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    • Plusieurs versions

    Spatiotemporal patterns of external noise-induced transitions in a bistable reaction-diffusion system: photoelectron emission microscopy experiments and modeling.

    Wehner, Stefan, Hoffmann, Patrick, Schmeisser, Dieter, Brand, Helmut R, Küppers, Jürgen
    Physical review letters, July 15, 2005, Vol.95(3), p.038301 [Revue évaluée par les pairs]

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    Low energy electrons and surface chemistry

    Ertl, Gerhard
    Küppers, Jürgen
    Weinheim : VCH Verlag
    1985
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    Titre: Low energy electrons and surface chemistry / G. Ertl, J. Küppers
    Auteur: Ertl, Gerhard
    Contributeur: Küppers, Jürgen
    Edition: 2nd, completely rev. ed.
    Editeur: Weinheim : VCH Verlag
    Date: 1985
    Collation: XII, 374 p. : ill. ; 25 cm
    Classification: LC QD506
    Identifiant: 3527260560 (ISBN); http://catalogue.bnf.fr/ark:/12148/cb373531795 (URN)
    No RERO: 1807977
    Permalien:
    http://data.rero.ch/01-1807977/html?view=FR_V1

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    A TDS study of D adsorption on terraces and terrace edges of graphite (0 0 0 1) surfaces

    Zecho, Thomas, Güttler, Andreas, Küppers, Jürgen
    Carbon, 2004, Vol.42(3), pp.609-617 [Revue évaluée par les pairs]
    ScienceDirect Journals (Elsevier)
    • Article
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    Reactions of gas-phase H atoms with atomically and molecularly adsorbed oxygen on Pt(111)

    Biener, Jürgen, Lang, Erwin, Lutterloh, Carsten, Küppers, Jürgen
    The Journal of Chemical Physics, 15 February 2002, Vol.116(7), pp.3063-3074 [Revue évaluée par les pairs]
    © 2002 American Institute of Physics (AIP)
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    Titre: Reactions of gas-phase H atoms with atomically and molecularly adsorbed oxygen on Pt(111)
    Auteur: Biener, Jürgen; Lang, Erwin; Lutterloh, Carsten; Küppers, Jürgen
    Sujet: Articles
    Description: The interaction of gas-phase H atoms with ordered and disordered adlayers of atomic oxygen, hydroxyl, and molecular oxygen on Pt(111) surfaces was investigated by in situ mass spectrometry and post-reaction TPD (temperature programed desorption). Exposure of oxygen adlayers to gas-phase H atoms at 85 K leads to formation of H 2 O via two consecutive hydrogenation reactions: H (g)+ O (a)→ OH (a) followed by H (g)+ OH (a)→ H 2 O (g,a). Both reaction steps are highly exothermic, and nascent H 2 O molecules partially escape into the gas phase before being thermally accommodated on the surface. Empty surface sites and hydrogen bonding promote thermalization of H 2 O . Separate experiments performed with OH-covered Pt(111) surfaces reveal that the hydrogenation of hydroxyl is a slow reaction compared to the hydrogenation of atomic oxygen; additionally, the abstraction of H from OH by gas-phase D atoms, OH (a)+ D (g)→ O (a)+ HD (g), was detected. Abstraction of H from adsorbed H 2 O was not observed. Admission of gas-phase H atoms to O 2 -covered Pt(111) surfaces at 85 K leads to the desorption of O 2 and H 2 O . The thermodynamic stability of the HO 2 radical suggests that the reaction is initiated by hydrogenation of molecular oxygen, O 2 (a)+ H (g)→ HO 2 . The intermediate HO 2 either decomposes via dissociation of the HO–O bond, HO 2 → OH (a)+ O (a), finally leading to the formation of H 2 O (∼85%), or via dissociation of the H–O 2 bond thus leading to desorption of O 2 (∼15%). The whole reaction sequence of formation and decomposition of HO 2 is fast compared to the formation of H 2 O via hydrogenation of atomic oxygen and hydroxyl. The observed coverage dependence of the reaction kinetics indicates the dominance of hot-atom mediated reactions.
    Fait partie de: The Journal of Chemical Physics, 15 February 2002, Vol.116(7), pp.3063-3074
    Identifiant: 0021-9606 (ISSN); 1089-7690 (E-ISSN); 10.1063/1.1436075 (DOI)

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    Adsorption of hydrogen and deuterium atoms on the (0001) graphite surface

    Zecho, Thomas, Güttler, Andreas, Sha, Xianwei, Jackson, Bret, Küppers, Jürgen
    The Journal of Chemical Physics, 08 November 2002, Vol.117(18), pp.8486-8492 [Revue évaluée par les pairs]
    © 2002 American Institute of Physics (AIP)
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    Titre: Adsorption of hydrogen and deuterium atoms on the (0001) graphite surface
    Auteur: Zecho, Thomas; Güttler, Andreas; Sha, Xianwei; Jackson, Bret; Küppers, Jürgen
    Sujet: Articles
    Description: Adsorption of H and D on HOPG surfaces was studied with thermal desorption (TDS), electronic (ELS), and high-resolution electron-energy-loss (HREELS) spectroscopies. After admission of H (D) from thermal (2000 K) atom sources to clean graphite surfaces TD spectra revealed recombinative molecular H 2 ( D 2 ) desorption in a main peak around 445 K (490 K) and a minor peak at 560 K (580 K). After admission of higher fluences the main peak shifts to 460 K (500 K) and develops a shoulder at 500 K (540 K). The saturation coverages were calculated as 0.4±0.2 for H and D and initial sticking coefficients of 0.4±0.2 were obtained. Through leading edge analysis of the TD spectra desorption activation energies for H and D were determined as 0.6 and 0.95 eV, respectively. EL spectra suggest a 16% loss of the sp 2 character of the surface carbon 2sp electrons upon D adsorption. HREEL spectra of H (D) graphite covered surfaces reveal in addition to two graphite-intrinsic optical phonon losses vibrational features at 1210 and 2650  cm −1 (and 640 and 1950  cm −1 ). These frequencies are in excellent agreement with those obtained from a recently published H (D)/graphite potential energy surface. A theoretical description of the desorption process through calculated H + H / graphite potential surfaces reveals the desorption mechanism and desorption activation energies which are in good agreement with the measured data.
    Fait partie de: The Journal of Chemical Physics, 08 November 2002, Vol.117(18), pp.8486-8492
    Identifiant: 0021-9606 (ISSN); 1089-7690 (E-ISSN); 10.1063/1.1511729 (DOI)

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    UHV Study of Hydrogen Atom Induced Etching of Amorphous Hydrogenated Silicon Thin Films

    Zecho, Thomas, Brandner, Birgit D, Biener, Jürgen, Küppers, Jürgen
    The journal of physical chemistry. B, 03 May 2001, Vol.105(17), pp.3502-3509 [Revue évaluée par les pairs]

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    Hydrogen-Induced Chemical Erosion of a-C:H Thin Films:  Product Distribution and Temperature Dependence

    Zecho, Thomas, Brandner, Birgit D, Biener, Jürgen, Küppers, Jürgen
    The Journal of Physical Chemistry B, 05 July 2001, Vol.105(26), pp.6194-6201 [Revue évaluée par les pairs]

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    Hydrogen-Induced Chemical Erosion of Amorphous Hydrogenated Carbon Thin Films:  Structure and Reactivity

    Zecho, Thomas, Brandner, Birgit D, Biener, Jürgen, Küppers, Jürgen
    The Journal of Physical Chemistry B, 24 January 2002, Vol.106(3), pp.610-616 [Revue évaluée par les pairs]

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    Multiplicative Temperature Noise Applied to a Bistable Surface Reaction:  Experiment and Theory †

    Wehner, Stefan, Hayase, Yumino, Brand, Helmut R, Küppers, Jürgen
    The Journal of Physical Chemistry B, 23 September 2004, Vol.108(38), pp.14452-14461 [Revue évaluée par les pairs]

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    Stochastic aspects of pattern formation during the catalytic oxidation of CO on Pd(111) surfaces

    Wehner, Stefan, Karpitschka, Stefan, Burkov, Yevgen, Schmeisser, Dieter, Küppers, Jürgen, Brand, Helmut R
    Physica D: Nonlinear Phenomena, 2010, Vol.239(11), pp.746-751 [Revue évaluée par les pairs]