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Digitale Medien

Topological analysis of some special graphs. III. Regular polyhedra (1991)

Lee, Shyi-Long ; Luo, Yeung-Long ; Yeh, Yeong-Nan

Springer

Journal of cluster science 2 (1991), S. 105-116

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ISSN: 1572-8862

Schlagwort(e): Electronic structure ; cluster ; eigenvectors ; Kronecker product

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract A regular polyhedron is isomorphic to a cluster on which every face has same number of bonds and every atom has an equal number of coordinating atoms. A general strategy for generating the eigenvectors and the eigenvalues of regular polyhedra is given. Net sign analyses are also performed on the eigenvectors of regular polyhedra. The results provide us a quick way to grasp the topological feature of the electronic structure of clusters having interesting topology.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00702951

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Digitale Medien

Topological analysis of some special graphs: III. Regular polyhedra (1991)

Lee, Shyi-Long ; Luo, Yeung-Long ; Yeh, Yeong-Nan

Springer

Journal of cluster science 2 (1991), S. 219-229

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ISSN: 1572-8862

Schlagwort(e): Atomic cluster ; cluster bonding ; cluster structure

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract A regular polyhedron is isomorphic to a cluster on which every face has same number of bonds and every atom has an equal number of coordinating atoms. A general strategy for generating the eigenvectors and the eigenvalues of regular polyhedra is given. Not sign analyses are also performed on the eigenvectors of regular polyhedra. The results provide us a quick way to grasp the topological feature of the electronic structure of clusters having interesting topology.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00702829

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3

Digitale Medien

Early stages of laser mixing process in Sb/Ge multilayer thin films (1993)

Serna, R. ; Afonso, C. N. ; Petford-Long, A. K. ; [weitere]

Springer

Applied physics 56 (1993), S. 132-137

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ISSN: 1432-0630

Schlagwort(e): 64.75.+g ; 78.90.+t ; 81.40.-z

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract The onset of mixing at the interfaces between Sb and Ge in thin multilayered films containing two or four layers has been studied. The films were irradiated with nanosecond laser pulses in order to trigger mixing, and in situ reflectivity measurements were used to follow the transformation in real-time. Cross sectional transmission electron microscopy analysis was used to study both the structure and the composition profile before and after irradiation. A threshold irradiation energy exists for the onset of mixing, below which roughening of the interface between the layers is observed, together with recrystallization of the surface Sb layer following melting. The results are consistent with a melting/diffusion process which is inhomogeneously nucleated at the interface between the top Sb and Ge layers. Once mixing is initiated an amorphous Sb-Ge layer of constant thickness is formed, corresponding to mixing along a well defined planar melt front. Voids are observed at the former Sb/Ge interface, which may be related to interfacial stress in the as-grown configuration.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00517680

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4

Digitale Medien

Structural ripple formation in Ge/Sb multilayers induced by laser irradiation (1994)

Serna, R. ; Afonso, C. N. ; Petford-Long, A. K. ; [weitere]

Springer

Applied physics 58 (1994), S. 197-202

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ISSN: 1432-0630

Schlagwort(e): 64.75.+g ; 78.90.+t ; 81.40.−z

Quelle: Springer Online Journal Archives 1860-2000

Thema: Maschinenbau , Physik

Notizen: Abstract Thin multilayer films (Ge/Sb/Ge/Sb/Si substrate) have been irradiated with single nanosecond laser pulses (λ=193 nm). Real-Time Reflectivity (RTR) measurements have been used to follow the transformation in situ and cross-sectional transmission electron microscope analysis was used to study both the microstructure and the composition profile before and after irradiation. Melting and mixing are both found to nucleate at preferential sites in the upper Ge/Sb interface. During this process the film surface topography changes in a way not previously seen, and rippling of the film is observed due to lateral mass flow induced in the Sb layer underneath the surface, most probably arising from volume changes upon melting. For the highest irradiation energy densities, melting of the whole multilayer configuration takes place, the ripples are no longer observed, and following cooling and solidification, a mixed amorphous GeSb film is formed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00332179

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Combination of the W boson polarization measurements in top quark decays using ATLAS and CMS data at $$ sqrt{s} $$ = 8 TeV (2020)

, ; Aad, G. ; Abbott, B. ; [weitere]

Springer

In: Journal of High Energy Physics. 2020; 2020(8): 51. Published 2020 Aug 01. doi: 10.1007/jhep08(2020)051.

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Publikationsdatum: 2020-08-01

Beschreibung: The combination of measurements of the W boson polarization in top quark decays performed by the ATLAS and CMS collaborations is presented. The measurements are based on proton-proton collision data produced at the LHC at a centre-of-mass energy of 8 TeV, and corresponding to an integrated luminosity of about 20 fb−1 for each experiment. The measurements used events containing one lepton and having different jet multiplicities in the final state. The results are quoted as fractions of W bosons with longitudinal (F0), left-handed (FL), or right-handed (FR) polarizations. The resulting combined measurements of the polarization fractions are F0 = 0.693 ± 0.014 and FL = 0.315 ± 0.011. The fraction FR is calculated from the unitarity constraint to be FR = −0.008 ± 0.007. These results are in agreement with the standard model predictions at next-to-next-to-leading order in perturbative quantum chromodynamics and represent an improvement in precision of 25 (29)% for F0 (FL) with respect to the most precise single measurement. A limit on anomalous right-handed vector (VR), and left- and right-handed tensor (gL, gR) tWb couplings is set while fixing all others to their standard model values. The allowed regions are [−0.11, 0.16] for VR, [−0.08, 0.05] for gL, and [−0.04, 0.02] for gR, at 95% confidence level. Limits on the corresponding Wilson coefficients are also derived.

Print ISSN: 1126-6708

Digitale ISSN: 1029-8479

Thema: Physik