Exploring Intermolecular Interactions With The Scanning Tunneling Microscope
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| 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 | : Dror Sarid |
| Publisher | : John Wiley & Sons |
| Total Pages | : 310 |
| Release | : 2007-02-27 |
| Genre | : Science |
| ISBN | : 3527609873 |
This new and completely updated edition features not only an accompanying CD-ROM, but also a new applications section, reflecting the many breakthroughs in the field over the last few years. It provides a complete set of computational models that describe the physical phenomena associated with scanning tunneling microscopy, atomic force microscopy, and related technologies. The result is both a solid professional reference and an advanced-level text, beginning with the basics and moving on to the latest techniques, experiments, and theory. In the section devoted to atomic force microscopy, the author describes the mechanical properties of cantilevers, atomic force microscope tip-sample interactions, and cantilever vibration characteristics. This is followed by an in-depth treatment of theoretical and practical aspects of tunneling phenomena, including metal-insulator-metal tunneling and Fowler-Nordheim field emission. The final section features applications, dealing with, among others, Kelvin and Raman probe microscopy. The self-contained presentation spares researchers valuable time spent hunting through the technical literature for the theoretical results required to understand the models presented. The Mathematica code for all the examples is included in the CD-ROM, affording the freedom to change the values and parameters of specific problems as desired, or even modify the programs themselves to suit various modeling needs.
| Author | : Michael Lepper |
| Publisher | : |
| Total Pages | : |
| Release | : 2015 |
| Genre | : |
| ISBN | : 9783658110482 |
Michael Lepper presents a detailed room temperature scanning tunneling microscopy study of Nickel-tetraphenyltetrabenzoporphyrin on Cu(111), a prototype system for the fabrication of functional molecular architectures. The peculiar adsorption behavior, in particular the observation of three different coexisting supramolecular arrangements and the identification of two different intramolecular conformations within one arrangement, yield valuable insights into the specific molecular interactions and the self-assembly process in general. Contents Fundamentals of Scanning Tunneling Microscopy Experimental Setup Coverage Dependent Adsorption Behavior of Ni-TPBP on Cu(111) Polymorphism of the Supramolecular Arrangements Intermolecular Interactions within the Supramolecular Arrangements Intramolecular Conformations Target Groups Researchers and students in the fields of physical chemistry, surface science and molecular sciences Practitioners in these areas The Author Michael Lepper finished his Master Thesis under the supervision of PD Dr. Hubertus Marbach at the Chair for Physical Chemistry II of Prof. Hans-Peter Steinrück at the FAU Erlangen-Nürnberg, in which he is now working on his PhD thesis.
| Author | : David A. Micha |
| Publisher | : John Wiley & Sons |
| Total Pages | : 400 |
| Release | : 2019-11-18 |
| Genre | : Science |
| ISBN | : 1119319021 |
A modern, comprehensive text and reference describing intermolecular forces, this book begins with coverage of the concepts and methods for simpler systems, then moves on to more advanced subjects for complex systems – emphasizing concepts and methods used in calculations with realistic models and compared with empirical data. Contains applications to many physical systems and worked examples Proceeds from introductory material to advanced modern treatments Has relevance for new materials, biological phenomena, and energy and fuels production
| Author | : Samuel H. Cohen |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 243 |
| Release | : 2013-06-29 |
| Genre | : Technology & Engineering |
| ISBN | : 1475793251 |
This book represents the compilation of papers presented at the second Atomic Force Microscopy/Scanning Tunneling Microscopy (AFM/STM) Symposium, held June 7 to 9, 1994, in Natick, Massachusetts, at Natick Research, Development and Engineering Center, now part ofU.S. Army Soldier Systems Command. As with the 1993 symposium, the 1994 symposium provided a forum where scientists with a common interest in AFM, STM, and other probe microscopies could interact with one another, exchange ideas and explore the possibilities for future collaborations and working relationships. In addition to the scheduled talks and poster sessions, there was an equipment exhibit featuring the newest state-of-the-art AFM/STM microscopes, other probe microscopes, imaging hardware and software, as well as the latest microscope-related and sample preparation accessories. These were all very favorably received by the meeting's attendees. Following opening remarks by Natick's Commander, Colonel Morris E. Price, Jr., and the Technical Director, Dr. Robert W. Lewis, the symposium began with the Keynote Address given by Dr. Michael F. Crommie from Boston University. The agenda was divided into four major sessions. The papers (and posters) presented at the symposium represented a broad spectrum of topics in atomic force microscopy, scanning tunneling microscopy, and other probe microscopies.
| Author | : Wolfgang Fritzsche |
| Publisher | : Royal Society of Chemistry |
| Total Pages | : 357 |
| Release | : 2013 |
| Genre | : Science |
| ISBN | : 1849734607 |
This book explores in detail guanosine and its derivative with the goal of increasing knowledge of the basic principles of guanosine-assembly, synthesis of new optimised materials and exploration of their electronic and optical properties.
| Author | : Aurelia Meghea |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 386 |
| Release | : 2012-02-29 |
| Genre | : Medical |
| ISBN | : 9535100793 |
In a classical approach materials science is mainly dealing with interatomic interactions within molecules, without paying much interest on weak intermolecular interactions. However, the variety of structures actually is the result of weak ordering because of noncovalent interactions. Indeed, for self-assembly to be possible in soft materials, it is evident that forces between molecules must be much weaker than covalent bonds between the atoms of a molecule. The weak intermolecular interactions responsible for molecular ordering in soft materials include hydrogen bonds, coordination bonds in ligands and complexes, ionic and dipolar interactions, van der Waals forces, and hydrophobic interactions. Recent evolutions in nanosciences and nanotechnologies provide strong arguments to support the opportunity and importance of the topics approached in this book, the fundamental and applicative aspects related to molecular interactions being of large interest in both research and innovative environments. We expect this book to have a strong impact at various education and research training levels, for young and experienced researchers from both academia and industry.
| Author | : Benjamin Stadtmüller |
| Publisher | : Forschungszentrum Jülich |
| Total Pages | : 213 |
| Release | : 2013 |
| Genre | : |
| ISBN | : 389336871X |
| Author | : Chen Xu |
| Publisher | : |
| Total Pages | : 170 |
| Release | : 2016 |
| Genre | : |
| ISBN | : 9781339563589 |
With a sub-Kelvin scanning tunneling microscope, the energy resolution of spectroscopy is improved dramatically. Detailed studies of finer features of spectrum become possible. The asymmetry in the line shape of carbon monoxide vibrational spectra is observed to correlate with the couplings of the molecule to the tip and substrates. The spin-vibronic coupling in the molecular junctions is revisited with two metal phthalocyanine molecules, unveiling sharp spin-vibronic peaks. Finally, thanks to the improved spectrum resolution, the bonding structure of the acyclic compounds molecules is surveyed with STM inelastic tunneling probe, expanding the capability of the innovative high resolution imaging technique.
| Author | : Anne-Sophie Duwez |
| Publisher | : CRC Press |
| Total Pages | : 291 |
| Release | : 2011-12-07 |
| Genre | : Science |
| ISBN | : 1439809666 |
With the invention of scanning probe techniques in the early 1980s, scientists can now play with single atoms, single molecules, and even single bonds. Force, dynamics, and function can now be probed at the single-molecule level. Molecular Manipulation with Atomic Force Microscopy (AFM) presents a series of topics that discuss concepts and methodologies used to manipulate and study single (bio)molecules with AFM. The first part is dedicated to the pulling of single molecules with force spectroscopy to investigate molecular interactions, mechanics, and mechanochemical processes, and the second part to the manipulation, repositioning, and targeted delivery of single molecules on substrates. Single molecule manipulation is an exciting area of research which made important breakthroughs in nanoscience and which could find potential applications in a diverse range of disciplines, including chemistry, biology, physics, material and polymer science, and engineering. New and experienced AFM researchers looking for applications beyond imaging will find a wealth of information in this informative volume.
