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- Dias, E.W.B, et al.
(författare)
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Breakdown of the independent particle approximation in high-energy photoionization
- 1997
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Ingår i: Physical Review Letters. - 0031-9007. ; 78:24, s. 4553-4556
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Tidskriftsartikel (refereegranskat)abstract
- The independent particle approximation is shown to break down for the photoionization of both inner and outer nl (l > 0) electrons of all atoms, at high enough energy, owing to interchannel interactions with the nearby ns photoionization channels. The effect is illustrated for Ne 2p in the 1 keV photon energy range through a comparison of theory and experiment. The implications for x-ray photoelectron spectroscopy of molecules and condensed matter are discussed.
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- Hemmers, O, et al.
(författare)
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Beyond the dipole approximation: angular-distribution effects in valence photoemission
- 1997
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Ingår i: Journal of Physics B: Atomic, Molecular and Optical Physics. - 0953-4075. ; 30:21, s. L727-L733
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Tidskriftsartikel (refereegranskat)abstract
- Angular distributions of valence photoelectrons showing effects due to highermultipole photon interactions have been measured for the first time. Neon 2s and 2p photoemission exhibits effects beyond the dipole approximation throughout the 250 to 1200 eV photon-energy range studied. The results suggest that any photoemission experiment, on any sample, can be affected at relatively low photon energies, pointing to a general need for caution in interpreting angle-resolved-photoemission measurements.
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- Melin, L. Gunnar, et al.
(författare)
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A study of the displacement field around embedded fibre optic sensors
- 1999
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Ingår i: Composites. Part A, Applied science and manufacturing. - 1359-835X .- 1878-5840. ; 30:11, s. 1267-1275
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Tidskriftsartikel (refereegranskat)abstract
- Deformation fields around optical fibres embedded in carbon fibre/epoxy composite specimens have been measured using moiré interferometry. The inclusion of the optical fibre resulted in large strain gradients. Calculated displacements from finite element analysis were compared to the experimental results. The numerical analysis showed that the displacement field on the specimen surface is smoothed out through the moiré grating thickness, an effect which is most pronounced at the material interfaces. With this influence taken into consideration a reasonable good quantitative agreement between the experiments and the finite element analysis was obtained. The finite element analysis also showed that the grating stiffness did not affect the measured displacements as long as the grating had a lower stiffness than the specimen
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- Bohlin, Erik, 1961, et al.
(författare)
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Editorial: Political Economy of Telecom Regulation
- 1999
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Ingår i: Telecommunications Policy, Special Issue on Political Economy of Telecom Regulation, Vol. 23, No. 9, pp. 603-606.
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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