Download or read book Molecular Beam Studies of the Photodissociation Dynamics of Organometallic Compounds written by Urmi Ray and published by . This book was released on 1988 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Phenomena XI written by Thomas Elsässer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers presented at the Eleventh International Conference on Ultrafast Phenomena held at Garmisch-Partenkirchen, Germany, from July 12 to 17, 1998. The biannual Ultrafast Phenomena Conferences provide a forum for dis cussion of the latest advances in ultrafast optics and their applications in science and engineering. The Garmisch conference brought together a multidisciplinary group of 440 participants from 27 countries, including 127 students. The enthu siasm of this large number of Participants, the high quality of the papers they presented and the magnificent conference site resulted in a successful and pleasant conference. Progress was reported in the technology of generating ultrashort pulses, in cluding new techniques for improving laser-pulse duration, tunability over broad wavelength ranges, output power and peak intensity. Ultrafast spectroscopy con tinues to provide new insight into fundamental processes in physics, chemistry, biology, and engineering. In addition to analyzing ultrafast phenomena, control of ultrafast dynamics now represents an important topic. Ultrafast concepts and tech niques are being applied in imaging and microscopy, high speed optoelectronics, mat~rial diagnostics and processing, reflecting the maturing of the field. Acknowledgements. Many people contributed to the success of the conference.
Download or read book State selected Study of Ion molecule Reaction Dynamics Photodissociation Dynamics and Free Radical Studies Using Synchrotron Radiation written by Tao Zhang and published by . This book was released on 2003 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1993 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Download or read book Structure and Dynamics of Weakly Bound Molecular Complexes written by Alfons Weber and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of weakly bound molecular complexes has in recent years brought this field of investigation to the forefront of physical and chemical research. The scope of the subject is wide and different terminology and nomenclature is current among the various subspecialties. Thus, the term "metal cluster" often connotes to the organic chemist a metal-organic compound, while the physicist will more likely think of groups of metal atoms held together by weak interatomic forces. Aggregates, clusters, complexes, van der Waals molecules, hydrogen-bonded molecules, etc. are terms currently in use, sometimes interchangeably while other times with well defined and mutually exclusive meanings. The subjects of this volume are the free, isolated vim der Waals and hydrogen-bonded molecules. Owing to the present state of experimental knowledge these are mostly dimers, i. e. , entities formed by two strongly bound molecules, an atom and a molecule, or two atoms held together by the weak hydrogen-bonding, or the still weaker van der Waals forces. Weakly bound complexes formed of more than two strongly bound sub-units, i. e. , trimers, tetramers, etc. , are now coming within reachof experimental observation and several papers in this book deal with them. The study of van der Waals and hydrogen-bonded interactions has been pursued for several decades. Most of these ,investigations have, however, dealt with systems in the condensed phase in which bulk effects are commingled with and therefore mask the weak binary interactions.
Download or read book Mechanisms of Reactions of Organometallic Compounds with Surfaces written by D.J. Cole-Hamilton and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: A NATO Advanced Research Workshop on the "Mechanisms of Reactions of Organometallic Compounds with Surfaces" was held in St. Andrews, Scotland in June 1988. Many of the leading international researchers in this area were present at the workshop and all made oral presentations of their results. In addition, significant amounts of time were set aside for Round Table discussions, in which smaller groups considered the current status of mechanistic knowledge, identified areas of dispute or disagreement, and proposed experiments that need to be carried out to resolve such disputes so as to advance our understanding of this important research area. All the papers presented at the workshop are collected in this volume, together with summaries of the conclusions reached at the Round Table discussions. The workshop could not have taken place without financial support from NATO, and donations were also received from Associated Octel, Ltd., STC Ltd., and Epichem Ltd., for which the organisers are very grateful. The organisation of the meeting was greatly assisted by Mrs G. MacArthur and Mr L.R. Dunley of the Chemistry Department, St. Andrews University.
Download or read book Photodissociation Processes in Molecular Beams written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A description is presented of a study of the photodissociation dynamics of molecules in a molecular beam. Photo-fragmentation translational spectroscopy has been utilized to observe the photodissociation dynamics of ozone. Using a supersonic molecular beam and a 10 nanosecond pulsed laser at lambda = 266 nm, the velocities of the fragment products are measured by the method of time of flight. The resolution of the time of flight spectrum of ozone is sufficiently high that the electronic and vibrational states are clearly resolved and identified. Above the threshold (lambda 310 nm), the quantum yield for the production of O(1D) has been estimated in the past to be unity for the process O3 (1A1) + h.nu.)lambda 300 nm) .--. O3(1B2) .--. O2(1.delta./sub g/) + O(1D). However a small production of O2 (3.sigma./sub g/−) + O(3P) has been observed in this study. The O2(1.delta./sub g/) product yields four vibrational states (v = 0, 1, 2, 3) which yields a vibrational temperature of 2700°K along with narrow energy distributions of rotational levels. These energy distributions are compared with photodissociation models along with the polarization dependence of the dissociative process which was also measured. 143 references.
Download or read book Unimolecular Photodissociation Studies in Molecular Beams and Flow Tubes written by Wyatt Gibson Merrill and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We conduct studies utilizing unimolecular photodissociation in two apparatus: (1) a high vacuum molecular beam chamber capable of time-of-flight mass spectrometry and velocity map imaging and (2) a newly constructed high-pressure flow tube apparatus with laser-induced fluorescence detection. Tunable, pulsed ns-laser systems initiate photodissociation in both experiments and probe the resultant products. The molecular beam apparatus resolves quantum-specific product states following CHBrCl2 photodissociation in the Ã-band, leading to CHCl2 and Br photofragments. We use resonance enhanced multiphoton ionization to distinguish between the spin-orbit states of the Br products and velocity map imaging to probe energy disposal at a variety of photolysis wavelengths. We examine the role of electronic surface crossing in the dynamics and relative quantum yields for the exit channels. Additionally, we constructed and characterized a flow tube apparatus designed for measurements of unimolecular kinetics relevant to atmospheric chemistry. The work presented will cover methodology for characterizing fluid dynamics in the flow tube and the laser-induced fluorescence detection capabilities we use to probe products generated in the flow. By varying the transport properties of the flow, we aim to extract rate coefficients for unimolecular processes that compete with bimolecular chemistry in the troposphere under a variety of conditions.
Download or read book Rates of Photon Induced Metal Ion Assisted Unimolecular Decomposition of Gaseous Organometallic Complexes Using a Custom Built Molecular Beam Apparatus written by Scott Jason Dee and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation will focus on the development of a novel technique to study the kinetics and dynamics of transition metal ion assisted [sigma]-bond activation of gaseous organic molecules. The measurements reported represent the first direct experimental determination of reaction kinetics of type: M+ + CnHmCO [right arrow] M+CO + CnHm where M+ represented a transition metal ion and the organic molecule is often a ketone or aldehyde. The dissociation process is activated by the metal ion and such reactions occur with internal energies significantly less than that required to break C-C or C-H single bonds in isolated organic molecules. Determination of the ion/molecule (and the corresponding isotopic variants) reaction rate constants, over ranges of internal energies, yield information about the dynamics of the reaction mechanism. Rate constants are extracted from the photon-induced decomposition of Ni+(Acetone), Ni+(d6-Acetone), and Ni+(Acetaldehyde) into Ni+CO. A custom-built molecular beam apparatus is constructed to study rates of photon-induced unimolecular decomposition of jet-cooled ionic molecular complexes. The complexes are generated in a pulsed system in which a seeded carrier gas entrains liberated metal ions in a supersonic expansion. The metal ions are created through laser ablation of a metal rod at the throat of a supersonic expansion using photons from a KrF GAM Ex5 Excimer laser. The jet-cooled molecular beam is collimated to extract the coldest portion of the molecular beam. The ions in the molecular beam are then orthogonally accelerated down a TOF-MS. Photons intersect the molecular beam prior to orthogonal extraction, resulting in fragmentation of the ionic complexes. A hemispherical kinetic energy analyzer is used to separate these fragmented complexes from their respective precursor complex. Rates of decomposition are extracted from these studies. Direct measurement of the reaction kinetics over a range of energies yields information about the rate-limiting step in the dissociative mechanism. Optimization of the parameters involved in the construction of the molecular beam apparatus will also be discussed.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Photodissociation Dynamics Studies Via Photofragment Translational Spectroscopy written by Niels E. Sveum and published by . This book was released on 2006 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications of the National Institute of Standards and Technology Catalog written by National Institute of Standards and Technology (U.S.) and published by . This book was released on 1987 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laser Chemistry of Organometallics written by J. Chaiken and published by American Chemical Society. This book was released on 1993 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Developed from a symposium sponsored by the Division of Physical Chemistry and the Division of Physical Chemistry and the Division of Inorganic Chemistry, Inc., at the 203rd National Meeting of the American Chemical Society, San Francisco, California, April 5-10, 1992.
Download or read book Molecular Reaction Dynamics written by Raphael D. Levine and published by Cambridge University Press. This book was released on 2009-06-04 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular reaction dynamics is the study of chemical and physical transformations of matter at the molecular level. The understanding of how chemical reactions occur and how to control them is fundamental to chemists and interdisciplinary areas such as materials and nanoscience, rational drug design, environmental and astrochemistry. This book provides a thorough foundation to this area. The first half is introductory, detailing experimental techniques for initiating and probing reaction dynamics and the essential insights that have been gained. The second part explores key areas including photoselective chemistry, stereochemistry, chemical reactions in real time and chemical reaction dynamics in solutions and interfaces. Typical of the new challenges are molecular machines, enzyme action and molecular control. With problem sets included, this book is suitable for advanced undergraduate and graduate students, as well as being supplementary to chemical kinetics, physical chemistry, biophysics and materials science courses, and as a primer for practising scientists.
Download or read book Grants and Awards for the Fiscal Year Ended written by National Science Foundation (U.S.) and published by . This book was released on 1981 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Publications written by United States. National Bureau of Standards and published by . This book was released on 1987 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physical Chemistry of Cold Gas Phase Functional Molecules and Clusters written by Takayuki Ebata and published by Springer. This book was released on 2019-08-02 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes advanced research on the structures and photochemical properties of polyatomic molecules and molecular clusters having various functionalities under cold gas-phase conditions. Target molecules are crown ethers, polypeptides, large size protonated clusters, metal clusters, and other complex polyatomic molecules of special interest. A variety of advanced frequency and time-domain laser spectroscopic methods are applied. The book begins with the principle of an experimental setup for cold gas-phase molecules and various laser spectroscopic methods, followed by chapters on investigation of specific molecular systems. Through a molecular-level approach and analysis by quantum chemical calculation, it is possible to learn how atomic and molecular-level interactions (van der Waals, hydrogen-bonding, and others) control the specific properties of molecules and clusters. Those properties include molecular recognition, induced fitting, chirality, proton and hydrogen transfer, isomerization, and catalytic reaction. The information will be applicable to the design of new types of functional molecules and nanoparticles in the broad area that includes applied chemistry, drug delivery systems, and catalysts.
