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 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 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 Laser Spectroscopy VII written by Theo W. Hansch and published by . This book was released on 2014-01-15 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Spectroscopy of Molecular Clusters written by Martina H Havenith and published by Springer. This book was released on 2014-01-15 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Spectroscopy and Radiative Lifetimes of Molecular Ions written by Mitchio Okumura and published by . This book was released on 1986 with total page 382 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 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 Infrared Laser Spectroscopy of Molecular Ions and Clusters written by Martin H.W. Gruebele and published by . This book was released on 1988 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Elucidating the Structures of Ionic Clusters from Ion water Complexes to Ion biomolecule water Complexes written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book LBL Research Review written by and published by . This book was released on 1990 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Resolution Infrared Spectroscopy of Molecular Clusters written by Glenn Walter Ross Bryant and published by . This book was released on 1989 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Infrared Spectroscopy of CO2 and H2O Molecular Clusters written by Robert S. Disselkamp and published by . This book was released on 1990 with total page 370 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 Slow Photoelectron Imaging and Infrared Dissociation Spectroscopy of Ionic Clusters written by Etienne Garand and published by . This book was released on 2010 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The anion slow photoelectron velocity-map imaging (SEVI) technique, a high resolution (̃1 cm-1) variant of anion photoelectron spectroscopy, is applied to the study of open-shell anions and neutral species. First, SEVI is used to study the CnH (n=5-9), C2nN (n=1-3), CnO (n=2-3) and CnS (n=2-3) heteroatom doped carbon clusters. The SEVI spectra are assigned with the help of electronic structure calculations and Franck-Condon simulations. Precise electron affinities, term energies and vibrational frequencies are determined for these species. These studies also yield evidence of vibronic coupling in the ground states of C6H, C8H, C9H and CCS. Futhermore, it is found that the ground states of the C5H-;, C7H-;, C7H-;, C4N-; and C6N-; anions are linear triplet sigma states, contrary to previous theoretical studies that reported bent structures. In addition, the strong vibronic coupling between the very close-lying 2A1 and 2B2 states of the HCO2 and DCO2 radicals is studied using SEVI. The complex photodetachment spectra are simulated and assigned using a quasidiabatic Hamiltonian approach. The strong vibronic coupling is highlighted by the observation of several nominally forbidden transitions. The SEVI technique is also applied to the study of the weakly bound ArO and KrO van der Waals complexes. The interaction potential and spin-orbit splitting of the neutral and anion states are determined and compared with high-level electronic structure calculations. Finally, the SEVI spectra of the ClH2-; and ClD2-; anions are used to characterized the electronic and nuclear coupling in the pre-reactive region of the Cl(2P)+H2 reaction and to understand the reactivity of the excited spin-orbit state of chlorine. The SEVI spectra are compared to simulations with and without non-adiabatic couplings between the Cl spin-orbit states. The non-adiabatic effects are found to be small but their inclusion improves agreement with experiment. The second part of this work concerns the structure of ionic clusters which is studied with infrared multiple photon dissociation (IRMPD) spectroscopy. The stepwise solvation of the bicarbonate anion is probed by acquiring the IRPMD spectra of HCO3-(H2O)1-10 clusters in the gas-phase. Electronic structure calculations have been performed on the n=1-8 clusters to identify the structure of the low-lying isomers and to assign the observed spectral features. It is found that the water molecules preferably bind to the negatively charged CO2 moiety of the HCO3 & hibar; anion. A binding motif consisting of a four-membered ring with each water forming a single H-bond with the CO2 moiety is found for clusters with n=4 or larger. In addition, the structure of the small (SiO)3-5+ clusters have been studied with IRPMD and electronic structure calculations. The onset for the formation of the first Si-Si bond is observed for the n=5 cluster.
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:
