Download or read book A Study of Gas Phase Ion Chemistry Using High Pressure Mass Spectrometry written by Mark Ronald Achille Falcini and published by . This book was released on 1992 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Phase Ion Chemistry written by Michael T. Bowers and published by Academic Press. This book was released on 2013-10-22 with total page 363 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Advances in Gas Phase Ion Chemistry written by and published by Elsevier. This book was released on 1996-05-14 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Gas Phase Ion Chemistry
Download or read book Study of Gas Phase Ion molecule Reactions Using Resonant Two Photon Ionization high Pressure Mass Spectrometry written by Junling Gao and published by . This book was released on 1997 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Gas Phase Ion Chemistry written by K.R. Jennings and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 439 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents the proceedings of the 1990 Advanced Study Institute entitled "Fundamentals of Gas Phase Ion Chemistry" held at Mont Ste. Odile , Alsace, France, 25th June -6th July, 1990. The Institute brought together over 100 physicists, physical and organic chemists working on a wide variety of topics with gas-phase ion chemistry as the common theme. Many different viewpoints, making use of very different experimental and theoretical approaches, were brought to bear on the subject and provided a stimulating and up-to-date account of the subject. Although the Institute was built around the invited lectures, many specific points were addressed in workshops which consisted of informal discussion groups which were organised by participants during the Institute. This volume therefore contains not only chapters based on the lectures but summaries of many of the workshops which adds considerably to the diversity of information presented. This Advanced Study Institute was the fifth in a series of NATO-sponsored institutes devoted to various aspects of the physics and chemistry of gas phase ions. These meetings have been held every four years since the first, held in Biarritz in 1974, considered "Interactions between Ions and Molecules". The five volumes which comprise the proceedings of these meetings illustrate very clearly the many advances in theory and experiment which have taken place over the last 20 years.
Download or read book Advances in Gas Phase Ion Chemistry written by L.M. Babcock and published by Elsevier. This book was released on 2001-12-21 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Fundamentals and Applications of Gas Phase Ion Chemistry written by K.R. Jennings and published by Springer Science & Business Media. This book was released on 1999 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book draws together leading workers in the fields of mass spectrometry and gas phase ion chemistry, providing a forum for the exchange of ideas and information. It contains 14 lecture summaries and accounts of seven workshops with contributions from Europe and North America.
Download or read book Gas Phase Ion Chemistry written by Michael T. Bowers and published by Academic Press. This book was released on 2013-10-22 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas Phase Ion Chemistry, Volume 1 covers papers on the advances of gas phase ion chemistry. The book discusses the advances in flow tubes and the measurement of ion-molecule rate coefficients and product distributions; the ion chemistry of the earth's atmosphere; and the classical ion-molecule collision theory. The text also describes statistical methods in reaction dynamics; the state selection by photoion-photoelectron coincidence; and the effects of temperature and pressure in the kinetics of ion-molecule reactions. The energy distribution in the unimolecular decomposition of ions, as well as the rapidity of ion-molecule reactions are also encompassed. Chemists, physicists, and people working in aeronomy laboratory and involved in space research will find the book invaluable.
Download or read book Gas phase Ion Chemistry of Hydroxy and Amino substituted Interstellar Polycyclic Aromatic Hydrocarbons and Protonated Polycyclic Aromatic Hydrocarbons written by Mélanie Ouellette and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The gas-phase ion chemistry of hydroxyl- and amino-substituted polycyclic aromatic hydrocarbons (PAHs) and their protonated counterparts were studied using mass spectrometry. Ions were generated using an electron ionization (EI) source and the unimolecular chemistry of metastable ions was studied by performing mass-analysed ion kinetic energy spectrometry (MIKES) experiments with a magnetic sector tandem mass spectrometer. Collision-induced dissociation (CID) experiments were used in conjunction with MIKES experiments to determine ion structure. The ten molecules studied were: 1-naphthol, 2-naphthol, 1-naphthylamine, 2-naphthylamine, 1-aminoanthracene, 2-aminoanthracene, 1-phenanthrol, 9-phenanthrol, 1-hydroxypyrene and 1-aminopyrene. Since it is believed that larger PAHs, on the order of more than 50 carbon atoms, populate the interstellar medium, the goal of this study was to attempt to extrapolate the results from smaller systems to larger ones. The trends found include: hydroxy-substituted PAH radical cations lose carbon monoxide spontaneously and amino-substituted PAH radical cations lose HCN. Mechanisms for both processes are proposed, and it appears from the present results that this process should extrapolate to larger PAHs. Another trend found was that all the remaining fragment ions were always a closed ring. Protonated amino-substituted PAHs were generated by electrospray ionization using a quadruple time-of-flight mass spectrometer. By protonating 1-naphthol and 2-naphthol using methane in the high-pressure EI source, it was found that they lost exclusively H2O. As for 2-naphthylamine, 1-aminoanthracene and 2-aminoanthracene, it was found that 2-naphthylamine lost NH3 and a hydrogen atom, NH3being the dominant channel. However, as the ion size 3 increases, the hydrogen-loss channel became the dominant channel. This means that larger PAHs will likely lose exclusively a hydrogen atom to reform the parent radical cation.
Download or read book Chemical Ionization Mass Spectrometry written by Alex. G. Harrison and published by Taylor & Francis. This book was released on 2018-05-11 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only comprehensive guide to CIMS applications in structural elucidation and analytical studies Chemical Ionization Mass Spectrometry, 2nd Edition, provides a comprehensive, up-to-date review of CIMS applications in structural elucidation and quantitative analytical studies. For the benefit of readers without a background in gaseous ion chemistry, a thorough review is presented in Chapter 2. Other chapters discuss such topics as reagent ion systems within the context of the thermochemistry and kinetics of the ionization process, including reactions and the type of information obtained; isotopic exchange reactions; stereochemical effects in chemical ionization; and reactive ion/molecule collisions in quadrupole cells. Chemical ionization mass spectra of 13 classes of compounds are discussed in detail to illustrate the influence of different functional groups on the spectra observed. Chemical Ionization Mass Spectrometry, 2nd Edition will be a valuable reference for anyone interested in mass spectrometry and gaseous ion chemistry in general.
Download or read book Gas phase ion chemistry written by Michael T. Bowers and published by . This book was released on 1979 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of Thermal Ion molecule Equilibria determinations of Gas phase Basicities and Proton Affinities by High Pressure Mass Spectrometry written by Yan Kui Lau and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A pulsed electron beam, high pressure quadrupole mass spectrometer which was constructed for the study of ionmolecule equilibria is described. The mass spectrometer can be operated with ion source pressures up to 10 torr. The equilibrium constants for the proton transfer reactions: B-jH+ + B2 = B-j + B^H+ involving some 50 bases B whose gas-phase basicities are between water and 1,8-bis- (dimethylami no)naphthalene were measured at 600°K. This allowed the evaluation of AG°Q0 for the proton transfer reactions. A complete ladder of equilibria connecting these compounds was obtained. The temperature dependence of equilibrium constant was studied for two proton transfer reactions involving benzene and halobenzenes(f1uoroand chlorobenzene). The results showed that AS0 for proton transfer reactions can be estimated by considering the rotational symmetry numbers. The estimation of AS0 permitted the evaluation of AH0 from AG° for proton transfer reactions. Using the external standard proton affinity, PA(isobutene) = 198.2 kcal/mole (Beauchamp, Tsang), the absolute proton affinities of different compounds were obtained. These include: water 171.7, benzene 185.4, methanol 186.2, acetone 198.6, ketene 199.2, benzoic acid 200.2, ammonia 207.6, DMS0 214.4, methylamine 217.3 and 1 ,8-bi s(dimethyl amino)naphthalene 245.1 kcal/mole. The substituent effects on the intrinsic basicity of benzene were considered. It was observed that all monosubstituted benzenes have proton affinities higher than that of benzene. From the correlations of proton affinities with Hammett type a + substituent constants and ST0-3G calculated P results, it is suggested that protonation for anisole, phenol, ethylbenzene, toluene, fluoro- and chlorobenzene occurs at the ring. Substituent protonation is energetically more favorable for acetophenone, benzaldehyde, benzoic acid, benzonitrile and nitrobenzene. The proton affinity for Nprotonated aniline is very close to that for ring protonation. The gas-phase basicities of N-methyl substituted 1,8- diaminonaphthalenes and several related compounds were studied. The results indicated that ring protonation yields more stable ion for 1-aminonaphthal ene and m-phenylenediamine than N-protonation. All 1,8-diami nonaphthalenes are N-protonated. N-methyl substitution enhances the basicity of 1,8-diaminonaphthalene , but strong attenuation of the effects was observed in solution except for the fully N-methyla ted base. The high gas-phase basicity of 1,8-bis- (dimethylami no)naphthalene obtained in the present study is in agreement with the suggested explanation for its high aqueous basicity, namely, the effective removal of steric strain in the neutral base on protonation. The solvation of the proton by dimethyl sulfoxide molecules: H+(DMS0) , + DMSO = H+(DMS0)n> was studied for n = 2,3. The (n-1 ,n) interactions for DMSO were compared with those for water and dimethyl ether. The results showed that the ion-dipolar interactions in H (DM S 0) 3 is as strong as hydrogen bonding in the stabilization of the H+(H[subscript 2]O)[subscript 3] cluster.
Download or read book Investigations of Gas Phase Ion molecule Reactions at Elevated Pressures Using Ion Mobility mass Spectrometry written by Kris E. Sahlstrom and published by . This book was released on 1997 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas Phase Ion Chemistry written by Michael T. Bowers and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Studies of thermal ion molecule equilibria determination of gas phase basicities and proton affinities by high pressure mass spectrometry written by Yan Kui Lau and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gas phase Ion Chemistry Investigations by Ion Mobility and Mass Spectrometry written by Zhaoyu Zheng (Chemist) and published by . This book was released on 2021 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mass Spectrometry and Gas Phase Ion Chemistry written by Ben S. Freiser and published by . This book was released on 1999 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:
