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  • 1
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    Tuning the conductivity along atomic chains by selective chemisorption (2017)
    American Physical Society (APS)
    Details
    Publication Date: 2017-03-08
    Description: Author(s): F. Edler, I. Miccoli, J. P. Stöckmann, H. Pfnür, C. Braun, S. Neufeld, S. Sanna, W. G. Schmidt, and C. Tegenkamp Adsorption of Au on vicinal Si(111) surfaces results in growth of long-range ordered metallic quantum wires. In this paper, we utilized site-specific and selective adsorption of oxygen to modify chemically the transport via different channels in the systems Si(553)-Au and Si(557)-Au. They were analy… [Phys. Rev. B 95, 125409] Published Tue Mar 07, 2017
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
    Electronic Resource
    Electronic Resource
    Thermally activated processes in Li doped Ar matrices studied by electronic spin–lattice relaxation (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 7992-7999 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Optical absorption and ESR spectra were taken simultaneously of Li doped Ar matrices. The measurements showed that the broad absorption near the free atom D1, D2 transitions is in reality a superposition of two spectra, the so-called blue and red triplet, well known from other alkali rare gas systems. Both triplets could be correlated with corresponding ESR spectra. Longitudinal and transversal electronic relaxation times T1 and T2 were determined by carefully analyzing the saturation of the ESR signal amplitudes and the line broadening. The temperature dependence of T1 and T2 suggests that the relaxation is caused by thermally activated local structural changes with an extremely low activation enthalpy of the order of 1 meV. Similar results were obtained in K, Ag, and Au doped Ar matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462350
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  • 3
    Electronic Resource
    Electronic Resource
    Boron implantation doping of diamond (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 3658-3660 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin polarized 12B nuclei were produced in a 11B(d,p)12B nuclear reaction and recoil implanted into a type Ib diamond sample at doses below 1011 cm−2. β-radiation detected nuclear magnetic resonance spectra were measured directly after implantation at sample temperatures ranging from 300 to 800 K. The polarization asymmetry at the Larmor resonance yielded fractions of boron ions at sites of full tetrahedral symmetry of 12(1)% at 300 K, increasing to 17(2)% at 800 K. It is argued that these boron atoms are incorporated substitutionally by direct replacement collisions during the implantation process. The resonance spectra also showed additional boron at low-symmetry sites. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120472
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  • 4
    Electronic Resource
    Electronic Resource
    Local structure of implanted B in amorphous Si (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 338-340 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: 12B probe nuclei are implanted in amorphous Si and monitored by β-radiation-detected nuclear magnetic resonance (β-NMR). Independently of growth conditions and impurity content, we find the same frequency distribution in a variety of samples. This is interpreted as an intrinsic signature of the amorphous environment while preferential B–H pairing is not observed. Comparing our data with earlier 11B-NMR work, we find the local B configuration to be completely controlled by the incorporation process. In our low-dose implantation experiment, all B is fourfold coordinated and electrically active. This is in contrast to gas-phase doping or high-dose implantation where the threefold coordination prevails. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1384482
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  • 5
    Electronic Resource
    Electronic Resource
    Correlation of electron spin resonance and optical absorption of K atoms in solid Ar (1987)
    Springer
    The European physical journal 67 (1987), S. 531-539 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron spin resonance (ESR) and optical absorption spectra of K atoms embedded in Ar matrices have been measured simultaneously. ESR and optical spectra could be correlated comparing the effects of annealing and light induced site modifications. Electron spin relaxation times were estimated by saturation measurements. A large variety of ESR spectra was found which could be arranged into four groups according to their A and g factor matrix shifts. Two of these groups could be correlated with optical absorptions namely with the so-called red and blue triplet bands. The other two groups belong to K-(H2O)n complexes. Part of the absorption disappeared irreversibly upon annealing at about 12 K. There is considerable experimental evidence that this annealing process indicates the transition from an amorphous to a microcrystalline structure at about 12 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01304125
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  • 6
    Electronic Resource
    Electronic Resource
    Multiple quantum NMR transitions of8Li (T 1/2=0.84 s) in single crystals and powders of LiTaO3, and the quadrupole moment of8Li (1977)
    Springer
    The European physical journal 282 (1977), S. 243-248 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Multiple quantum nuclear magnetic resonance (NMR) transitions were observed on polarized8Li nuclei, which were produced by capture of polarized neutrons in a single crystal of LiTaO3. The asymmetric8Liβ-radiation distribution was used for the detection of NMR. A quadrupole moment ratio ¦Q(8Li)/Q(7Li)¦=0.78(1) was determined. Saturation of multiple quantum transitions in nuclear radiation detected NMR may lead to a reduction in measuring time of up to two orders of magnitude, as compared to single quantum detection methods. The measured spectra agree well with an exact lineshape calculation. The same measurements were also performed on a LiTaO3 powder sample. This was done to test a method to obtain quadrupole coupling constants from high field NMR multiple quantum powder patterns, which are easily detectable, also for higher nuclear spins. This latter method may be applicable also to conventional NMR detection techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01414890
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  • 7
    Electronic Resource
    Electronic Resource
    Sign of nuclear electric quadrupole coupling constants in solids fromγ-ray anisotropy measurements after capture of polarized neutrons (1976)
    Springer
    The European physical journal 25 (1976), S. 363-368 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract An experimental method is presented which allows the determination of the sign of nuclear electric quadrupole interactions in solids. Activated target nuclei with a purely dipolar spin polarization are produced by capture of polarized thermal neutrons. The quadrupole coupling of the nuclei to the electric field gradient tensor in the target crystal converts this (dipolar) polarization partly into a (quadrupolar) alignment, which can be measured by the anisotropy of theγ-ray emission in a succeeding nuclear transition. The sign of the alignment created in this reorientation process depends on the sign of the electric quadrupole interaction. The reorientation effect can be enhanced by selective induction of nuclear magnetic resonance transitions. The method has been applied to measure the sign of the crystal electric field gradient (efg) in tetragonal MgF2. Further, the sign of an efg in cubic CaF2 originating from a19F interstitial adjacent to the activated20F probe nucleus has been determined. The method is in principle applicable to a considerable number of nuclides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01315252
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  • 8
    Electronic Resource
    Electronic Resource
    Cross-relaxation processes of polarizedβ-active nuclei in various crystalline solids (1980)
    Springer
    The European physical journal 37 (1980), S. 151-161 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Cross-processes of neutron activated, polarized nucleiI with surrounding stable host nucleiS are observed in diverse solids, using an in-beam NMR technique where the polarizedI nuclei are produced by capture of polarized thermal neutrons. The polarization is determined by measuring the 0°–180° asymmetry of theβ-decay radiation of these nuclei. The following cross-processes are studied:8Li−6Li innatLi metal;8Li−7Li in7Li metal;8Li−6Li innatLiF (single crystal);8Li−93Nb in7LiNbO3 (single crystal);20F−19F in MgF2 (single crystal). Two applications are presented: a) Determination of the temperature dependence of the electrical quadrupole coupling constant of93Nb in LiNbO3; b) Observation of radiation induced point defects in MgF2 and their thermal annealing. All measurements are performed without any radiofrequency irradiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01365371
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  • 9
    Electronic Resource
    Electronic Resource
    Structure and annealing of (n, γ)-Induced point defects in CaF2 (1978)
    Springer
    The European physical journal 30 (1978), S. 19-27 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Neutron activated20F nuclei (T 1/2=11 s) in CaF2 serve for two purposes: first they produce well defined point defects by their (n, γ)-production mechanism, second, they act as probes to detect the properties of these defects in aβ- andγ-ray detected nuclear magnetic resonance experiment. Below about 70 K an interstitial defect is observed due to a quadrupolar splitting of the20F-NMR line. The defect induced electric field gradient is oriented along the 〈111〉-axis of the crystal and causes a quadrupole coupling constante 2 qQ/h=−2.0(1) MHz at the20F site. The defect anneals above 70 K with an Arrhenius like temperature dependence corresponding to an activation energyE M =0.17(4) eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323665
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  • 10
    Electronic Resource
    Electronic Resource
    Der infizierte arterielle Stent (1998)
    Springer
    Der Chirurg 69 (1998), S. 872-876 
    Details
    ISSN: 1433-0385
    Keywords: Key words: PTA ; Arterial stenting ; Bacterial arteritis ; Septic embolization ; Staphylococcus aureus. ; Schlüsselwörter: Percutane Angioplastie ; arterielle Stentimplantation ; bakterielle Arteriitis ; septische Embolisierung ; Staphylococcus aureus.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung. Gefäßinfektionen nach percutanen endovasculären Maßnahmen sind selten. Wir berichten von einer bakteriellen Arteriitis nach PTA und Stentimplantation in eine Iliacalarterie mit konsekutiver septischer Embolisierung, ipsilateralem Kniegelenkempyem und Ausbildung eines infizierten Aneurysma spuriums. Als Ursache muß eine Kontamination des Stents mit Staphylococcus aureus angenommen werden. Die Behandlung bestand in der Resektion des entzündeten Gefäßabschnittes mit Stententfernung und autologer Rekonstruktion.
    Notes: Summary. Vascular infections after percutaneous endovascular procedures are rare. We report a case of bacterial arteritis following PTA and stent implantation into an iliac artery. It was complicated by septic embolization, ipsilateral empyema of the knee joint and formation of an infected false aneurysm. Contamination of the stent with Staphylococcus aureus is likely to be the cause. The treatment included resection of the infected arterial segment, removal of the stent, and autologous reconstruction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001040050504
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