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  • 1
    Electronic Resource
    Electronic Resource
    Interaction of atomic hydrogen with the graphite single-crystal surface (1992)
    Springer
    Applied physics 55 (1992), S. 489-492 
    Details
    ISSN: 1432-0630
    Keywords: 79.60.−i ; 82.65.−i
    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 chemisorption of atomic hydrogen on the basal plane of natural graphite single crystals. LEED and angle-resolved photoemission were used to characterize the clean surface. The adsorption of H saturates at rather low exposures, accompanied by a decrease of the work function by Δφ=(100±20) meV. The photoemission spectra indicate a clear carbon-hydrogen interaction, leading to shifts of substrate bands by up to about 200 meV. No detectable etching of the surface occurs at room temperature, in agreement with earlier work. Our results are qualitatively consistent with theoretical considerations about a strong H(1s)-C(2p z) chemical bond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348338
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chemisorption of halogens on silver a critical comparison of results from photqemission and thermal desorption spectroscopy (1989)
    Springer
    Applied physics 49 (1989), S. 313-320 
    Details
    ISSN: 1432-0630
    Keywords: 79.60.−i ; 82.65.My
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Conflicting thermal desorption (TDS) results from submonolayer coverages of atomic Cl, Br or I on Ag(100), Ag(110) or Ag(111) stimulated us to check for the possible influence of different sample preparation procedures. We present experimental evidence, that a combined approach using TDS and angle-resolved ultraviolet photoemission may help to distinguish between “better” and “worse” surface preparation. We present detailed new results for the Cl/Ag(110) system. From our observations we conclude that all three halogens listed above give one and only one TDS peak in the submonolayer regime and show very similar adsorption/desorption-characteristics. This fact removes the apparent contradictions reported in the literature and demonstrates that the halogen-Ag bond is not very sensitive to the surface crystallography.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616860
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    UV-photoelectron spectroscopy with lateral resolution (1991)
    Springer
    Applied physics 53 (1991), S. 410-413 
    Details
    ISSN: 1432-0630
    Keywords: 79.60.−i
    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 built and tested a novel type of scanning photoemission microscope. The instrument uses ultraviolet emission lines at photon energies of 16.8 eV (Ne I), 21.2 eV (He I) and 40.8 eV (He II). The radiation is focused into a spot of about 2 μm diameter on the specimen surface by means of an ellipsoidal mirror. The emitted photoelectrons are recorded in normal emission geometry by a standard electron energy analyzer. Two modes of operation are possible: spatially resolved electron energy distribution curves may be recorded from a fixed point on the sample. As the specimen is scanned piezo-mechanically in two dimensions across the beam, images within a fixed electron energy bandwith may be formed. We report on the realization and performance of the new microscope.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348153
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    CSF pulsation patterns in occlusive hydrocephalus (1994)
    Springer
    European radiology 4 (1994), S. 133-141 
    Details
    ISSN: 1432-1084
    Keywords: CSF flow ; Hydrocephalus ; MRI
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fifteen patients with solid and cystic occlusions of the cerebrospinal fluid (CSF) circulation pathways were examined with MRI using an ECG retrogated two-dimensional FISP sequence to determine whether there are certain defined pathological CSF flow patterns in these patients. All patients were clinically still compensated. The results of the measurements of CSF flow velocities at different locations in the CSF system were compared with the results from 8 healthy volunteers. In all patients with occlusive processes of the intraventricular CSF pathways (4 aqueduct stenoses, 1 membranous occlusion of the fourth ventricular outlets, 1 solid tumour at the foramen of Monro and 1 solid fourth ventricular tumour) we observed hyperdynamic CSF pulsation above the lesion. This was transmitted into the spinal canal. Close by a solid occlusion within the aqueduct the flow velocity curve over the RR cycle was typically shifted, resulting in a mirroring of the flow velocity curve compared with normals. In cystic lesions (n = 4) there was transmission of the pulsation wave through the lesion and therefore no mirroring of the flow velocity curve. This technique allows very good delineation of cystic structures in the peripineal region (n = 4), also due to the opposite direction of flow within the cyst compared with the surrounding CSF spaces, depending on the extent of communication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231199
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    MR imaging and MR angiography in preoperative evaluation of intracranial meningiomas (1994)
    Springer
    European radiology 4 (1994), S. 538-544 
    Details
    ISSN: 1432-1084
    Keywords: MRI ; MRA ; Meningiomas ; Arterial displacement ; Tumor-feeding vessels
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A group of 41 patients with intracranial meningiomas were examined by MR imaging (MRI) and MR angiography (MRA) to assess the. clinical value of MRA in the preoperative evaluation of these patients. The results of MRA were compared with the results of intraarterial cerebral catheter X-ray angiography (XRA; n = 19) and with the operative findings (n = 41 ): Our results showed a good correlation between MRA and XRA/surgery in demonstrating the relationship between the tumor and adjacent venous and arterial structures. Use of MRA was also helpful in demonstrating the degree of intrinsic tumor vascularity. It also supplied important information for operative planning Adjunct XRA was mandatory if detailed information about tumor-feeding vessels was requested by the neurosurgeon, especially in highly vascularized angiomatous meningiomas and in meningiomas suspected of tumor feeding by vessels of the internal carotid artery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00226826
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    Paper (German National Licenses)
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