Download or read book Infrared Spectroscopy of Ion hydrocarbon Clusters written by Oscar Rodriguez (Jr) and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Many biological and environmental systems contain ion, water, and hydrophobic components; and it is the balance between these competing interactions which governs their chemistry. This Thesis aims at exploring ion0́Ø0́Ø0́Øhydrocarbon interactions, then ion0́Ø0́Ø0́Øwater0́Ø0́Ø0́Øalkane interactions. To accomplish this, a combination of gas phase infrared predissociation spectroscopy (IRPD) and tandem mass spectrometry is utilized. The solvation of alkali metal ions by methane is discussed first, beginning with the effects of multiple argon atoms on Li+0́Ø0́Ø0́ØCH4 dimer clusters followed by a study of M+(CH4)n clusters where it is revealed that ions have a weak electrostatic effect beyond the first solvent shell. Next, the argon tagging and monitoring unique fragmentation channels are used to selectively probe for high energy Li+(H2O)3-4Ar1 conformers which contain extensive water hydrogen bonding. Finally, ion0́Ø0́Ø0́Øwater0́Ø0́Ø0́Øalkane interactions are probed in Li+(H2O)n clusters containing CH4 or C6H12 molecules. Some spectra contain hydrogen bonded peaks correlating to weak water0́Ø0́Ø0́Øalkane interactions. Furthermore, there is strong evidence that high energy conformers containing water hydrogen bonding are present in the cluster ion beam. This analysis is expanded to anionic Cl-(Water)m(CH4)n clusters to compare with cations. Density functional theory or MP2 level calculations were used to support and help characterize experimental data.
Download or read book Infrared Cavity Ringdown Spectroscopy of Hydrocarbon Ions and Clusters in Fast Ion Beams written by and published by . This book was released on 2004 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this effort were as follows: (1) extend the technical development of pulsed infrared (IR) cavity ringdown spectroscopy to longer wavelengths and higher spectral resolution; (2) develop its capacity as a general tool for trace gas analysis; and (3) study spectra, structures, hydrogen tunneling dynamics of hydrocarbon ions and complexes of relevance to ion-enhanced combustion processes. High-resolution, pulsed infrared cavity ringdown laser spectroscopy was developed and implemented for the study of carbon clusters and hydrocarbon ions. Several supersonic molecular beam sources of ions and hydrocarbons were constructed and tested by infrared cavity ringdown spectroscopy. The Stokes downconversion of pulsed visible laser radiation into the mid-infrared was explored in solid and liquid hydrogen media in an effort to explore more powerful and convenient infrared sources. Cavity ringdown studies of several different carbon/hydrocarbon systems were carried out. Nine related publications and three conference presentations are listed.
Download or read book Infrared Spectroscopy of Ionic Clusters written by John Michael Price and published by . This book was released on 1990 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Spectroscopy of Ionic Clusters written by and published by . This book was released on 1990 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes new experiments wherein the infrared vibrational predissociation spectra of a number of mass-selected ionic cluster systems have been obtained and analyzed in the 2600 to 4000 cm−1 region. The species studied include: the hydrated hydronium ions, H3O (H2O){sub 3 -10}, ammoniated ammonium ions, NH4(NH3){sub 1 -10} and cluster ions involving both water and ammonia around an ammonium ion core, (mixed clusters) NH4(NH3){sub n}(H2O){sub m} (n+m=4). In each case, the spectra reveal well resolved structures that can be assigned to transitions arising from the vibrational motions of both the ion core of the clusters and the surrounding neutral solvent molecules. 154 refs., 19 figs., 8 tabs.
Download or read book Infrared Spectroscopy of Molecular Ions and Ion solvent Clusters written by Jong-Ho Choi and published by . This book was released on 1995 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Spectroscopy of Gas Phase Cluster Ions written by Gabriele Santambrogio and published by . This book was released on 2007 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Spectroscopy of Cluster Ions High Energy Conformer Trapping and Multiple Photon Absorption written by Jordan P. Beck and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Infrared predissociation (IRPD) spectra of several cluster ions are presented, resulting in the emergence of two major themes. Trapped, high energy conformers are observed in argon tagged clusters. In non-argon tagged hydrated alkali metal ion clusters, multiple photon absorption processes can occur. The cluster ions discussed in this dissertation are generated by impacting neutral clusters with ions. If there is an energetic barrier between the neutral cluster configuration and the global minimum cluster ion configuration that is larger than the binding energy of the most labile ligand, then high energy conformers can be trapped. Thus, the trapped conformers retain some of the bonds of their neutral precursors. For example, neutral methanol dimer contains a hydrogen bond and a trapped, high energy Cl (CH3OH)2Ar conformer was observed which also contains a methanol0́Ø0́Ø0́Ømethanol hydrogen bond. Similar results are reported for M+(C6H6)2-4(H2O)2Ar and M+(benzyl alcohol)1(H2O)1-2Ar where IRPD spectra reveal hydrogen bonds resulting from the configurations of the neutral precursors. For most of the clusters studied, spectral features from high energy conformers and global minimum energy conformers were observed in the same spectra. However, a special case is reported in chapter 5 in which spectral features from high energy conformers and global minimum energy conformers of Li+(C6H6)2-4(H2O)2Ar were observed in different spectra corresponding to the fragmentation channel monitored. This conformer specific fragmentation greatly simplified the interpretation of the spectra and provided useful information on the cluster energetics. Conformer specific fragmentation was also observed for M+(H2O)5-7, but for a different reason. In the hydrogen bonded O-H stretching region, IRPD spectra obtained by monitoring the loss of two waters only contained features from linear hydrogen bonds. This mode dependent fragmentation is believed to be the result of multiple photon absorption. This conclusion is supported by laser-fluence dependence studies and by evaporative ensemble calculations.
Download or read book Gas Phase IR Spectroscopy and Structure of Biological Molecules written by Anouk M. Rijs and published by Springer. This book was released on 2015-06-03 with total page 409 pages. Available in PDF, EPUB and Kindle. Book excerpt: The series Topics in Current Chemistry presents critical reviews of the present and future trends in modern chemical research. The scope of coverage is all areas of chemical science including the interfaces with related disciplines such as biology, medicine and materials science. The goal of each thematic volume is to give the non-specialist reader, whether in academia or industry, a comprehensive insight into an area where new research is emerging which is of interest to a larger scientific audience. Each review within the volume critically surveys one aspect of that topic and places it within the context of the volume as a whole. The most significant developments of the last 5 to 10 years are presented using selected examples to illustrate the principles discussed. The coverage is not intended to be an exhaustive summary of the field or include large quantities of data, but should rather be conceptual, concentrating on the methodological thinking that will allow the non-specialist reader to understand the information presented. Contributions also offer an outlook on potential future developments in the field. Review articles for the individual volumes are invited by the volume editors. Readership: research chemists at universities or in industry, graduate students.
Download or read book Multiresonance Infrared Spectroscopy for the Separation and Characterization of Isomer Contributions in Gas phase Ion Clusters written by Ben Michael Elliott and published by . This book was released on 2010 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Elastomers Second Edition written by Anil K. Bhowmick and published by CRC Press. This book was released on 2000-11-02 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Provides the latest authoritative research on the developments, technology, and applications of rubbery materials. Presents structures, manufacturing techniques, and processing details for natural and synthetic rubbers, rubber-blends, rubber composites, and thermoplastic elastomers. 80% revised and rewritten material covers major advances since publication of the previous edition."
Download or read book Handbook of Nanophysics written by Klaus D. Sattler and published by CRC Press. This book was released on 2010-09-17 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of nanoscience was pioneered in the 1980s with the groundbreaking research on clusters, which later led to the discovery of fullerenes. Handbook of Nanophysics: Clusters and Fullerenes focuses on the fundamental physics of these nanoscale materials and structures. Each peer-reviewed chapter contains a broad-based introduction and enhances
Download or read book Mass and Infrared Spectra of Selected Unsaturated Hydrocarbons and Oxygenates written by Ronald F. Kendall and published by . This book was released on 1966 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experiments with Ions and Clusters in a Variable Temperature 22 pole Ion Trap written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, 22-pole ion trap machines have been applied to investigate protonated water clusters H+(H2O)n (n=4.10) and ionic hydrocarbons CHn+ (n=2.5) at low temperatures. Protonated water clusters H+(H2O)n play an important role in atmospheric chemistry and in interstellar space. The Taipei 22-pole ion trap machine has been applied to kinetic and spectroscopic investigations of these clusters produced from a supersonic expansion in a corona discharge source. Using low-pressure He buffer gas for collisional thermalization, refrigeration of the ion trap by liquid nitrogen allows a good control of the cluster temperature over the range 80K-350K. This method provides an accurate means of determining the dissociation energies of the cluster ions by measuring their dissociation rates as a function of temperature and calculating their internal energies from vibrational frequencies provided by density functional theory. Results of the thermochemical measurements at well-defined cluster temperatures have been given for H+(H2O)n, n=4.10. The feasibility of using the ion trap to acquire temperature-dependent infrared spectra is presented. The deuteration and abstraction reactions of small ionic hydrocarbons CHn+ (n=2.5) with H2, HD and D2 and the subsequent association processes have been explored at temperatures down to 15K in the Chemnitz 22-pole apparatus. The reactions of the investigated ionic species and their isotopic variants are important for understanding ion-molecule processes in the interstellar medium. One of the starting points of the research program was the question whether protonated methane, CH5+, is subject to H-D-exchange in collisions with HD at low temperatures. It turns out that the rate coefficient for this deuteration process is very small, whereas CH3+ deuterates with HD by three subsequent fast exchange reactions to CD3+ at a temperature of 15K. The latter process is very efficient and happens close to the collision limit. The methane cation,
Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1975 with total page 540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Chemistry of Cold Gas Phase Functional Molecules and Clusters written by Takayuki Ebata and published by Springer. This book was released on 2019-08-02 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes advanced research on the structures and photochemical properties of polyatomic molecules and molecular clusters having various functionalities under cold gas-phase conditions. Target molecules are crown ethers, polypeptides, large size protonated clusters, metal clusters, and other complex polyatomic molecules of special interest. A variety of advanced frequency and time-domain laser spectroscopic methods are applied. The book begins with the principle of an experimental setup for cold gas-phase molecules and various laser spectroscopic methods, followed by chapters on investigation of specific molecular systems. Through a molecular-level approach and analysis by quantum chemical calculation, it is possible to learn how atomic and molecular-level interactions (van der Waals, hydrogen-bonding, and others) control the specific properties of molecules and clusters. Those properties include molecular recognition, induced fitting, chirality, proton and hydrogen transfer, isomerization, and catalytic reaction. The information will be applicable to the design of new types of functional molecules and nanoparticles in the broad area that includes applied chemistry, drug delivery systems, and catalysts.
Download or read book Molecular and Laser Spectroscopy written by V.P. Gupta and published by Elsevier. This book was released on 2020-07-10 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular and Laser Spectroscopy, Advances and Applications: Volume 2 gives students and researchers an up-to-date understanding of the fast-developing area of molecular and laser spectroscopy. This book covers basic principles and advances in several conventional as well as new and upcoming areas of molecular and laser spectroscopy, such as a wide range of applications in medical science, material science, standoff detection, defence and security, chemicals and pharmaceuticals, and environmental science. It covers the latest advancements, both in terms of techniques and applications, and highlights future projections. Editors V.P. Gupta and Yukihiro Ozaki have brought together eminent scientists in different areas of spectroscopy to develop specialized topics in conventional molecular spectroscopy (Cavity ringdown, Matrix Isolation, Intense THz, Far- and Deep- UV, Optogalvanic ), linear and nonlinear laser spectroscopy (Rayleigh & Raman Scattering), Ultrafast Time-resolved spectroscopy, and medical applications of molecular spectroscopy. and advanced material found in research articles. This new volume expands upon the topics covered in the first volume for scientists to learn the latest techniques and put them to practical use in their work. - Covers several areas of spectroscopy research and expands upon topics covered in the first volume - Includes exhaustive lists of research articles, reviews, and books at the end of each chapter to further learning objectives - Uses illustrative examples of the varied applications to provide a practical guide to those interested in using molecular and laser spectroscopy tools in their research
Download or read book NBS Special Publication written by and published by . This book was released on 1968 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
