2011
DOI: 10.1038/ncomms1197
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Vibrational dynamics and surface structure of amorphous selenium

Abstract: In contrast to crystalline solids in which structural order governs dynamics and thermodynamics, the lack of long-range periodicity in amorphous materials is responsible for several anomalies. Although the relation between these anomalies and the 'bulk structure' is generally understood, the surface structure and the corresponding vibrational spectrum of amorphous solids is practically an unexplored theme. In this study, we resolve the differences in vibrational dynamics and atomic structure between bulk and s… Show more

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Cited by 38 publications
(27 citation statements)
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“…The higher energy of the a-Te intra-chain vibrational mode in relation to its crystalline counterpart, originates from the weaker inter-chain interactions in a-Te, which causes strengthening of the intra-chain vibrations. This effect is also observed in the isomorphous crystalline and glassy Se3233. These findings demonstrate that the nano-structuring of the surface at low light fluence and short times originates from the combination of two photo-induced effects, i.e.…”
Section: Discussionsupporting
confidence: 61%
“…The higher energy of the a-Te intra-chain vibrational mode in relation to its crystalline counterpart, originates from the weaker inter-chain interactions in a-Te, which causes strengthening of the intra-chain vibrations. This effect is also observed in the isomorphous crystalline and glassy Se3233. These findings demonstrate that the nano-structuring of the surface at low light fluence and short times originates from the combination of two photo-induced effects, i.e.…”
Section: Discussionsupporting
confidence: 61%
“…First, the resulting SeNPs are substantially larger than practical; second, other GSHRs, nitrite reductases, and thioredoxin 65 may also produce background particles. While these enzymes are not characterized in vitro as producing SeNPs, they are characterized as using SeO 3 2− as a substrate.…”
Section: Discussionmentioning
confidence: 99%
“…Another possibility for matter motion is photoinduced dipoles created by light after scission of the weak bonds of over-coordinated atoms (e.g. hypervalent defects in a-Se, i.e., three-fold and four-fold coordinated Se atoms [26]). Under optical electric field, the photoinduced dipoles can lower their energy by changing configuration and/or aligning in the direction along or perpendicular to the polarization of incident light (in case of linear polarization).…”
Section: Fig 4 Afm Images Of the Topography Of Asmentioning
confidence: 99%