Littérature scientifique sur le sujet « STM-IETS »
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Articles de revues sur le sujet "STM-IETS"
KOMEDA, Tadahiro, Yousoo KIM, Yasuyuki SAINOO, Hidemi SHIGEKAWA et Maki KAWAI. « Techniques for STM-IETS Measurement ». Hyomen Kagaku 24, no 5 (2003) : 313–17. http://dx.doi.org/10.1380/jsssj.24.313.
Texte intégralKuhness, David, Jagriti Pal, Hyun Jin Yang, Nisha Mammen, Karoliina Honkala, Hannu Häkkinen, Wolf-Dieter Schneider, Markus Heyde et Hans-Joachim Freund. « Binding Behavior of Carbonmonoxide to Gold Atoms on Ag(001) ». Topics in Catalysis 63, no 15-18 (20 juin 2020) : 1578–84. http://dx.doi.org/10.1007/s11244-020-01290-3.
Texte intégralLee, Minjun, Myungchul Oh, Hoyeon Jeon, Sunwouk Yi, Inhae Zoh, Chao Zhang, Jungseok Chae et Young Kuk. « Selective resolution of phonon modes in STM-IETS on clean and oxygen-adsorbed Cu(100) surfaces ». Surface Science 689 (novembre 2019) : 121451. http://dx.doi.org/10.1016/j.susc.2019.06.001.
Texte intégralHapala, Prokop, Ruslan Temirov, F. Stefan Tautz et Pavel Jelínek. « Origin of High-Resolution IETS-STM Images of Organic Molecules with Functionalized Tips ». Physical Review Letters 113, no 22 (25 novembre 2014). http://dx.doi.org/10.1103/physrevlett.113.226101.
Texte intégralHapala, Prokop, Ruslan Temirov, F. Stefan Tautz et Pavel Jelínek. « Erratum : Origin of High-Resolution IETS-STM Images of Organic Molecules with Functionalized Tips [Phys. Rev. Lett.113, 226101 (2014)] ». Physical Review Letters 115, no 7 (12 août 2015). http://dx.doi.org/10.1103/physrevlett.115.079903.
Texte intégralThèses sur le sujet "STM-IETS"
Kersell, Heath Ryan. « Investigations on the Complex Rotations of Molecular Nanomachines ». Ohio University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1307126123.
Texte intégralLesnard, Hervé. « Structure électronique de molécules aromatiques sur une surface sondée par STM : apports récents des simulations ». Lyon, École normale supérieure (sciences), 2009. http://www.theses.fr/2009ENSL0553.
Texte intégralThe subject of my theoretical work deals with the capabilities of the STM tool to induce two types of local excitations, either vibrational or electronic on single adsorbed aromatic molecules on surfaces. Concerning vibrational excitations, the changes in tunneling conductance at vibrational thresholds have recently been used as an Inelastic Electron Tunneling Spectroscopy (IETS). We study the STM-induced dehydrogenation of benzene on Cu(100), where the reaction products could be either phenyl or benzyne fragments (group of W. Ho, Irvine). We demonstrate that they are solely identified with their theoretical IETS fingerprints being in quantitative agreement with the IETS measurements. We similarly investigate the dehydrogenation of pyridine and show that one heteroatom in the aromatic ring affects the magnitude of the IETS signatures. Conversely, we rationalize our findings in terms of inelastic propensity rules that couple the symmetry of the electronic scattering states and the molecular vibrators. In a second part, we study the electron-induced reactions of individual biphenyl molecules on a Si(100) surface, which have been investigated by using the tip of the STM as an atomic size source of electrons (group of G. Dujardin, Orsay). Selected types of molecular reactions are produced, depending on the polarity of the surface voltage during STM excitation. We determine all possible reaction pathways on the silicon surface, providing evidence that the observed selectivity as a function of the surface voltage polarity cannot be ascribed to different activation energies
Peronio, Angelo. « A closer look at heterogeneous catalysis : reaction intermediates at the single-molecule level ». Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8577.
Texte intégralThe present work pertains to the surface science approach to heterogeneous catalysis. In particular model systems for CO2 hydrogenation to methanol, and NO selective catalytic reduction, are investigated by means of a combined approach, where the molecular-level insight provided by a low-temperature scanning tunneling microscope is complemented by density functional theory (DFT) calculations of their electronic structure. To this end, the Inelastic Electron Tunneling Spectroscopy (STM-IETS) technique was introduced for the first time in our laboratory, a recent development which allows to measure the vibrational spectrum of individual molecules adsorbed on a surface. Regarding CO2, we provide single molecule imaging and characterization of CO2/Ni(110), chemisorbed with high charge transfer from the substrate, in an activated state that plays a crucial role in the hydrogenation process. We obtain a detailed characterization of the adsorption geometries and an estimate of the energies corresponding to the different adsorbed states. A consistent picture of CO2 chemisorption on Ni(110) is provided on the basis of the newly available information, yielding a deeper insight into the previously existing spectroscopic and theoretical data. In the Selective Catalytic Reduction (SCR) process, nitrogen oxide is selectively transformed to N2 by reductants such as ammonia. The specificity of this reaction was tentatively attributed to the formation of NH3-NO coadsorption complexes, as indicated by several surface science techniques. Here we characterize the NH3-NO complex at the atomic scale on the (111) surface of platinum, investigating the intermolecular interactions that tune the selectivity. The structures that arise upon coadsorption of NH3 and NO are analyzed in terms of adsorption sites, geometry, energetics and charge rearrangement. An ordered 2 × 2 adlayer forms, where the two molecules are arranged in a configuration that maximizes mutual interactions. In this structure, NH3 adsorbs on top and NO on fcc-hollow sites, leading to a cohesional stabilization of the extended layer by 0.29 eV/unit cell. The calculated vibrational energies of the individually-adsorbed species and of the coadsorption structure fit the experimental values found in literature within less than 6%. The characterizations and optimizations that had to be tackled in order to successfully perform STM-IETS measurement are eventually presented, focusing in particular on an original method which allows to increase the achieved resolution. Namely, the modulation broadening associated to phase-sensitive detection is reduced by employing a tailored modulation function, different from the commonly-used sinusoid. This method is not limited to STM-IETS, but can be easily applied whenever a lock-in amplifier is used to measure a second derivative.
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Burema, Shiri. « Inelastic Electron Tunneling Spectroscopy with the Scanning Tunneling Microscope : a combined theory-experiment approach ». Thesis, Lyon, École normale supérieure, 2013. http://www.theses.fr/2013ENSL0821.
Texte intégralInelastic Electron Tunneling Spectroscopy (IETS) with the Scanning Tunneling Microscope (STM) is a novel vibrational spectroscopy technique that permits to characterize very subtle properties of molecules adsorbed on metallic surfaces. Its proposed symmetry-based propensity selection rules, however, fail to fully capture its exact mechanism and influencing factors; are not directly retraceable to an adsorbate property and are cumbersome. In this thesis, a theoretical approach was taken to improve them. An IETS simulation protocol has been developed, parameterized and benchmarked, and consequently used to calculate IETS spectra for a set of systematically related small molecules on copper surfaces. Extending IETS principles were deduced that refer to the tunneling state’s vacuum extension, the selective activating/quenching of certain types of modes due to the moieties’ electronic properties, and the applicability of a sum rule of IETS signals. Also, fingerprinting IETS-signals that enable discrimination between adsorbate orientations, the chemical nature of atoms and structural isomers were determined and a strategy using straightforward electronic density distribution properties of the isolated molecule to predict IETS activity without (large) computational cost was developed. This expertise was used to rationalize and interpret experimentally measured IETS spectra for adsorbed metalloporphyrins and metallophthalocyanines, being the first IETS studies of this large size. This experimental approach permitted to determine the current limitations of IETS-simulations. The associated identification shortcomings were resolved by conducting complementary STM-image simulations
Choi, Taeyoung. « STM studies of charge transfer and transport through metal-molecule complexes on ultrathin insulating films ». The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1299525515.
Texte intégralSchuckman, Amanda Eileen. « Charge Transport through Organized Organic Assemblies in Confined Geometries ». Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9055.
Texte intégralChapitres de livres sur le sujet "STM-IETS"
Chen, C. Julian. « Scanning Tunneling Spectroscopy ». Dans Introduction to Scanning Tunneling Microscopy, 363–78. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780198856559.003.0015.
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