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  • 1
    Electronic Resource
    Electronic Resource
    Thermal decomposition of tetraethoxysilane (TEOS) on Si(111)-(7×7) (1998)
    Springer
    Applied physics 66 (1998), S. 1021-1024 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.35.Bs; 68.35.Dv; 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: 2 formation by chemical vapor deposition, on Si(111)-(7×7). Annealing after predominantly dissociative adsorption at room temperature, where triethoxysiloxane and ethyl groups are the main adsorbate species, leads to further decomposition with various products evolving, including diethoxysiloxane and further ethyl groups. This goes along with structural changes on the (7×7) reconstructed surface. A characteristic new structural element, with a maximum on interstitial sites, is interpreted as the very beginning of surface oxide formation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 2
    Electronic Resource
    Electronic Resource
    Multiphonon He atom scattering from Xe overlayers on Cu(111) and Cu(001) surfaces (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 9922-9929 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied the scattering of He atoms from ordered monolayers of Xe atoms adsorbed on Cu(111) and Cu(001) surfaces. Both Xe overlayers, the commensurate ((square root of)3×(square root of)3)R30° on Cu(111) at substrate temperature above 47 K and the incommensurate one on Cu(001), exhibit weak diffraction. On both surfaces the Xe overlayers sustain Einstein-like, vertically polarized Xe vibrations which can be multiply excited and annihilated even at low He atom incident energies and substrate temperatures. In spite of the anharmonic Xe-substrate potentials, the energies of multiphonon excitations are not found to exhibit any noticeable anharmonic shifts in either system. The results of the measurements are compared to theoretical energy and lateral momentum resolved scattering distributions, which were calculated by using the recently developed formalism for treating multiphonon scattering in the collision regimes, in which both the motion of the scattered particle and surface vibrations must be treated quantum mechanically. We can interpret the multiphonon scattering spectra and obtain good agreement with experiments by assuming linear He atom–phonon coupling, delocalized phonons in Xe adlayers, and by employing the one-phonon interaction parameters determined from the He–Xe interaction potentials. Effects of the quantum recoil on the motion of the scattered He atom, which give rise to a difference between phonon emission and absorption probabilities, and thereby non-Poissonian scattering distributions, were assessed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473839
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  • 3
    Electronic Resource
    Electronic Resource
    Adsorption of PF3 on Cu(001): Ordered overlayer structures and frustrated translational modes (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 5337-5345 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adsorption of PF3 on Cu(001) was studied by means of high resolution helium atom scattering (HAS) and SPALEED. PF3 adsorbs at surface temperatures below 210 K and forms a lattice gas at exposures less than 0.8 L. Saturation is reached for exposures greater than 3 L. At these coverages PF3 forms an ordered c(4×2) layer for surface temperatures above 145 K. For temperatures below 145 K an incommensurate, hexagonal PF3 layer was observed that necessarily excludes uniquely on-top site PF3 molecule to surface coordination. A new vibrational mode in the thermal energy regime corresponding to the frustrated translation parallel to the surface was identified; the energies of excitation were 3.3 meV and 3.5 meV, respectively, for the isolated molecules and the c(4×2) structure. No dispersion of the frustrated translation in the ordered c(4×2) phase was found. The results are discussed in terms of adsorbate–adsorbate and adsorbate–substrate interactions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478428
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  • 4
    Electronic Resource
    Electronic Resource
    Vibrational overtones in the electronic ground state of the benzene-Ar complex: A combined experimental and theoretical analysis (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 8408-8417 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using the recently developed method of coherent ion dip spectroscopy (CIS), we were able to measure rotationally resolved spectra of high lying overtones of the intermolecular van der Waals vibrations of the benzene-Ar complex. Optimized pulse sequences for the CIS experiment were obtained by numerical calculations of the population dynamics in the coherently excited few-level system. Due to the high resolution achieved in this experiment, the small isotope shifts upon deuteration of the benzene molecule could be measured and compared with the simple classical harmonic oscillator and with anharmonic three-dimensional quantum calculations. By comparing the latter calculations with the results of the CIS experiments, we tested the quality of several benzene-Ar interaction potentials. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476268
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  • 5
    Electronic Resource
    Electronic Resource
    The frustrated translational mode of CO on Cu(110): Azimuthal anisotropy studied by helium atom scattering—A comparison with time-of-flight electron stimulated desorption of ion angular distribution measurements (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 5161-5164 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The frustrated translation of isolated CO molecules parallel to the surface, or T mode, has been studied on a Cu(110) substrate using helium atom scattering. A small but significant anisotropy in T-mode vibrational frequencies was found for the on-top site species with oscillator frequencies of 3.6 and 3.2 meV along the [11¯0] and the [001] directions, respectively. These results are compared with recent results from time-of-flight electron stimulated desorption of ion angular distribution measurements [Ahner et al., Phys. Rev. Lett. 79, 1889 (1997)], where also a significant anisotropy has been observed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476311
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  • 6
    Electronic Resource
    Electronic Resource
    CO overlayers on Ru(0001) studied by helium atom scattering: Structure, dynamics, and the influence of coadsorbed H and O (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 8262-8273 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Ordered phases of CO on a Ru(0001) surface have been characterized with regard to structural and dynamical properties using high resolution helium atom scattering. In the energy regime below 10 meV a vibrational mode corresponding to a frustrated translation parallel to the surface (FTx) could be identified, the energy amounts to 5.9 meV for isolated CO molecules and to 5.75 meV for the ((square root of 3)×(square root of 3))R30°CO structure. The formation of the more compressed (2(square root of 3)×2(square root of 3))R30°CO and (5(square root of 3)×5(square root of 3))R30°CO structures is accompanied by significant changes of the low energy external vibrations, in pronounced contrast to the gradual frequency increase of the CO internal ν1-vibration. Coadsorption of hydrogen or oxygen was found to result in substantially larger FTx energies. Implications of these findings on the character of the molecule-surface interaction will be discussed, as well as the connection between the FTx-dispersion and the strength and type of the adsorbate-adsorbate interaction. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473828
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  • 7
    Electronic Resource
    Electronic Resource
    Micrometer-sized nozzles and skimmers for the production of supersonic He atom beams (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 3001-3009 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Micrometer-sized nozzles and skimmers made from drawn glass tubes are described and tested for the production of highly monoenergetic He atom beams. Glass nozzles with diameters between 1 μm and 4 μm when operated at He source stagnation pressures of up to 1000 atm provide intense beams with measured speed ratios of S=50–100, in good agreement with the predicted behavior scaled from nozzles with larger openings. Miniature glass skimmers with diameters as small as 3 μm were also successfully tested with conventional 10 μm diameter nozzles. These miniature nozzle-beam sources can be used to greatly reduce the size of present-day He-atom surface-scattering time-of-flight spectrometers and to reduce the number of vacuum stages and the size of vacuum pumps. They also open up new experimental possibilities as illustrated by measurements of the spatial profiles of seeded nozzle beams. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148233
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  • 8
    Electronic Resource
    Electronic Resource
    Freezing in forced convection flows inside ducts: A review (1997)
    Springer
    Heat and mass transfer 32 (1997), S. 341-351 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Zusammenfassung Die vorliegende Arbeit gibt einen Überblick über aktuelle Forschungsentwicklungen auf dem Gebiet des Gefrierens in durchströmten Kanälen. Der Schwerpunkt wird auf die grundsätzlichen Aspekte gelegt, die sowohl bei den beobachteten Gefriervorgängen selbst, als auch bei deren analytischer oder numerischer Modellierung von Bedeutung sind. Der Artikel befaßt sich mit Gefriervorgängen in Rohren, zwischen parallelen Platten, gekrümmten, rechteckigen Kanälen und divergenten, rechteckigen Kanälen. Darüberhinaus werden einige aktuelle Ergebnisse beim Erstarren von Wasser in Kanalströmungen aus den laufenden Forschungsarbeiten in Darmstadt vorgestellt.
    Notes: Abstract The present work gives an overview about the recent developments in research on freezing phenomena in forced convection flows inside ducts. Emphasis is given to the fundamental aspects of the phenomena observed in the solidification processes as well as on the analytical and numerical modelling aspects for this kind of problems. The paper deals with solidification problems inside tubes, parallel plate channels, curved rectangular channels and in diverging rectangular channels. Additionally, some new experimental and numerical results on solidification in duct flows are shown from the current research program in Darmstadt on freezing phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002310050131
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  • 9
    Electronic Resource
    Electronic Resource
    Dichroism in angular resolved VUV-photoemission from the (0001) surfaces of thin Gd and Nd films epitaxially grown on W(110) (1999)
    Springer
    The European physical journal 11 (1999), S. 161-175 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 79.60.-i Photoemission and photoelectron spectra - 78.66.-w Optical properties of specific thin films, surfaces, and low-dimensional structures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present investigations of the electronic and magnetic structure of the Rare Earth valence states. In particular, we have examined ultra thin films of the rare earth metals gadolinium and neodymium epitaxially grown on tungsten (110). Various experiments on dichroism in angular resolved photoemission have been performed using circularly as well as linearly polarised light in the VUV-range with photon energies below 40 eV. A special emphasis was placed on the investigation of the surface state, which was observed for both Gd and Nd. A very small magnetic splitting of about 25 meV was observed for the surface state of ferromagnetic Gd. A magnetic ordering of a Nd-monolayer on a remanently magnetised Fe-film is observed. Large dichroism effects are found for the surface state as well as the valence bands of paramagnetic Nd. In the latter case, these are used to determine the dispersion of the valence bands. Different numerical approaches are presented, one based on atomic photoionisation theory, another is based on a one-step model of solid state photoemission. Atomic photoionisation theory is used together with three-step calculations to explain the non-magnetic circular dichroism observed in the Gd 4f emission. The capability of dichroism experiments for resolving details of the electronic structure and for sensitive tests of photoemission calculations is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050926
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  • 10
    Electronic Resource
    Electronic Resource
    Observation of magnetic splitting in XPS MnL-spectra of Co MnSn and Pd MnSn Heusler alloys (1998)
    Springer
    The European physical journal 2 (1998), S. 1-3 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 71.20.Be Transition metals and alloys - 75.20.Hr Local moments in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The XPS MnL-spectra of Co2MnSn, a nearly half-metallic ferromagnet (HMF) and Pd2MnSn were investigated. The most drastical feature of the spectra observed is the well-defined magnetic splitting of the Mn 2p 3/2 , 2p 1/2 lines. This gives direct evidence of the existence of well-defined local magnetic moments in Heusler alloys in comparison with other itinerant-electron ferromagnets. The calculations of Mn2p XPS spectra of these materials were carried out using a fully relativistic generalization of the one-step model of photoemission and show excellent agreement with experiment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050218
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