Infrared Spectroscopy of Gas Phase Ions PDF Download

Author: Jacob C. Schmidt
Publisher:
ISBN:
Category :
Languages : en
Pages : 96

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Author: Gabriele Santambrogio
Publisher:
ISBN:
Category :
Languages : en
Pages : 196

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Author: Michael T. Bowers
Publisher: Academic Press
ISBN: 1483216497
Category : Science
Languages : en
Pages : 363

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Book Description
Gas Phase Ion Chemistry, Volume 2 covers the advances in gas phase ion chemistry. The book discusses the stabilities of positive ions from equilibrium gas-phase basicity measurements; the experimental methods used to determine molecular electron affinities, specifically photoelectron spectroscopy, photodetachment spectroscopy, charge transfer, and collisional ionization; and the gas-phase acidity scale. The text also describes the basis of the technique of chemical ionization mass spectrometry; the energetics and mechanisms of unimolecular reactions of positive ions; and the photodissociation of gas-phase ions. The applications of molecular beam techniques to the study of ion-molecule collisions; as well as the variational treatment of charge transfer reactions are also encompassed. Chemists and biochemists will find the book invaluable.

Author: Anouk M. Rijs
Publisher: Springer
ISBN: 3319192043
Category : Science
Languages : en
Pages : 409

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Book Description
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.

Author: Jeffrey Albert Draves
Publisher:
ISBN:
Category :
Languages : en
Pages : 338

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The solvation of the alkali ions Na$sp{+}$ and Cs$sp{+}$ by methanol has been investigated by gas-phase vibrational spectroscopy and Monte Carlo simulations of small ion clusters: Na(CH$sb3$OH) $sbsp{rm N}{+}$, N = 6 to 15 and Cs(CH$sb3$OH) $sbsp{rm N}{+}$, N = 4 to 25. The solvated ions, generated by combining a thermionic alkali ion source with a molecular beam source, have considerable amounts of internal energy. The excess energy is dissipated by evaporation. The quasi-stable cluster ions are mass-selected for vibrational predissociation spectroscopy. The spectra are collected using a line-tunable cw-CO$sb2$ laser. Vibrational spectra indicate that the first solvation shell about the Na$sp{+}$ consists of six methanols while that about the Cs$sp{+}$ consists of ten. Large clusters of Cs(CH$sb3$OH) $sbsp{rm N}{+}$ (N $geq$ 18) appear to have small clusters of methanol bound to the surface of the solvated ion. Na(CH$sb3$OH) $sbsp{rm N}{+}$ clusters appear to have two structurally enhanced regions, i.e. a first and a second solvation shell. Monte Carlo simulations using pairwise interaction potentials were run at temperatures between 200 K and 300 K for the solvated ions Na(CH$sb3$OH) $sbsp{rm N}{+}$, N = 6-8, 10, 12, 15, and 25, and for Cs(CH$sb3$OH) $sbsp{rm N}{+}$, N = 6-16, and 25. Simulation results show the first solvation shell of Na$sp{+}$ and Cs$sp{+}$ is filled by 6.2 and 10.5 methanols, respectively. These numbers are consistent with experimental results. The simulations also indicate that hydrogen bonding plays a significant role in shaping the solvent shell structure for both species. Once the first solvation shell is filled, the size of the solvent shell appears to be independent of additional solvent molecules. After N = 6 for Na(CH$sb3$OH) $sbsp{rm N}{+}$, and N = 10 for Cs(CH$sb3$OH) $sbsp{rm N}{+}$ methanols begin entering the second solvent region, this shell is not filled before methanols enter the third solvent region. This is an indication of the extent to which the ion influences the solvating methanols. Gas-phase solvated ions appear to be useful models for dilute electolyte solutions. This technique produces solvated ions which exhibit several solvent regions. With the combination of the Monte Carlo simulations and vibrational spectroscopy, a clear picture of the solvation shell structure can be obtained.

Author:
Publisher: Elsevier
ISBN: 0080550886
Category : Science
Languages : en
Pages : 281

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Advances in Gas Phase Ion Chemistry

Author: Nicholas Leo Pivonka
Publisher:
ISBN:
Category :
Languages : en
Pages : 256

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Author: L.M. Babcock
Publisher: Elsevier
ISBN: 008049322X
Category : Science
Languages : en
Pages : 331

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Book Description
Gas phase ion chemistry is a broad field that has many applications and which encompasses various branches of chemistry and physics. Advances in Gas Phase Ion Chemistry, Volume 4, describes innovative ways of studying reactions as well as the application of unique apparatuses to problems in this field. This volume contains a series of chapters, in the general area of gas phase chemistry and physics, which are at the cutting edge of research. The chapters are not meant to be general reviews, but focus on the author's own work. They focus on both experimental and theoretical work, which gives a balance to the volume. Applications are included to appeal to a wider audience and to broaden the knowledge of the more fundamentally inclined. An application to environmental pollution monitoring and medical monitoring of breath is included. With successive volumes, the coverage broadens to include more current research in the title area. The book is aimed at graduate researchers, university faculty and graduates in industry. The editors have made a specific effort to include contributions from those relatively new to the field, which brings in new ideas and perspectives, as well as those more established workers, who bring a wealth of experience.

Author: Michael T. Bowers
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 480

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Author: Widana Kankanamge Dayangani Nirosha Kaushalya
Publisher:
ISBN:
Category :
Languages : en
Pages : 86

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Book Description
While chemical isomers typically have distinct properties, differentiating between them is often an analytical challenge, especially for mass spectrometric methods. Infrared multiple photon dissociation (IRMPD) spectroscopy and ion mobility spectrometry (IMS) can be useful in analysis of such isomeric compounds; however, experimental results alone do not directly provide in-depth structural information. In this thesis, computational chemistry is first used to explain experimental results and understand the conformational preference of the gas phase ions formed from the lithiation of cis-3, cis-4 and trans-4 hydroxyproline isomers and then used in a predictive manner to evaluate IRMPD spectroscopy and IMS as potential paths forward for the characterization of isomeric dye species. Finally, theoretical methods are used to begin to understand the dissociation pathways of lithiated hydroxyproline isomers in the gas phase, which is ongoing.