Vibrational Inelastic Electron Tunneling Spectroscopy Of Surface Adsorbed Single Molecules At Sub Kelvin Temperature
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| Author | : Chi-Lun Jiang |
| Publisher | : |
| Total Pages | : 204 |
| Release | : 2015 |
| Genre | : |
| ISBN | : 9781321995978 |
With a 600mk homebuilt UHV STM system, we studied molecular vibration at the solid surface with inelastic electron tunneling spectroscopy (IETS) of Acetylene single molecules adsorbed on Cu(100) surface and revealed five new vibrational modes that were previously inaccessible to STM-IETS at 8K temperature. The identification of vibrational IETS features with normalized conductance change (Î4Ï3/Ï3) as low as 0.24% was demonstrated. Facilitated by the high energy resolution, we also revealed the anisotropic vibrational energy of carbon0́3monoxide (CO) molecule induced by substrate surface symmetry. The discrepancy in vibrational energy as small as 0.8meV can be resolved by STM-IETS. Our results also showed that the change in vibrational behavior of CO can be used to understand its environment. CO can be vertically transferred from substrate surface to STM tip and creates a scanning probe which has the characteristic vibrational signal of CO contained in the inelastic component of the tunneling current; i.e. the inelastic tunneling probe (itProbe). The itProbe senses the local potential energy landscape by imaging the spatial variations of CO hindered-translational mode and resolves the skeletal structure and bonding details of a surface adsorbed Cobalt-Phthalocyanine molecule (CoPc). The image contrast of itProbe also reveals the interaction between one CoPc and the substrate surface as well as the interaction paths between neighboring CoPcs.
| Author | : T. Wolfram |
| Publisher | : Springer |
| Total Pages | : 260 |
| Release | : 1978-04 |
| Genre | : Science |
| ISBN | : |
Inelastic Electron Tunneling Spectroscop~ or lETS, provides a unique technique for electronically monitoring the vibrational modes of molecul (;5 adsorbed on a metal oxide surface. Since the discovery of the phenomena by JAKLEVIC and LM1BE in 1966, lETS has been developed by a number of scientists as a method for studying the surface chemistry of molecular species adsorbed on aluminum oxide. Recent applications of lETS include investigations of physical and chemical adsorption of hydrocarbons, studies of catalysis by metal particles, detection and identification of trace substances in air and water, and studies of biological molecules and electron damage to such molecules. lETS has been employed to investigate adhesive materials, and studies are currently in prog ress to investigate corrosion species and corrosion inhibitors on aluminum and its alloys. Electronic transitions of molecules have also been studied by lETS. The recent development of the "external doping" technique, whereby molecu lar species can be introduced into fabricated tunnel junctions, opens the door for a vast new array of surface chemical studies by lETS. lETS is rap idly becoming an important tool for the study of surface and interface phe nomena. In addition to its role in surface studies, inelastic tunneling has proved extremely valuable for the study of the electronic properties of thin metallic films, and the recent discovery of light emission from inelastic tunneling promises to be of some importance in the area of device physics.
| Author | : Shaowei Li |
| Publisher | : |
| Total Pages | : 70 |
| Release | : 2015 |
| Genre | : |
| ISBN | : 9781339526867 |
The power of rotational spectroscopy has long been demonstrated in the frequency domain by microwave spectroscopy, but its application in real space has been limited. Using a scanning tunneling microscope (STM) and inelastic electron tunneling spectroscopy (IETS), we were able to conduct real-space measurements of rotational transitions of gaseous hydrogen molecules physisorbed on surfaces at 10 K. The j=0 to j=2 rotational transition for para-H 2 and HD were observed by STM-IETS. It is also found that the rotational energy is very sensitive to its local environment, we could precisely investigate how the environmental coupling modifies the structure, including the bond length, of a single molecule with sub-Angstrom resolution. Due to this high sensitivity, the spatial variation in the potential energy surface can be quantified by the rotational and vibrational energies of the trapped H 2. The ability of the tip to drag along a hydrogen molecule as it scans over another adsorbed molecule combined with the sensitivity of the hydrogen rotational excitation recorded by IETS to its immediate environment lead to the implementation of rotational spectromicroscopy. Hydrogen rotational spectroscopy and microscopy provides novels approach toward visualizing and quantifying the intermolecular interaction as well as the intermediate processes of chemical reactions.
| Author | : C. R. Brundle |
| Publisher | : Elsevier |
| Total Pages | : 761 |
| Release | : 2000-04-01 |
| Genre | : Technology & Engineering |
| ISBN | : 0080954375 |
Studies in Surface Science and Catalysis 14: Vibrations at Surfaces documents the proceedings of the third International Conference on ""Vibrations at Surfaces"" held at Asilomar, California, from September 1-4, 1982. Almost all of the 102 papers presented at the meeting are published in this volume. The topics chosen for the eight sessions held over a span of three days were: (I) Vibrational Frequency Shifts and Widths-Lateral Interactions; (II) Dynamical Processes at Surfaces; (III) and (IV) Electron Loss Spectroscopy; (V) Raman and Surface Enhanced Raman Scattering; (VI) Infrared Absorption and Reflection Spectroscopy; (VII) Beam Surface Scattering Surface Phonons; (VIII) Electron Tunneling Spectroscopy - Surface Enhanced Raman Studies in Electrochemistry. In addition, C. B. Duke presented an introductory keynote surveying progress in the field since the last meeting. In the final session H. Ibach and T. Grimley presented conference overviews and future prospects for the field from an experimental and theoretical perspective. Also included in the Proceedings are four literature surveys on Energy Loss, Inelastic Tunneling, Infrared and Raman (SERS) papers.
| Author | : Zhumin Han |
| Publisher | : |
| Total Pages | : 241 |
| Release | : 2016 |
| Genre | : |
| ISBN | : 9781369228564 |
Compared to intramolecular interactions, intermolecular interactions are relatively weak but they lay the foundation for research involving molecular recognition, self-assembly and surface adsorption in chemical and physical systems. This dissertation describes three different experimental approaches based on the detection of molecular vibrations to provide direct insights into intermolecular interactions at the sub-Angstrom spatial resolution with a home built sub-Kelvin scanning tunneling microscope (STM).First, the intermolecular interaction can be evaluated by measuring the coupled vibrational mode of two interacting molecules with STM inelastic electron tunneling spectroscopy (IETS). The measurement of intermolecular coupled vibrations with tunable vertical and lateral displacements offers a direct assessment of the short range intermolecular repulsion in three dimensions.Second, the self-assembled molecular bonding structures can be imaged by the inelastic tunneling probe (itProbe). In itProbe, a carbon monoxide (CO) molecule is transferred onto the STM tip. The hindered translation energy of the CO-tip varies when it is positioned over different locations of the self-assembled structures. By recording the intensity variations of the inelastic electron tunneling signal caused by the energy shift, the geometric structure of each molecule and intermolecular interactions can be imaged in real space.Third, a sample surface can be considered as a giant molecule with infinite mass, and the binding strength of an adsorbed molecule on the surface is reflected in the external vibrations. The combination of the itProbe and IETS enable the determination of the adsorption configuration and low energy external vibrational modes of individual physisorbed benzene on an inert metal for the first time.All the approaches mentioned above rely on resolving fine spectral features induced by intermolecular interactions. The unprecedented spectral sensitivity, energy resolution and thermal stability achieved in 600 mK create the opportunity to study these weak intermolecular interaction effects at the single molecule level, which are otherwise obscured at higher temperatures.
| Author | : H. Ibach |
| Publisher | : Academic Press |
| Total Pages | : 379 |
| Release | : 2013-10-22 |
| Genre | : Science |
| ISBN | : 1483259455 |
Electron Energy Loss Spectroscopy and Surface Vibrations is devoted to electron energy loss spectroscopy as a probe of the crystal surface. Electrons with energy in the range of a few electron volts sample only a few atomic layers. As they approach or exit from the crystal, they interact with the vibrational modes of the crystal surface, or possibly with other elementary excitations localized there. The energy spectrum of electrons back-reflected from the surface is thus a rich source of information on its dynamics. The book opens with a detailed analysis of the physics that controls the operation of the monochromator, which is the core of the experimental apparatus. Separate chapters follow on the interaction of electrons with vibrational modes of the surface region and with other elementary excitations in the vicinity; the lattice dynamics of clean and adsorbate-covered surfaces, with emphasis on those features of particular relevance to surface vibrational spectroscopy; and selected applications vibration spectroscopy in surface physics and chemistry.
| Author | : Shiri Burema |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2013 |
| Genre | : |
| ISBN | : |
Inelastic 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.
| Author | : E. L. Wolf |
| Publisher | : OUP Oxford |
| Total Pages | : 617 |
| Release | : 2011-11-17 |
| Genre | : Science |
| ISBN | : 0191628166 |
Electron tunnelling spectroscopy is a research tool which has strongly advanced understanding of superconductivity. With the invention of the scanning tunneling microscope, STM, by Nobelists G. Binnig and H. Rohrer, beautiful images of atoms, rings of atoms and of exotic states in high temperature superconductors have appeared. Some of the most famous images of any kind, at this date, are STM topographs. This book explains the physics and the instrumentation behind the advances illustrated in the famous images, and summarizes the state of knowledge that has resulted. It presents the current state of the art of tunneling- and scanning tunneling spectroscopies of atoms, molecules and especially superconductors. The first edition of Principles of Electron Tunneling Spectroscopy has been a standard reference for active researchers for many years. This second edition fully embraces the advances represented by the scanning tunnelling microscope and, especially, scanning tunnelling spectroscopy. Stunning images of single atoms and spectral images of impurity states in high temperature superconductors will set this volume apart from its predecessor. The background and current status are provided for applications of Scanning Tunneling Microscopy and Spectroscopy to single atoms and molecules, including determination of bonding energies and vibrational frequencies. The applications to high temperature superconductivity are carefully introduced and the current status is described. A new section covers the astounding advances in instrumentation, which now routinely provide atomic resolution, and, in addition, developments in imaging and image processing, such as Fourier Transform Scanning Tunneling Spectroscopy.
| Author | : William Matthew Bowser |
| Publisher | : |
| Total Pages | : 344 |
| Release | : 1980 |
| Genre | : |
| ISBN | : |
| Author | : Siegfried Ewert |
| Publisher | : |
| Total Pages | : 20 |
| Release | : 1980 |
| Genre | : |
| ISBN | : |
