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Surface-roughness-induced electric-field enhancement and triboluminescence

Lazić, Predrag; Persson, B. N. J. (2010) Surface-roughness-induced electric-field enhancement and triboluminescence. Europhysics Letters, 91 (4). pp. 46003-1. ISSN 0295-5075

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The separation of solids in adhesive contact, or the fracture of solid bodies, often results in the emission of high-energy photons, e. g., visible light and X-rays. This is believed to be related to charge separation. We propose that the emission of high-energy photons involves surface roughness and surface diffusion of ions or electrons, resulting in the concentration of charge at the tips of high asperities, and to electric-field enhancement, which facilitate the discharging process which result in the high-energy photons. If the surface diffusion is too fast, or the separation of the solid surfaces too slow, discharging starts at small interfacial separation resulting in low-energy photons.

Item Type: Article
Uncontrolled Keywords: contact mechanics; conductiviry; friction; adhesion; solids
Subjects: NATURAL SCIENCES > Physics
Divisions: Theoretical Physics Division
Depositing User: Predrag Lazić
Date Deposited: 16 Apr 2013 08:39
DOI: 10.1209/0295-5075/91/46003

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