Search Results - (Author, Cooperation:H. Bluhm)
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1Latest Papers from Table of Contents or Articles in PressM. D. Shulman ; O. E. Dial ; S. P. Harvey ; H. Bluhm ; V. Umansky ; A. Yacoby
American Association for the Advancement of Science (AAAS)
Published 2012Staff ViewPublication Date: 2012-04-14Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
2Latest Papers from Table of Contents or Articles in PressB. Eren ; D. Zherebetskyy ; L. L. Patera ; C. H. Wu ; H. Bluhm ; C. Africh ; L. W. Wang ; G. A. Somorjai ; M. Salmeron
American Association for the Advancement of Science (AAAS)
Published 2016Staff ViewPublication Date: 2016-01-30Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyComputer ScienceMedicineNatural Sciences in GeneralPhysicsPublished by: -
3Latest Papers from Table of Contents or Articles in PressSchreiber, L. R., Bluhm, H.
American Association for the Advancement of Science (AAAS)
Published 2018Staff ViewPublication Date: 2018-01-26Publisher: American Association for the Advancement of Science (AAAS)Print ISSN: 0036-8075Electronic ISSN: 1095-9203Topics: BiologyChemistry and PharmacologyGeosciencesComputer ScienceMedicineNatural Sciences in GeneralPhysicsKeywords: Physics, AppliedPublished by: -
4Articles: DFG German National LicensesKies, W. ; Decker, G. ; Mälzig, M. ; van Calker, C. ; Westheide, J. ; Ziethen, G. ; Bachmann, H. ; Baumung, K. ; Bluhm, H. ; Rusch, D. ; Ratajczak, W. ; Stoltz, O. ; Bayley, J. M.
[S.l.] : American Institute of Physics (AIP)
Published 1991Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: Pinch formation in fiber pinch experiments has been investigated in the lower terawatt regime. The main results are: (1) there are upper limits of breakdown voltage (∼700 kV) and current rise rate (∼20 kA/ns) beyond which leak discharges develop within the vacuum feed of the pulseline KALIF; (2) there is a lower limit of fiber radius (∼10 μm) below which pinch disruptions take place at a pinch current of (approximately-greater-than)300 kA; (3) the hot (Te≤1 keV) inhomogeneous pinch plasma develops typically 10 ns after local collapses (micropinches) at a pinch current (approximately-greater-than)400 kA and lives for more than 50 ns; (4) neutron emission (yield of CD2 fibers ∼1010) appears mostly isotropic; (5) all fiber pinches show global expansion with velocities reaching from typically 10 μm/ns (initial expansion) to (approximately-greater-than)100 μm/ns; and (6) the power requirements for the fiber ablation process are contradictory to those for the final pinch phase.Type of Medium: Electronic ResourceURL: -
5Articles: DFG German National LicensesBluhm, H. ; Lindner, J. ; Tiemann, E.
College Park, Md. : American Institute of Physics (AIP)
Published 1990Staff ViewISSN: 1089-7690Source: AIP Digital ArchiveTopics: PhysicsChemistry and PharmacologyNotes: Excitation spectra of NaI were recorded in the wavelength range 239–256 nm with a frequency doubled pulsed dye laser. The assignment of 27 vibrational bands shows that the observed spectra belong to a new bound covalent state below the atomic asymptotes Na(2P1/2,3/2) + I(2P3/2) and above the predissociating state A0+ [S. H. Schaefer, D. Bender, and E. Tiemann, Chem. Phys. 89, 65(1984)]. The Dunham parameters and the potential curve for the new state are given. The potential curve is compared with that derived by the analysis of a fluorescence progression from a broadband excitation that was published recently by Bower et al. [J. Chem. Phys. 89, 4478 (1988)].Type of Medium: Electronic ResourceURL: -
6Articles: DFG German National LicensesBluhm, H. ; Pan, S. H. ; Xu, L. ; Inoue, T. ; Ogletree, D. F. ; Salmeron, M.
[S.l.] : American Institute of Physics (AIP)
Published 1998Staff ViewISSN: 1089-7623Source: AIP Digital ArchiveTopics: PhysicsElectrical Engineering, Measurement and Control TechnologyNotes: We present the design of a scanning force microscope and vacuum chamber for the growth and imaging of ice films in thermodynamic equilibrium and under controlled super or undersaturation. The apparatus allows measurements in the temperature range from −60 to +80 °C in a controlled water vapor atmosphere. First results on the morphology and the frictional properties of thin ice films on mica cleavage faces are presented. The films are found to grow in a two-dimensional manner, often exhibiting dendritic growth shapes. The lateral force measured on ice is higher than that observed on the surrounding substrate. © 1998 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
7Articles: DFG German National LicensesBaumung, K. ; Karow, H. U. ; Rusch, D. ; Bluhm, H. J. ; Hoppé, P. ; Kanel, G. I. ; Utkin, A. V. ; Licht, V.
[S.l.] : American Institute of Physics (AIP)
Published 1994Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The hydrodynamic response of thin planar targets to the ablative pressure pulse induced by a high-power proton beam has been investigated experimentally at the Karlsruhe Light Ion Facility using time-resolved laser-Doppler velocimetry. An analytical acoustic model was established which allows a semiquantitative interpretation of the phenomena observed. Details in the measured ablation pressure history could be explained by the particularities of the proton beam. The evolution in time of the depth of the energy deposition zone deduced from our experiments is in good agreement with the proton energy and stopping range increase during the voltage rise of the generator pulse.Type of Medium: Electronic ResourceURL: -
8Articles: DFG German National LicensesLaqua, H. ; Bluhm, H. ; Buth, L. ; Hoppé, P.
[S.l.] : American Institute of Physics (AIP)
Published 1995Staff ViewISSN: 1089-7550Source: AIP Digital ArchiveTopics: PhysicsNotes: The properties of a proton source developed for use in a pulsed high power magnetically insulated ion diode have been determined. The source is created from a sliding gas discharge on the surface of a thin double layer of TiH and Pd deposited on an insulating substrate. By driving a short (〈20 ns) high current pulse through the metal films hydrogen is released from the Ti store and a multichannel electrical breakdown is created in the desorbed gas layer. The uniformity of this breakdown depends on the capacitance per area of the multilayer setup. It has been found that the breakdown always occurs after the same areal gas density has been released. The density as well as the temperature of the plasma depend on a continuous influx of hydrogen from the reservoir and on the expansion. The electron temperature decreased from up to 12 early in the pulse to less than 3 eV late in the pulse. Over a distance of 1 mm the plasma density falls from 1017 at the surface to 1015 cm−3. The plasma expansion is stopped by a strong magnetic field parallel to the surface; however, the neutral hydrogen density increased with increasing magnetic field. Carbon ions are the most important contaminant of the hydrogen plasma. However, their fraction is smaller than 10%. © 1995 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
9Articles: DFG German National LicensesBluhm, H. ; Wadas, A. ; Wiesendanger, R.
Woodbury, NY : American Institute of Physics (AIP)
Published 1997Staff ViewISSN: 1077-3118Source: AIP Digital ArchiveTopics: PhysicsNotes: Ferroelectric domains in LiNbO3 have been investigated by means of electrostatic force microscopy. Polarization-inverted gratings with 4 μm periodicity were fabricated by titanium diffusion into both +c and −c faces of single-domain LiNbO3 crystals. The distribution of the electric field in the vicinity of the sample surface was measured using scanning probe microscopy. The electrostatic force image was found to correlate with the shape of the domain-inverted profile observed by scanning electron and optical microscopies. © 1997 American Institute of Physics.Type of Medium: Electronic ResourceURL: -
10Articles: DFG German National LicensesStaff View
ISSN: 0016-8890Topics: German, Dutch and Scandinavian StudiesURL: -
11Articles: DFG German National LicensesStaff View
ISSN: 0022-2852Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
12Articles: DFG German National LicensesStaff View
ISSN: 0029-554XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Energy, Environment Protection, Nuclear Power EngineeringPhysicsType of Medium: Electronic ResourceURL: -
13Articles: DFG German National LicensesStaff View
ISSN: 0301-0104Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Chemistry and PharmacologyPhysicsType of Medium: Electronic ResourceURL: -
14Articles: DFG German National LicensesStaff View
ISSN: 0012-1045Topics: PhilosophyNotes: BEMERKUNGEN UND BERICHTEURL: -
15Articles: DFG German National LicensesStaff View
ISSN: 0029-554XSource: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002Topics: Energy, Environment Protection, Nuclear Power EngineeringPhysicsType of Medium: Electronic ResourceURL: -
16Articles: DFG German National LicensesStaff View
ISSN: 1432-0630Keywords: 61.16.Ch ; 62.20.-x ; 68.35.BsSource: Springer Online Journal Archives 1860-2000Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision MechanicsPhysicsNotes: Abstract The frictional properties of freshly cleaved (010) surfaces of the ferroelectric TriGlycine Sulfate (TGS) were investigated by combined scanning and friction force microscopy under ambient conditions. A frictional contrast could be observed between domains with different electrical polarity, as well as between terraces inside individual domains which are separated by steps of half of the unit-cell height or an odd multiple of this value. The latter contrast mechanism originates from the arrangement of the molecules at the surface which is chemically homogeneous, but structurally rotated by 180° between different terraces. The resulting asymmetric surface potential gives rise to a frictional anisotropy in different directions that can be detected by the force microscope, as well as to a change of the frictional force between forward and backward scan direction.Type of Medium: Electronic ResourceURL: -
17Articles: DFG German National LicensesStaff View
ISSN: 1432-0630Keywords: PACS: 61.16.Ch; 62.20.-x; 68.35.BsSource: Springer Online Journal Archives 1860-2000Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision MechanicsPhysicsNotes: Abstract. The frictional properties of freshly cleaved (010) surfaces of the ferroelectric TriGlycine Sulfate (TGS) were investigated by combined scanning and friction force microscopy under ambient conditions. A frictional contrast could be observed between domains with different electrical polarity, as well as between terraces inside individual domains which are separated by steps of half of the unit-cell height or an odd multiple of this value. The latter contrast mechanism originates from the arrangement of the molecules at the surface which is chemically homogeneous, but structurally rotated by 180° between different terraces. The resulting asymmetric surface potential gives rise to a frictional anisotropy in different directions that can be detected by the force microscope, as well as to a change of the frictional force between forward and backward scan direction.Type of Medium: Electronic ResourceURL: -
18Articles: DFG German National LicensesStaff View
ISSN: 1432-0630Keywords: 61.16 ; 68.65Source: Springer Online Journal Archives 1860-2000Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision MechanicsPhysicsNotes: Abstract We have investigated the influence of the native oxide layer on semiconductor surfaces on the imaging properties of the atomic force microscope operated under ambient conditions by using epitaxial In1−x Ga x As layers grown by Metal-Organic Chemical Vapour Deposition (MOCVD) on (001) oriented InP substrates which have been kept under ambient conditions for two years. The thickness and composition of the native oxide layers were studied with ellipsometry and X-ray photoelectron spectroscopy, respectively. Subsequently, the sample surfaces were imaged by means of atomic force microscopy operated in air which revealed terrace structures separated by monoatomic steps. The obtained data were compared with the surface morphology which can be expected from the MOCVD growth process. The results suggest that an accurate study of semiconductor layer growth by atomic force microscopy in air is possible.Type of Medium: Electronic ResourceURL: -
19Articles: DFG German National LicensesStaff View
ISSN: 1432-2099Source: Springer Online Journal Archives 1860-2000Topics: BiologyPhysicsNotes: Summary Changes in the membrane potential of cultured L-929 cells were investigated after irradiation with doses ranging from 5–200 Gy. Immediately after irradiation a depolarisation is observed that is followed by a damped oscillation of the membrane potential and finally by a rapprochement to the control value. Whereas the magnitude of depolarisation does not show any dependence on irradiation dose, the time required to reach the control value again increases with increasing dose. Up to 10 Gy, the period of the first half-oscillation rises rapidly to about 12 min, at higher doses a slow linear increase follows reaching a value of 23 min after 200 Gy.Type of Medium: Electronic ResourceURL: -
20Articles: DFG German National LicensesStaff View
ISSN: 0009-286XKeywords: Chemistry ; Industrial ChemistrySource: Wiley InterScience Backfile Collection 1832-2000Topics: Chemistry and PharmacologyProcess Engineering, Biotechnology, Nutrition TechnologyType of Medium: Electronic ResourceURL: