Sinn, H.
Störmer, M.
Koláček, K.
Tiedtke, K.
Toleikis, S.
Juha, L.
Source :
Physical Review B. 12/1/2017, Vol. 96 Issue 21, p1-1. 1p.
Publication Year :
2017

Abstract

All carbon materials, e.g., amorphous carbon (a-C) coatings and C60 fullerene thin films, play an important role in short-wavelength free-electron laser (FEL) research motivated by FEL optics development and prospective nanotechnology applications. Responses of a-C and C60 layers to the extreme ultraviolet (SPring-8 Compact SASE Source in Japan) and soft x-ray (free-electron laser in Hamburg) free-electron laser radiation are investigated by Raman spectroscopy, differential interference contrast, and atomic force microscopy. A remarkable difference in the behavior of covalent (a-C) and molecular (C60) carbonaceous solids is demonstrated under these irradiation conditions. Low thresholds for ablation of a fullerene crystal (estimated to be around 0.15 eV/atom for C60 vs 0.9 eV/atom for a-C in terms of the absorbed dose) are caused by a low cohesive energy of fullerene crystals. An efficient mechanism of the removal of intact C60 molecules from the irradiated crystal due to Coulomb repulsion of fullerene-cage cation radicals formed by the ionizing radiation is revealed by a detailed modeling. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
24699950
Volume :
96
Issue :
21
Database :
Academic Search Index
Journal :
Physical Review B
Publication Type :
Academic Journal
Accession number :
127996078
Full Text :
https://doi.org/10.1103/PhysRevB.96.214101