V. Fernandez

Universidad de Oviedo

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David Anseán

Universidad de Oviedo

M. González

Université de Sherbrooke

O. Schaff

Fritz Haber Institute of the Max Planck Society

D.P. Woodruff

University of Warwick

K.‐M. Schindler

Martin Luther University Halle-Wittenberg

J.C. Viera

Universidad de Oviedo

A. Theobald

Fritz Haber Institute of the Max Planck Society

A.M. Bradshaw

Max Planck Society

Philip Hofmann

Aarhus University

V. Fritzsche

Fritz Haber Institute of the Max Planck Society

Cooperative Institutions

Centre National de la Recherche Scientifique

Universidad de Oviedo

Institut des Matériaux Jean Rouxel

Fritz Haber Institute of the Max Planck Society

Nantes Université

Universidad Nacional Autónoma de México

Max Planck Society

University of Warwick

Université Paris-Sud

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

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Local Structure ofNH2onSi(100)−(2×1)and …

Physical Review Letters (1997)

N. Franco J. Ávila M. E. Dávila M. C. Asensio D.P. Woodruff

A scanned-energy mode photoelectron diffraction study of the $\mathrm{Si}(100)\ensuremath{-}(2\ifmmode\times\else\texttimes\fi{}1)$ surface with adsorbed $\mathrm{NH}{}_{2}$ provides quantitative determination of key structural parameters previously only predicted from theoretical calculations. In particular, the $\mathrm{N}$ atoms occupy off-atop sites at a dimerized surface Si atom with N-Si bond lengths of $1.73\ifmmode\pm\else\textpm\fi{}0.08\AA{}$ and bond angle relative to the surface normal of $21\ifmmode^\circ\else\textdegree\fi{}\ifmmode\pm\else\textpm\fi{}4\ifmmode^\circ\else\textdegree\fi{}$. The adsorption greatly reduces the Si dimer asymmetry relative to that of the clean surface.

10.1103/physrevlett.79.673

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Citations (52)

Structure determination of the(3×3)R30°

Physical review. B, Condensed matter (1999)

P. Baumgärtel J. J. Paggel M. Hasselblatt K. Horn V. Fernandez

A quantitative structural analysis of the system $\mathrm{Si}(111)(\sqrt{3}\ifmmode\times\else\texttimes\fi{}\sqrt{3})R30\ifmmode^\circ\else\textdegree\fi{}\ensuremath{-}\mathrm{B}$ has been performed using photoelectron diffraction in the scanned energy mode. We confirm that the substitutional ${S}_{5}$ adsorption site is occupied and show that the interatomic separations to the three nearest-neighbor Si atoms are $1.98(\ifmmode\pm\else\textpm\fi{}0.04) \mathrm{\AA{}}\mathrm{},$ $2.14(\ifmmode\pm\else\textpm\fi{}0.13) \mathrm{\AA{}}\mathrm{},$ and $2.21(\ifmmode\pm\else\textpm\fi{}0.12) \mathrm{\AA{}}\mathrm{}.$ These correspond to the silicon atom immediately below the boron atom, the adatom immediately above, and the three atoms to which it is coordinated symmetrically in the first layer.

10.1103/physrevb.59.13014

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Citations (30)

Surface segregation of photoresist copolymers containing polyhedral oligomeric silsesquioxanes studied by x-ray photoelectron spectroscopy

Journal of Vacuum Science & Technology B Microelectronics and Nanometer Structures Processing Measurement and Phenomena (2004)

David Eon G. Cartry V. Fernandez Christophe Cardinaud E. Tegou

Copolymers containing polyhedral oligomeric silsesquioxane (POSS) pendant groups and various acrylate type monomers are studied by x-ray photoelectron spectroscopy. These copolymers have potential application as bilayer resist material for next generation lithography. Two methods are used in order to characterize resist surfaces, angular resolved XPS and inelastic background signal quantification (Tougaard method). The existence of a surface layer rich in POSS is proven. About 1.5nm thick, this layer stands above a material with uniform POSS concentration. Evaluation of POSS concentration depth profiles shows that surface segregation depends on the polymer comonomers and on the silicon content.

Silsesquioxane

Photoresist

Surface layer

10.1116/1.1798871

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Citations (18)

Local structure determination for low-coverage CO on Ni(111)

Journal of Physics Condensed Matter (1996)

R. F. Davis D.P. Woodruff Philip Hofmann O. Schaff V. Fernandez

Scanned-energy-mode photoelectron diffraction has been used to determine the local adsorption structure of CO on Ni(111) at low temperature at a coverage of approximately 0.25 ML, corresponding to a nominal phase. CO molecules are found to occupy the same two (`hcp' and `fcc') inequivalent hollow sites as in the 0.5 ML phase, and while the results do indicate a preference for the hcp hollow site directly above a second-layer Ni atom in the low-coverage state, this preference is of marginal statistical significance. The similarity of this parameter in both the and phases can only be reconciled by assuming significant local disorder. It does, however, indicate that the local binding energies at the two hollow sites are very similar and that the presence of both sites in the phase is not simply a consequence of near-neighbour adsorbate - adsorbate repulsion.

10.1088/0953-8984/8/10/009

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Citations (32)

Structural and chemical stability of halide perovskites

Solid State Communications (1997)

Vı́ctor Luaña Aurora Costales Ángel Martín Pendás M. Flórez V. Fernandez

Quantum Chemistry

Quantum chemical

Chemical Stability

Crystal (programming language)

10.1016/s0038-1098(97)00154-3

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Citations (31)

Electric Vehicle Li-Ion Battery Evaluation Based on Internal Resistance Analysis

2021 IEEE Vehicle Power and Propulsion Conference (VPPC) (2014)

David Anseán M. González J.C. Viera V. Fernandez Juan C. Álvarez

The major drawback of usual dual three-phase AC machines, when supplied by a Voltage Source Inverter (VSI), is the occurrence of extra harmonic currents which circulate in the stator windings causing additional losses and constraints on the power component. This paper compares dedicated Pulse Width Modulation (PWM) strategies used for controlling a dual three-phase Permanent Magnet Synchronous machine supplied by a six-leg VSI. Since the application is intended for low-voltage (48V) mild- hybrid automotive traction, an additional major constraint arises: the compactness of the drive related to the size of the DC-bus capacitor. Thus, the PWM strategy must be chosen by taking into consideration its impact on both, the motor and the RMS value of DC-bus current

Internal resistance

Harmonic

Traction motor

10.1109/vppc.2014.7007058

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Citations (22)

Ion beam analysis of copper selenide thin films prepared by chemical bath deposition

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms (2000)

É. Andrade V. Fernandez P. K. Nair M. T. S. Nair E.P. Zavala

Ion beam analysis

Selenide

Chemical bath deposition

10.1016/s0168-583x(99)00994-5

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Citations (8)

Copper selenide thin films by chemical bath deposition

Journal of Crystal Growth (1999)

V. Fernandez P. K. Nair M. T. S. Nair

Selenide

Chemical bath deposition

Absorption band

10.1016/s0022-0248(99)00040-8

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Citations (188)

Direct methods for adsorbate structure determination using photoelectron diffraction

Journal of Electron Spectroscopy and Related Phenomena (1995)

O. Schaff Philip Hofmann Carol J. Hirschmugl A. Theobald V. Fernandez

10.1016/0368-2048(95)02411-5

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Citations (1)

Structure of adsorbed Fe on Ni{111}

Physical review. B, Condensed matter (1998)

A. Theobald V. Fernandez O. Schaff Philip Hofmann K.‐M. Schindler

Using photoelectron diffraction in the scanned energy mode we have established that Fe atoms adsorb in the fcc hollow sites of the Ni{111} surface even at low temperatures. Total-energy calculations had suggested that the hcp hollow sites were more stable.

10.1103/physrevb.58.6768

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Citations (9)