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Coincidence And Noncoincidence Studies Of The Photodissociation Dynamics Of Free Radicals
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Book Synopsis Coincidence and Noncoincidence Studies of the Photodissociation Dynamics of Free Radicals by : Ann Elise Faulhaber
Download or read book Coincidence and Noncoincidence Studies of the Photodissociation Dynamics of Free Radicals written by Ann Elise Faulhaber and published by . This book was released on 2005 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photodissociaion Dynamics of Neutral Free Radicals by : Bogdan Negru
Download or read book Photodissociaion Dynamics of Neutral Free Radicals written by Bogdan Negru and published by . This book was released on 2012 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photofragment translational spectroscopy was used to study the photodissociation dynamics of the phenyl and tert-butyl radicals. These radicals were produced in a collisionless environment from the flash pyrolysis of the appropriate precursor, nitrosobenzene for phenyl and azo-tert-butane for the tert-butyl radical. The photodissociation dynamics of the phenyl radical (C6H5) were investigated at 248 and 193 nm. At 248 nm, the only dissociation products observed were from hydrogen atom loss, attributed primarily to H + o-C6H4 (ortho-benzyne). The observed translational energy distribution was consistent with statistical decay on the ground state surface. At 193 nm, dissociation to H + C6H4 and C4H3 + C2H2 was observed. The C6H4 fragment can be either o-C6H4 or l-C6H4 resulting from opening of the phenyl ring. The C4H3 + C2H2 products dominate over the two H loss channels. Attempts to reproduce the observed branching ratio by assuming ground state dynamics were unsuccessful. This discord, between the experimentally observed branching ratio and the theoretically predicted branching ratio led us to reinvestigate the dissociation dynamics of the phenyl radical at 193 nm, while producing the radical under different source conditions. The photodissociation dynamics of the tert-butyl radical (t-C4H9) were investigated at 248 nm. Two distinct channels of approximately equal importance were identified: dissociation to H + 2-methylpropene (C4H8), and CH3 + dimethylcarbene (C3H6). Neither the translational energy distributions that describe these two channels nor the product branching ratio are consistent with statistical dissociation on the ground state, and instead favor a mechanism taking place on excited state surfaces. The studies presented in this dissertation show that although hydrogen atom loss is sometimes expected to be the only major dissociation pathway in the photodissociation of hydrocarbon radicals this is not always a justified assumption.
Book Synopsis UV-photodissociation Dynamics of Small Molecules and Free Radicals Studied by High-n Rydberg H-Atom Time of Flight Spectroscopy by : Gabriel Alejandro Amaral
Download or read book UV-photodissociation Dynamics of Small Molecules and Free Radicals Studied by High-n Rydberg H-Atom Time of Flight Spectroscopy written by Gabriel Alejandro Amaral and published by . This book was released on 2001 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photodissociation Spectroscopy and Dynamics of Free Radicals, Clusters, and Ions by :
Download or read book Photodissociation Spectroscopy and Dynamics of Free Radicals, Clusters, and Ions written by and published by . This book was released on 1999 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The photodissociation spectroscopy and dynamics of free radicals and ions is studied to characterize the dissociative electronic states in these species. To accomplish this, a special method of radical production, based on the photodetachment of the corresponding negative ion, has been combined with the technique of fast beam photofragment translational spectroscopy. The photofragment yield as a function of photon energy is obtained, mapping out the dissociative and predissociative electronic states. Branching ratios to various product channels, the translational energy distributions of the fragments, and bond dissociation energies are then determined at selected photon energies. The detailed picture of photodissociation dynamics is provided with the aid of ab initio calculations and a statistical model to interpret the observed data. Important reaction intermediates in combustion reactions have been studied: CCO, C2H5O, and linear C{sub n} (n = 4--6).
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photoisomerization and Photodissociation Dynamics of Reactive Free Radicals by : Ryan Tyler Bise
Download or read book Photoisomerization and Photodissociation Dynamics of Reactive Free Radicals written by Ryan Tyler Bise and published by . This book was released on 2000 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Photodissociation Dynamics and Spectroscopy of Free Radical Combustion Intermediates by :
Download or read book Photodissociation Dynamics and Spectroscopy of Free Radical Combustion Intermediates written by and published by . This book was released on 1996 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: The photodissociation spectroscopy and dynamics of free radicals is studied by the technique of fast beam photofragment translational spectroscopy. Photodetachment of internally cold, mass-selected negative ions produces a clean source of radicals, which are subsequently dissociated and detected. The photofragment yield as a function of photon energy is obtained, mapping out the dissociative and predissociative electronic states of the radical. In addition, the photodissociation dynamics, product branching ratios, and bond energies are probed at fixed photon energies by measuring the translational energy, P(E{sub T}), and angular distribution of the recoiling fragments using a time- and position-sensitive detector. Ab initio calculations are combined with dynamical and statistical models to interpret the observed data. The photodissociation of three prototypical hydrocarbon combustion intermediates forms the core of this work.
Book Synopsis Photoisomerization and Photodissociation Dynamics of Reactive Free Radicals by :
Download or read book Photoisomerization and Photodissociation Dynamics of Reactive Free Radicals written by and published by . This book was released on 2000 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: The photofragmentation pathways of chemically reactive free radicals have been examined using the technique of fast beam photofragment translational spectroscopy. Measurements of the photodissociation cross-sections, product branching ratios, product state energy distributions, and angular distributions provide insight into the excited state potential energy surfaces and nonadiabatic processes involved in the dissociation mechanisms. Photodissociation spectroscopy and dynamics of the predissociative {tilde A}2A1 and {tilde B}2A2 states of CH3S have been investigated. At all photon energies, CH3 + S(3P{sub j}), was the main reaction channel. The translational energy distributions reveal resolved structure corresponding to vibrational excitation of the CH3 umbrella mode and the S(3P{sub j}) fine-structure distribution from which the nature of the coupled repulsive surfaces is inferred. Dissociation rates are deduced from the photofragment angular distributions, which depend intimately on the degree of vibrational excitation in the C-S stretch. Nitrogen combustion radicals, NCN, CNN and HNCN have also been studied. For all three radicals, the elimination of molecular nitrogen is the primary reaction channel. Excitation to linear excited triplet and singlet electronic states of the NCN radical generates resolved vibrational structure of the N2 photofragment. The relatively low fragment rotational excitation suggests dissociation via a symmetric C{sub 2V} transition state. Resolved vibrational structure of the N2 photofragment is also observed in the photodissociation of the HNCN radical. The fragment vibrational and rotational distributions broaden with increased excitation energy. Simple dissociation models suggest that the HNCN radical isomerizes to a cyclic intermediate (c-HCNN) which then dissociates via a tight cyclic transition state. In contrast to the radicals mentioned above, resolved vibrational structure was not observed for the ICNN radical due to extensive fragment rotational excitation, suggesting that intermediate bent states are strongly coupled along the dissociation pathway. The measurements performed in this Thesis have additionally refined the heats of formation and bond dissociation energies of these radicals and have unambiguously confirmed and added to the known electronic spectroscopy.
Book Synopsis Hard X-ray Photoelectron Spectroscopy (HAXPES) by : Joseph Woicik
Download or read book Hard X-ray Photoelectron Spectroscopy (HAXPES) written by Joseph Woicik and published by Springer. This book was released on 2015-12-26 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides the first complete and up-to-date summary of the state of the art in HAXPES and motivates readers to harness its powerful capabilities in their own research. The chapters are written by experts. They include historical work, modern instrumentation, theory and applications. This book spans from physics to chemistry and materials science and engineering. In consideration of the rapid development of the technique, several chapters include highlights illustrating future opportunities as well.
Book Synopsis Modeling Marvels by : Errol G. Lewars
Download or read book Modeling Marvels written by Errol G. Lewars and published by Springer Science & Business Media. This book was released on 2008-12-05 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this highly original book is to survey a number of chemical compounds that some chemists, theoretical and experimental, find fascinating. This is the first book to feature compounds/classes of compounds of theoretical interest that have been studied theoretically but have defied synthesis. It is hoped that this collection of idiosyncratic molecules will appeal to chemists who find the study of chemical oddities interesting and, on occasion, even rewarding.
Book Synopsis Electrospray and MALDI Mass Spectrometry by : Richard B. Cole
Download or read book Electrospray and MALDI Mass Spectrometry written by Richard B. Cole and published by John Wiley & Sons. This book was released on 2011-09-26 with total page 900 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discover how advances in mass spectrometry are fueling new discoveries across a broad range of research areas Electrospray and MALDI Mass Spectrometry brings both veteran practitioners and beginning scientists up to date with the most recent trends and findings in electrospray ionization and matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. In particular, this Second Edition highlights how advances in electrospray and MALDI mass spectrometry are supporting important discoveries in new and emerging fields such as proteomics and metabolomics as well as in traditional areas of chemistry and physics research. Electrospray AND MALDI Mass Spectrometry, SECOND EDITION is divided into five parts: Part A, Fundamentals of ES, explains the fundamental phenomena underlying the electrospray process, including selectivity in ionization and inherent electrochemistry, and concludes with a chapter offering a comparative inventory of source hardware Part B, Fundamentals of MALDI, confronts ionization mechanisms, instrument development, and matrix selection, and includes a final chapter that explores the special application of MALDI to obtain two-dimensional images of spatial distributions of compounds on surfaces Part C, ES and MALDI Coupling to Mass Spectrometry Instrumentation, examines the coupling of these ionization techniques to various mass analyzers, including quadrupole ion trap, time-of-flight, Fourier transform ion cyclotron resonance, and ion mobility mass spectrometers Part D, Practical Aspects of ES and MALDI, investigates analytical issues including quantification, charge-state distributions, noncovalent interactions in solution that are preserved as gas-phase ions, and various means of ion excitation in preparation for tandem mass spectrometry, and offers a guide to the interpretation of even-electron mass spectra Part E, Biological Applications of ES and MALDI, examines the role of mass spectrometry in such areas as peptide and protein characterization, carbohydrate analysis, lipid analysis, and drug discovery Written by a team of leading experts, the book not only provides a critical review of the literature, but also presents key concepts in tutorial fashion to help readers take full advantage of the latest technological breakthroughs and applications. As a result, Electrospray and MALDI Mass Spectrometry will help researchers fully leverage the power of electrospray and MALDI mass spectrometry. The judicious compartmentalization of chapters, and the pedagogic presentation style throughout, render the book highly suitable for use as a text for graduate-level courses in advanced mass spectrometry.
Book Synopsis Modern Trends in Chemical Reaction Dynamics by : Xueming Yang
Download or read book Modern Trends in Chemical Reaction Dynamics written by Xueming Yang and published by World Scientific. This book was released on 2004 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation Provides a detailed picture of the current status of advanced experimental and theoretical research in chemical reaction dynamics. Topics include the Doppler-selected time-of-flight technique, multimass ion imaging, and photodissociation dynamics of free radicals.
Book Synopsis Molecular Spectroscopy by : Jeanne L. McHale
Download or read book Molecular Spectroscopy written by Jeanne L. McHale and published by CRC Press. This book was released on 2017-07-06 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook offers an introduction to the foundations of spectroscopic methods and provides a bridge between basic concepts and experimental applications in fields as diverse as materials science, biology, solar energy conversion, and environmental science. The author emphasizes the use of time-dependent theory to link the spectral response in the frequency domain to the behavior of molecules in the time domain, strengthened by two brand new chapters on nonlinear optical spectroscopy and time-resolved spectroscopy. Theoretical underpinnings are presented to the extent necessary for readers to understand how to apply spectroscopic tools to their own interests.
Book Synopsis Rays of Positive Electricity and Their Application to Chemical Analyses by : Joseph John Thomson
Download or read book Rays of Positive Electricity and Their Application to Chemical Analyses written by Joseph John Thomson and published by . This book was released on 1913 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling by : William A. Cramer
Download or read book Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling written by William A. Cramer and published by Springer. This book was released on 2016-06-14 with total page 763 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Introduction that describes the origin of cytochrome notation also connects to the history of the field, focusing on research in England in the pre-World War II era. The start of the modern era of studies on structure-function of cytochromes and energy-transducing membrane proteins was marked by the 1988 Nobel Prize in Chemistry, given to J. Deisenhofer, H. Michel, and R. Huber for determination of the crystal structure of the bacterial photosynthetic reaction center. An ab initio logic of presentation in the book discusses the evolution of cytochromes and hemes, followed by theoretical perspectives on electron transfer in proteins and specifically in cytochromes. There is an extensive description of the molecular structures of cytochromes and cytochrome complexes from eukaryotic and prokaryotic sources, bacterial, plant and animal. The presentation of atomic structure information has a major role in these discussions, and makes an important contribution to the broad field of membrane protein structure-function.
Book Synopsis Imaging in Chemical Dynamics by : Arthur G. Suits
Download or read book Imaging in Chemical Dynamics written by Arthur G. Suits and published by . This book was released on 2001 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive review of the rapidly growing field of imaging-based probes of chemical dynamics. It includes discussions of state-resolved photodissociation dynamics, orbital alignment and vector correlations, radical photodissociation, surface scattering, imaging photoelectron spectroscopy, ultrafast dynamics and coincidence techniques.
Book Synopsis Quantum Mechanics in Chemistry by : George C. Schatz
Download or read book Quantum Mechanics in Chemistry written by George C. Schatz and published by Courier Corporation. This book was released on 2012-04-30 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced graduate-level text looks at symmetry, rotations, and angular momentum addition; occupation number representations; and scattering theory. Uses concepts to develop basic theories of chemical reaction rates. Problems and answers.
