| 1. |
- Alexandrou, I, et al.
(author)
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HREM and EELS analysis of fullerene-like carbon films
- 1999
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In: Institute of Physics Conference Series. - 0951-3248 .- 2154-6630. ; :161, s. 369-372
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Journal article (peer-reviewed)abstract
- Carbon thin films were grown by Laser-Arc deposition and their structure and bonding were examined using High Resolution Electron Microscopy (HREM) and Electron Energy Loss Spectroscopy (EELS). Through focal series of HREM images reveal that the film consists of curved graphene sheets forming swirls and concentric rings with a diameter of 4-6 nm. The sheet spacing was determined by selected area diffraction to be 0.363 nm. Contrast transfer function calculations are used to explain why the pattern formed by the curved sheets is more evident at Gaussian focus rather than at Scherzer defocus, Although the films demonstrate high microhardness and elastic recovery, qualitative assessment of the EELS spectra reveals that the film consists primarily of sp(2) hybridised carbon. A model is proposed to describe how such a material made of graphene sheets can exhibit such remarkable mechanical properties.
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| 2. |
- Bengtsson, Lars, 1963, et al.
(author)
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The use of autoionizing states for efficient detection of Sr in resonance ionization mass spectrometry
- 1991
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In: Institute of Physics Conference Series. - 0951-3248. ; 114:9, s. 377-380
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Journal article (peer-reviewed)abstract
- An efficient excitation scheme for RIMS of Sr has been investigated. Two-colour excitation has been used for excitation of the atoms to an autoionization level with both transitions in the visible region. The first step excitation was at 460.733 nm (5s2 1S0 -> 5s5p 1P1) and the second step leading to ionization was at 405.32 nm which connects the first excited state with a 1D2 autoionizing state at 46380 cm-1. This type of RIMS excitation scheme ensures selectively in both steps as well as an efficient degree of ionization. The choice of the visible wavelength helps also to minimize the influence of spectral interference as well as wing excitations of matrix species.
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| 3. |
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| 4. |
- Cooray, V
(author)
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A model for positive return strokes
- 1995
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In: ELECTROSTATICS 1995. - : IOP PUBLISHING LTD. - 0951-3248. ; 143, s. 363-371
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Journal article (other academic/artistic)abstract
- A model to describe positive return strokes is presented. The basic concepts used in the model are essentially similar to those used previously to describe negative first return strokes. However, laboratory experiments indicate that the mechanism of neutr
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| 5. |
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| 6. |
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| 7. |
- Hutton, Roger, et al.
(author)
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Spectroscopic data for Hg I and Hg II from beam-foil spectroscopy
- 2004
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In: Institute of Physics Conference Series. - 0951-3248. ; 182, s. 329-330
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Conference paper (peer-reviewed)abstract
- The spectroscopic data mercury (Hg) I and Hg II was analyzed from beam-foil spectroscopy. The wavelength was found to be of course fixed and independent of the light source and recording conditions. It was found that if the calculated branching ratio was correct, then the Hg II was an important constituent of fluorescent light tube plasmas. The wavelength region from 40 to 600 nm in overlapping wavelength regions was covered, depending on the choice of gratings and detectors.
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| 8. |
- Israelsson, S
(author)
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On the effects of wind on the space charge formation in the atmospheric surface layer
- 1999
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In: ELECTROSTATICS 1999. - : IOP PUBLISHING LTD. - 0951-3248. ; 163, s. 415-420
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Journal article (peer-reviewed)abstract
- The electrode effect near the ground surface is in most cases producing an excess of positive space charges and the space charge density decreases with increasing wind speed. Negative space charge formation at ground level above a very dry ground surface
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| 9. |
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| 10. |
- Karlsson, Fredrik, 1974-, et al.
(author)
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Electrolummescence of asymmetric coupled GaAs/AlGaAs V-groove quantum wires
- 2003
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In: Institute of Physics Conference Series. - 0951-3248 .- 2154-6630. ; 174, s. 183-186
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Journal article (peer-reviewed)abstract
- We have studied systems of asymmetric coupled GaAs V-groove quantum wires, in which the electrons and holes are injected into different wires. Our experimental results indicate efficient electron and hole tunneling, despite a 7 nm thick AlGaAs tunnel barrier. Temperature dependent electroluminescence exhibit clear effects of tunneling up to room temperature but cannot distinguish electron/hole tunneling from exciton tunneling.
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