| 1. |
- Azevedo, GD, et al.
(författare)
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Direct observation of structural relaxation in amorphous compound semiconductors
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 206, s. 1024-1027
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Tidskriftsartikel (refereegranskat)abstract
- Extended X-ray absorption fine structure measurements have been used to characterize, at the atomic level, the thermally induced structural relaxation of InAs amorphized by ion implantation. Our results are consistent with a relaxation mechanism mediated by point-defect annihilation with concomitant reduction in both chemical and structural disorder. Though relaxation yields a decrease in chemical disorder, homopolar bonding is still retained in the fully relaxed amorphous structure. (C) 2003 Elsevier Science B.V. All rights reserved.
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| 2. |
- Azevedo, GD, et al.
(författare)
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EXAFS measurements of metal-decorated nanocavities in Si
- 2003
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 199, s. 179-184
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Konferensbidrag (refereegranskat)abstract
- This contribution presents a sample preparation methodology to enable the identification, with synchrotron radiation-based analytical techniques, of the gettering sites of metallic impurities on the internal walls of implantation-induced nanocavities in Si substrates. Preliminary results for the Cu-Si and Cu-Cu bond lengths on the internal surface of the nanocavities are reported. (C) 2002 Elsevier Science B.V. All rights reserved.
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| 3. |
- Azevedo, GD, et al.
(författare)
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Structural characterization of amorphised InAs with synchrotron radiation
- 2002
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Ingår i: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 190, s. 851-855
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Konferensbidrag (refereegranskat)abstract
- Extended X-ray absorption fine structure measurements have been utilized to determine the structural parameters of InAs amorphised by ion implantation. Relative to crystalline standards, increases in bond length and Debye-Walter factor were apparent. Our results indicate that a total coordination number of four atoms, as observed in the crystalline phase, is retained in the amorphous material. Furthermore, homopolar bonding, forbidden in the crystalline phase, is present in the amorphous material and, apparently, in amorphous III-V semiconductors in general.
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| 4. |
- Bergmann, U. C., et al.
(författare)
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Production yields of noble-gas isotopes from ISOLDE UCx/graphite targets
- 2003
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Ingår i: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 204, s. 220-224
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Tidskriftsartikel (refereegranskat)abstract
- Yields of He, Ne, Ar, Kr and Xe isotopic chains were measured from UCx/graphite and ThCx/graphite targets at the PSB-ISOLDE facility at CERN using isobaric selectivity achieved by the combination of a plasma-discharge ion source with a water-cooled transfer line. The delay times measured for a UCx/graphite target allow for an extrapolation to the expected yields of very neutron-rich noble gas isotopes, in particular for the "NuPECC reference elements" Ar and Kr, at the next-generation radioactive ion-beam facility EURISOL. (C)2003 Elsevier Science B.V. All rights reserved.
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| 5. |
- Bogdanovich, P, et al.
(författare)
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Theoretical lifetimes for all states of five Cl X configurations
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 205, s. 70-73
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Tidskriftsartikel (refereegranskat)abstract
- Ab initio calculations including relativistic and correlation corrections were performed to obtain energy spectra and lifetimes for all states of first five configurations of Cl X.
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| 6. |
- Bulow, K, et al.
(författare)
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The penetration depth and lateral distribution of pigment related to the pigment grain size and the calendering of paper
- 2002
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 189, s. 308-314
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Tidskriftsartikel (refereegranskat)abstract
- The interaction of ink and newspaper has been investigated and the specific question of penetration of ink into the paper has been addressed with a nuclear microprobe using particle induced X-ray emission, The penetration depth of the newsprint is a critical factor in terms of increasing the quality of newsprint and minimising the amount of ink used. The objective of the experiment was to relate the penetration depth of pigment with the calendering of the paper, The dependence of the penetration depth on the pigment grain size was also Studied, To Study the penetration depth of pigment in paper, cyan ink with Cu as a tracer of the coloured pigment was used, For the study of the penetration depth dependence of pigment size. specially grounded Japanese ink with well-defined pigment grain size was used. This was compared to Swedish ink with pigment grains with normal size-distribution, The results show that the calendering of the paper considerably affects the penetration depth of ink. (C) 2002 Elsevier Science B.V. All rights reserved.
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| 7. |
- Glover, Chris, et al.
(författare)
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Structure of amorphous silicon investigated by EXAFS
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 199, s. 195-199
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Tidskriftsartikel (refereegranskat)abstract
- The local structure of amorphous Si (a-Si) formed by ion implantation has been investigated at the Si K edge with extended X-ray absorption fine structure spectroscopy (EXAFS). The first four cumulants of the interatomic distance distribution have been determined using the Cumulant method. The structural parameters (bondlength, coordination number and Debye-Waller factor) compared favorably to previous EXAFS investigations of a-Si prepared by sputtering methods, however, in the ion implanted case, no asymmetry was detectable in the radial distribution function for a-Si. The present results are in excellent agreement with recent high resolution X-ray diffraction measurements of a-Si, but were found to differ in regards the ion dose dependent structure of another Group IV semiconductor: a-Ge. Specifically, no ion dose dependence of the a-Si structural parameters were observed. (C) 2002 Elsevier Science B.V. All rights reserved.
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| 8. |
- Huang, M, et al.
(författare)
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The continuing saga of the Si-like intercombination lines in highly charged ions, Si-like rhodium
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 205, s. 119-122
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Tidskriftsartikel (refereegranskat)abstract
- The 3s(2)3p(2 3)P(1.2)-3s3p(3) S-5(2) intercombination lines for Si-like Rh have been investigated using the techniques of beam-foil spectroscopy. Two lines have been identified as belonging to these transitions having, however, different wavelengths from what would be expected based on published iso-electronic trends. The identifications suggested here are strengthened by requirements on (a) the known fine structure splitting in the ground configuration, (b) an intensity ratio based on branching ratios, (c) similar decay characteristics and (d) expected behaviour of the lines as a function of the ion beam energy. (C) 2003 Elsevier Science B.V. All rights reserved.
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| 9. |
- Hutton, Roger, et al.
(författare)
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EBIT spectroscopy of Pm-like tungsten
- 2003
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Ingår i: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 205, s. 114-118
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Tidskriftsartikel (refereegranskat)abstract
- Methods of VUV electron beam ion trap (EBIT) spectroscopy are applied to the study of Pm-like tungsten (W13+). These data show that theory appears well capable of dealing with these multi-electron (61) ions, at least for high ionization stages. A comparison of other spectroscopic methods applied to the study of other ions of the Pm I sequence is also given, and finally a search for the Pm-like W lines at the ASDEX Upgrade Tokamak is mentioned. (C) 2003 Elsevier Science B.V. All rights reserved.
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| 10. |
- Kester, O., et al.
(författare)
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Accelerated radioactive beams from REX-ISOLDE
- 2003
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Ingår i: Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms. - 0168-583X. ; 204, s. 20-20
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Konferensbidrag (refereegranskat)abstract
- In 2001 the linear accelerator of the Radioactive beam EXperiment (REX-ISOLDE) delivered for the first time accelerated radioactive ion beams, at a beam energy of 2 MeV/u. REX-ISOLDE uses the method of charge-state breeding, in order to enhance the charge state of the ions before injection into the LINAC. Radioactive singly-charged ions from the on-line mass separator ISOLDE are first accumulated in a Penning trap, then charge bred to an A/q
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