Download or read book Spectroscopy and Reaction Kinetics of a Criegee Intermediate CH3CHOO Using Time resolved Broadband Cavity enhanced Absorption Spectrometry written by and published by . This book was released on 2015 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Time resolved Broadband Cavity enhanced Absorption Spectroscopy for Chemical Kinetics written by and published by . This book was released on 2013 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental measurements of elementary reaction rate coefficients and product branching ratios are essential to our understanding of many fundamentally important processes in Combustion Chemistry. However, such measurements are often impossible because of a lack of adequate detection techniques. Some of the largest gaps in our knowledge concern some of the most important radical species, because their short lifetimes and low steady-state concentrations make them particularly difficult to detect. To address this challenge, we propose a novel general detection method for gas-phase chemical kinetics: time-resolved broadband cavity-enhanced absorption spectroscopy (TR-BB-CEAS). This all-optical, non-intrusive, multiplexed method enables sensitive direct probing of transient reaction intermediates in a simple, inexpensive, and robust experimental package.
Download or read book Direct Spectroscopic and Kinetic Studies of the Simplest Criegee Intermediate written by Elizabeth Stack Foreman and published by . This book was released on 2017 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric chemistry is driven largely by free radical species whose reactions determine both the composition and oxidative capacity of the atmosphere. Carbonyl oxides, or Criegee Intermediates, formed in the ozonolysis of alkenes in the troposphere are highly reactive biradicals/zwitterions that are implicated in the production of secondary organic aerosol and particulate matter. This thesis will focus on the following aspects of the spectroscopy and kinetics related to the simplest Criegee Intermediate, formaldehyde oxide: (1) kinetics of IO radical formation from the CH2I + O2 reaction, (2) spectroscopy and dynamics of electronically excited states of CH 2OO, (3) the kinetics of reactions of CH2OO with trace atmospheric pollutants. The spectroscopic and kinetic study of IO radicals formed as minor products in the laboratory synthesis of Criegee Intermediates is performed using cavity ring-down spectroscopy (CRDS). We observe experimentally that IO radicals exhibit vibrational state specific formation kinetics and suggest that this is due to a product branching ratio controlled by the degree of internal excitation in the reactants. IO and CH2OO are produced simultaneously in the reaction of CH2I with O2 and exhibit overlapping absorption bands in the near-ultraviolet/visible. This poses a challenge for direct detection of CH2OO using a linear absorption technique. The measured rate constant for the formation of IO is used to deconvolute the total observed absorption spectrum into individual molecular components. Both CRDS and single-pass broadband transient absorption spectroscopy (BBTAS) are used to independently measure the absolute absorption cross sections for the second electronically excited state of CH2OO in the near-ultraviolet/visible. We show that the absorption spectra do not exhibit fine structure, even at the lowest excitation energies, and that the observed broad lineshapes cannot be attributed hot bands. This suggests that the photolysis quantum yield is “1 and the observed structure in the electronic absorption spectrum, that is absent from the action spectrum, is the result of relaxation via nonradiative population transfer to a long-lived state or fluorescence. BBTAS is subsequently used to probe the kinetics of the reactions of CH2OO with two inorganic acids: HCl and HNO3. We find that these reactions occur at or near the collision limit and that nitric acid in particular may be locally competitive with water vapor, which is widely accepted as the dominant sink for Criegee Intermediates in the atmosphere. Taken together these studies provide a deeper understanding of the role Criegee Intermediates play in tropospheric chemistry.
Download or read book UV Spectroscopic Probing of the Reaction Kinetics of Criegee Intermediates CH2OO and the Syn and Anti Isomers of CH3CHOO written by and published by . This book was released on 2014 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Primary Explosives written by Robert Matyáš and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the first comprehensive overview of this topic. It serves as a single source for information about the properties, preparation, and uses of all relevant primary explosives. The first chapter provides background such as the basics of initiation and differences between requirements on primary explosives used in detonators and igniters. The authors then clarify the influence of physical characteristics on explosive properties, focusing on those properties required for primary explosives. Furthermore, the issue of sensitivity is discussed. All the chapters on particular groups of primary explosives are structured in the same way, including introduction, physical and chemical properties, explosive properties, preparation and documented use. The authors thoroughly verified all data and information. A unique feature of this book are original microscopic images of some explosives.
Download or read book Solvents and Solvent Effects in Organic Chemistry written by Christian Reichardt and published by John Wiley & Sons. This book was released on 2006-03-06 with total page 653 pages. Available in PDF, EPUB and Kindle. Book excerpt: In most cases, every chemist must deal with solvent effects, whether voluntarily or otherwise. Since its publication, this has been the standard reference on all topics related to solvents and solvent effects in organic chemistry. Christian Reichardt provides reliable information on the subject, allowing chemists to understand and effectively use these phenomena. 3rd updated and enlarged edition of a classic 35% more contents excellent, proven concept includes current developments, such as ionic liquids indispensable in research and industry From the reviews of the second edition: "...This is an immensely useful book, and the source that I would turn to first when seeking virtually any information about solvent effects." —Organometallics
Download or read book Physics of and Science with X Ray Free Electron Lasers written by J. Hastings and published by IOS Press. This book was released on 2020-12-18 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many X-Ray Free-Electron Lasers (X-FELs) have been designed, built and commissioned since the first lasing of the Linac Coherent Light Source in the hard and soft X-ray regions, and great progress has been made in improving their performance and extending their capabilities. Meanwhile, experimental techniques to exploit the unique properties of X-FELs to explore atomic and molecular systems of interest to physics, chemistry, biology and the material sciences have also been developed. As a result, our knowledge of atomic and molecular science has been greatly extended. Nevertheless, there is still much to be accomplished, and the potential for discovery with X-FELs is still largely unexplored. The next generation of scientists will need to be well versed in both particle beams/FEL physics and X-ray photon science. This book presents material from the Enrico Fermi summer school: Physics of and Science with X-Ray Free-Electron Lasers, held at the Enrico Fermi International School of Physics in Varenna, Italy, from 26 June - 1 July 2017. The lectures presented at the school were aimed at introducing graduate students and young scientists to this fast growing and exciting scientific area, and subjects covered include basic accelerator and FEL physics, as well as an introduction to the main research topics in X-FEL-based biology, atomic molecular optical science, material sciences, high-energy density physics and chemistry. Bridging the gap between accelerator/FEL physicists and scientists from other disciplines, the book will be of interest to all those working in the field.
Download or read book Flavin based Catalysis written by Radek Cibulka and published by Wiley-VCH. This book was released on 2021-09-07 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a unique overview of this rapidly developing research field, presenting structures and properties of flavin derivatives as well as their proven application as bioinspired catalysts in various organocatalytic, biocatalytic, and photocatalytic reactions.
Download or read book 13th European Workshop on Lignocellulosics and Pulp written by and published by . This book was released on with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanisms of Atmospheric Oxidation of the Alkanes written by Jack G Calvert and published by Oxford University Press. This book was released on 2008-09-15 with total page 1005 pages. Available in PDF, EPUB and Kindle. Book excerpt: An international team of eminent atmospheric scientists have prepared Mechanisms of Atmospheric Oxidation of the Alkanes as an authoritative source of information on the role of alkanes in the chemistry of the atmosphere. The book includes the properties of the alkanes and haloalkanes, as well as a comprehensive review and evaluation of the existing literature on the atmospheric chemistry of the alkanes and their major atmospheric oxidation products, and the various approaches now used to model the alkane atmospheric chemistry. Comprehensive coverage is given of both the unsubstituted alkanes and the many haloalkanes. All the existing quality measurements of the rate coefficients for the reactions of OH, Cl, O(3P), NO3, and O3 with the alkanes, the haloalkanes, and their major oxidation products have been reviewed and evaluated. The expert authors then give recommendations of the most reliable kinetic data. They also review the extensive literature on the mechanisms and rates and modes of photodecomposition of the haloalkanes and the products of atmospheric oxidation of the alkanes and the haloalkanes, and make recommendations for future use by atmospheric scientists. The evaluations presented allow an extrapolation of the existing kinetic and photochemical data to those alkanes and haloalkanes that are as yet unstudied. The current book should be of special interest and value to the modelers of atmospheric chemistry as a useful input for development of realistic modules designed to simulate the atmospheric chemistry of the alkanes, their major oxidation products, and their influence on ozone and other trace gases within the troposphere.
Download or read book Spectroscopy and Kinetics written by James S. Mattson and published by Marcel Dekker. This book was released on 1973 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Atmospheric Chemistry and Physics written by John H. Seinfeld and published by John Wiley & Sons. This book was released on 2012-12-18 with total page 1249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thoroughly restructured and updated with new findings and new features The Second Edition of this internationally acclaimed text presents the latest developments in atmospheric science. It continues to be the premier text for both a rigorous and a complete treatment of the chemistry of the atmosphere, covering such pivotal topics as: * Chemistry of the stratosphere and troposphere * Formation, growth, dynamics, and properties of aerosols * Meteorology of air pollution * Transport, diffusion, and removal of species in the atmosphere * Formation and chemistry of clouds * Interaction of atmospheric chemistry and climate * Radiative and climatic effects of gases and particles * Formulation of mathematical chemical/transport models of the atmosphere All chapters develop results based on fundamental principles, enabling the reader to build a solid understanding of the science underlying atmospheric processes. Among the new material are three new chapters: Atmospheric Radiation and Photochemistry, General Circulation of the Atmosphere, and Global Cycles. In addition, the chapters Stratospheric Chemistry, Tropospheric Chemistry, and Organic Atmospheric Aerosols have been rewritten to reflect the latest findings. Readers familiar with the First Edition will discover a text with new structures and new features that greatly aid learning. Many examples are set off in the text to help readers work through the application of concepts. Advanced material has been moved to appendices. Finally, many new problems, coded by degree of difficulty, have been added. A solutions manual is available. Thoroughly updated and restructured, the Second Edition of Atmospheric Chemistry and Physics is an ideal textbook for upper-level undergraduate and graduate students, as well as a reference for researchers in environmental engineering, meteorology, chemistry, and the atmospheric sciences. Click here to Download the Solutions Manual for Academic Adopters: http://www.wiley.com/WileyCDA/Section/id-292291.html
Download or read book Molecular Structure and Dynamics written by W. H. Flygare and published by Prentice Hall. This book was released on 1978 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Good,No Highlights,No Markup,all pages are intact, Slight Shelfwear,may have the corners slightly dented, may have slight color changes/slightly damaged spine.
Download or read book Bailey s Industrial Oil and Fat Products written by Alton Edward Bailey and published by Wiley-Interscience. This book was released on 1985 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third volume in the most comprehensive reference on modern technical processes involving oil and fat products. Contains new material on fractionation and winterization, margarine shortenings and speciality fats, deodorization/physical refining, instrument analysis and quality control, sensory evaluation, storage, handling and stabilization of finished products and packaging.
Download or read book Chiral Analysis written by Kenneth W. Busch and published by Elsevier. This book was released on 2011-10-13 with total page 721 pages. Available in PDF, EPUB and Kindle. Book excerpt: Chiral Analysis covers an important area of analytical chemistry of relevance to a wide variety of scientific professionals. The target audience is scientific professionals with an undergraduate background in chemistry or a related discipline, specifically organic chemists, researchers in drug discovery, pharmaceutical researchers involved with process analysis or combinatorial libraries, and graduate students in chemistry. Chapters have been written with the nonspecialist in mind so as to be self-contained.* Broad coverage - spectroscopic and separation methods covered in a single volume* Up-to-date and detailed review of the various techniques available and/or under development in this field* Contributions from leading experts in the field
Download or read book Macromolecular Crystallography written by Charles W. Carter and published by Gulf Professional Publishing. This book was released on 1997 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Accurate molecular structures is vital for rational drug design and for structure based functional studies directed toward the development of effective therapeutic agents and drugs. Crystallography can reliably predict structure, both in terms of folding and atomic details of bonding. * Phases * Map interpretation and refinement * Analysis and software.
Download or read book Computational Molecular Spectroscopy written by Per Jensen and published by John Wiley & Sons. This book was released on 2000-11-02 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the use of modern computational methods in predicting high resolution molecular spectra, which allows the experimental spectroscopist to interpret and assign real spectra. * Offers a comprehensive treatment of modern computation techniques. * Provides a collection of material from different areas of theoretical chemistry and physics. * Bridges the gap between traditional quantum chemistry and experimental molecular spectroscopy.
