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  • 1
    Electronic Resource
    Electronic Resource
    Investigation of Ion-Implanted Boron in Diamond (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 258-263 (Dec. 1997), p. 763-768 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/03/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.258-263.763.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Laser nitriding of iron: Influence of the laser parameters on the nitriding efficiency (1996)
    Springer
    Applied physics 62 (1996), S. 231-236 
    Details
    ISSN: 1432-0630
    Keywords: PACS61.80.Ba; 52.75.-d; 81.60.Bn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Laser nitriding of Armco iron in nitrogen was studied for KrF-excimer-laser irradiation. The influence of the energy density and number of pulses on the nitrogen take-up and the nitride phases formed was investigated using Resonant Nuclear Reaction Analysis (RNRA) and Mössbauer spectroscopy. Besides the original $\alpha$ -iron, austenite $\gamma$ -Fe(N), martensite $\alpha'$ -Fe(N), $\varepsilon$ -Fe $_{2+x}$ N, and $\alpha''$ -Fe $_{16}$ N $_2$ , were identified. The fraction of the $\varepsilon$ -phase was found to increase with the number of pulses and the energy density. A threshold energy density of 1.8(2) J/cm $^2$ for the laser nitriding process was found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575086
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  • 3
    Electronic Resource
    Electronic Resource
    Ion beam mixing of Pt marker layers in Al (1996)
    Springer
    Applied physics 63 (1996), S. 31-36 
    Details
    ISSN: 1432-0630
    Keywords: PACS61.80.Jh; 68.55.Ln
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. We have studied the ion beam mixing of Pt marker layers which were 1 nm thick and buried 55 nm deep in Al. The samples were irradiated with Ne, Ar, Kr, Xe, and Pb ions with ion energies ranging from 75 to 600 keV and damage energy densities from 0.17 to 2.0 keV/nm. The depth distributions of both the implanted ions and the marker atoms were measured with Rutherford backscattering spectrometry. The experimental mixing efficiency of $\eta = 0.856(24)$ nm $^5$ /keV is about ten times as high as was to be expected from the ballistic model and the local spike models. We suggest a connection between this unexpectedly high mixing efficiency and the vanishing primary solid solubility of the marker element in the host matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01579743
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  • 4
    Electronic Resource
    Electronic Resource
    Laser nitriding of iron: Nitrogen profiles and phases (1995)
    Springer
    Applied physics 61 (1995), S. 1-5 
    Details
    ISSN: 1432-0630
    Keywords: PACS61.80.Ba; 52.75. $-$d; 81.60.Bn; 76.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA) and the phase formation determined by Conversion Electron Mössbauer Spectroscopy (CEMS) were investigated as functions of energy density and the number of pulses. The nitrogen content of the samples was found to be independent of the number of pulses in a layer of 50 nm from the surface and to increase in depths exceeding 150 nm. The phase composition did not change with the number of pulses. The nitrogen content can be related to an enhanced nitrogen solubility based on high temperatures and high pressures due to the laser-induced plasma above the sample. With increasing pulse energy density, the phase composition changes towards phases with higher nitrogen contents. Nitrogen diffusion seems to be the limiting factor for the nitriding process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01538202
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic moment measurements in the semi-magic nuclei 94Ru and 95Rh after recoil implantation into iron and nickel (1999)
    Springer
    The European physical journal 6 (1999), S. 29-36 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 21.10.Ky Electromagnetic moments – 21.60.Cs Shell models – 21.60.+j 90 〈 A 〈 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The magnetic moments of the 12+ and 11− yrast states in 94Ru and of the 25/2−, 29/2+, and 35/2+ levels in 95Rh have been measured via the IMPAD technique. The nuclei were produced in the reaction 58Ni +40Ca and recoil-implanted into polarized Ni and Fe hosts. The g-factors were deduced from the measured time-integral Larmor precessions. The comparison between the experimental results and large-scale shell model calculations suggests that the 12+ and 11− states in 94Ru and the 25/2− level in 95Rh are pure proton states whereas the 29/2+ and 35/2+ states in 95Rh contain a neutron excitation across the N=50 shell gap. This interpretation supports the conclusion drawn from recent lifetime measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050313
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  • 6
    Electronic Resource
    Electronic Resource
    Coincidence Doppler shift lifetime measurements in 73,74Se and 74Br using the EUROBALL Cluster cube array (1999)
    Springer
    The European physical journal 6 (1999), S. 257-268 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 23.20.Js Multipole matrix elements – 23.20.Lv Gamma transitions and level energies – 24.60.Dr Statistical compound-nucleus reactions – 27.50.+e 59 〈 A 〈 89
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Subpicosecond lifetimes of high spin states in the rotational nuclei 73Se, 74Se and 74Br have been measured using the 58Ni +19F compound reaction and the Doppler Shift Attenuation method. Six EUROBALL Cluster detectors arranged in cube geometry allowed us to select the relevant transitions in γγ coincidence mode. The high counting statistics achieved in this setup also facilitated the determination of average sidefeeding times, which were found to agree rather well with the results of Monte-Carlo calculations of the particle and γ-ray evaporation process. The deduced quadrupole strengths and deformations are compared with the results of previous measurements and the predictions of Cranked Shell Model calculations. In 74Br, a large and constant prolate deformation of β2= 0.37(1) was found for the presumed 4+ and 3− two-quasiparticle bands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050344
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  • 7
    Electronic Resource
    Electronic Resource
    Lifetime study of high-spin states in 104,105In (1998)
    Springer
    The European physical journal 3 (1998), S. 115-128 
    Details
    ISSN: 1434-601X
    Keywords: PACS:21.10.Tg Lifetimes – 21.60.Cs Shell model – 23.20.Lv Gamma transitions and level energies – 27.60.+j 90 ≤ A ≤ 149
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In the neutron deficient isotopes 104,105In lifetimes of high spin states in the range from 0.5 ps to 600 ps have been measured in a coincidence recoil distance Doppler shift (RDDS) experiment. By combining the Doppler shift attenuation (DSA) and RDDS methods at few μm flight distances, the problem of delayed feeding has been avoided and very short lifetimes in the range 0.5–0.8 ps have been determined. Shell model calculations with strong restrictions for the neutron orbitals reveal good agreement with experimental level energies and still fair agreement for most measured B(M1) and B(E2) values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050157
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  • 8
    Electronic Resource
    Electronic Resource
    Ion-induced phase transition in the Au–In system (1999)
    Springer
    Hyperfine interactions 120-121 (1999), S. 337-340 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Au–In equilibrium phase diagram exhibits a large number of intermetallic phases which have recently been explored via perturbed angular correlation spectroscopy, using alloyed and/or diffused 111In probes. In the present work we report on the phase transition from Au7In3 (hexagonal, γ'-phase) to Au9In4 (γ-brass phase) induced via Xe- or Ar-ion implantations at 80 K. We compare the hyperfine parameters with those obtained in thermal equilibrium and after quenching, and argue that ion beam mixing and fast cooling in the condensation phase of thermal (local) spikes are the predominant mechanisms to interpret our findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017060431118
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  • 9
    Electronic Resource
    Electronic Resource
    PAC measurements of the Verwey transition in magnetite (1999)
    Springer
    Hyperfine interactions 120-121 (1999), S. 237-241 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Perturbed angular correlation (PAC) experiments with implanted 111In tracers have recently been used to investigate magnetic phase transitions in metal oxides. Here we report on PAC measurements for 111Cd in polycrystalline Fe3O4 in the neighborhood of the Verwey phase transition (TV≈ 120 K). Perturbed angular correlation spectra were taken for implanted 111In probes at temperatures between 9 and 850 K. The two observed Larmor frequencies are attributed to the two possible cation sites in the cubic inverse spinel lattice. For T 〉 120 K, the temperature dependence of both Larmor frequencies follows a Curie–Weiss power law ωL(T)/ ωL(0)=(1-T/TN)β, with the parameters TN=848(2) K and β= 0.392(2). At the Verwey temperature we find a rapid change of both Larmor frequencies, with ωL1 increasing from 178(2) MHz at 120 K to 191(4) MHz at 100 K, and ωL2 decreasing from 173(4) MHz to 151(5) MHz. The Verwey transition also affects the widths of the frequency distributions, which more or less double below TV. This possibly indicates the presence of several components with Larmor frequencies similar to those found in the previous Mössbauer data, or for electronic after-effects correlated with the semiconductivity of magnetite below TV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017023322941
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  • 10
    Electronic Resource
    Electronic Resource
    The size of thermal spikes in xenon-irradiated Ag/Fe bilayers (1999)
    Springer
    Hyperfine interactions 120-121 (1999), S. 331-335 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ag/Fe bilayers in which a submonolayer of 111In had been deposited in the Fe layer at a distance of x=0–17 nm from the interface, were irradiated at 80 K with 450 keV Xe ions to a fluence of 3 and 6⋅ 1015 ions/cm2. Perturbed Angular Correlation spectroscopy was used to monitor the microsurrounding of the 111In tracers and to identify the radiation-induced defects. The fraction of tracer atoms being transported into the Ag layer cannot be explained by ballistic mixing, but is reproduced when assuming local thermal spikes to develop. The diffusion of 111In into the Ag layer can be modeled if the local spikes have an average diameter of some 5 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017008414280
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