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Book A Photoionization Study of Cluster Species Present in Gas Vapors and Those Created by Condensation in a Supersonic Molecular Beam

Download or read book A Photoionization Study of Cluster Species Present in Gas Vapors and Those Created by Condensation in a Supersonic Molecular Beam written by James W. Taylor and published by . This book was released on 1976 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This interim report summarizes the results of studies on clusters sampled by and produced through a supersonic molecular beam sampling system. Photoionization cross section measurements were used to calibrate mass spectral ion signals and to study beam discrimination effects. Heats of formation data were obtained for clusters of carbon dioxide, methanol, methanol-d1, ethanol, and trifluoroethanol. (Author).

Book Photoionization Mass Spectrometric Studies of Selected Compounds in a Molecular Beam

Download or read book Photoionization Mass Spectrometric Studies of Selected Compounds in a Molecular Beam written by and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoionization efficiency curves have been measured at moderate to high resolution for several species produced in supersonic molecular beams of acetone, acetone-d6 and CS2. The molecular beam photoionization mass spectrometer which has been assembled for this work is described. The performance of this instrument has been characterized by a number of experiments and calculations.

Book A Photoionization Mass Spectrometry Study of Some Small Molecules Utilization a High Intensity Molecular Beam Sampling System

Download or read book A Photoionization Mass Spectrometry Study of Some Small Molecules Utilization a High Intensity Molecular Beam Sampling System written by Gary Raymond Parr and published by . This book was released on 1973 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1993 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Atomic and Molecular Clusters

Download or read book Atomic and Molecular Clusters written by Elliot R. Bernstein and published by Elsevier Publishing Company. This book was released on 1990 with total page 828 pages. Available in PDF, EPUB and Kindle. Book excerpt: The last fifteen years have seen a veritable explosion of clusters research brought about by two relatively new experimental advances - supersonic jet expansions creating cold high density atomic and molecular beams, and laser (mass and optical) spectroscopy. The success and power of these two techniques, taken together and applied to the study of atomic and molecular clusters, are described in this volume. The field of cluster study is a very broad one, propelled by both the potential application of cluster results to many bulk systems and interest in clusters as systems in their own right. The eclectic nature of the collection of chapters in this book reflects well the diverse nature of this area of chemical physics. The book begins with one of the most suprising and controversial of recent cluster studies - those for the carbon system. As with bulk and molecular carbon chemistry, the chemistry of carbon clusters seems to be unique. Nonmetallic main group clusters also form a very interesting set of systems and their structure and chemistry are as fascinating as they are varied. Diatomic/atomic clusters and small polyatomic clusters demonstrate an incredible amount of spectroscopic detail and thus structure, dynamics and, in some instances, chemistry can be characterized for them. Clusters of larger molecules also yield information on structure, dynamics and chemistry but can in addition give information on changes in molecular structure with degree of solvation. As clusters become larger they begin to assume the properties of bulk systems. Finally, some chapters discuss the nucleation and growth of clusters, each from its own unique perspective and point of view. Current efforts involve following these processes from the formation of a two-molecule cluster to liquid drop. Atomic and Molecular Clusters provides the researcher with a survey of the current status of the field and will also be of interest to the student who may discover a new and exciting area of investigation.

Book Lasers and Mass Spectrometry

Download or read book Lasers and Mass Spectrometry written by David M. Lubman and published by Oxford University Press. This book was released on 1990-04-12 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributors to this volume focus on the fundamentals of the technique of analyzing material based on the atomic weight of the species, using the power and definition of lasers to enable measurement of smaller quantities and more finely localized particles. Each chapter deals with a particular application area and should be sufficient to form an entry point for the utilization of mass spectrometry by graduate students and researchers. The book provides the first full discussion of the new techniques of laser applications in the field.

Book Molecular Beam Mass Spectrometry with Tunable Vacuum Ultraviolet VUV Synchrotron Radiation

Download or read book Molecular Beam Mass Spectrometry with Tunable Vacuum Ultraviolet VUV Synchrotron Radiation written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Tunable soft ionization coupled to mass spectroscopy is a powerful method to investigate isolated molecules, complexes and clusters and their spectroscopy and dynamics.[1-4] Fundamental studies of photoionization processes of biomolecules provide information about electronic structure of these systems. Furthermore determinations of ionization energies and other properties of biomolecules in the gas phase are not trivial, and these experiments provide a platform to generate these data. We have developed a thermal vaporization technique coupled with supersonic molecular beams that provides a gentle way to transport these species into the gas phase. Judicious combination of source gas and temperature allows for formation of dimers and higher clusters of the DNA bases. The focus of this particular work is on the effects of non-covalent interactions, i.e., hydrogen bonding, stacking, and electrostatic interactions, on the ionization energies and proton transfer of individual biomolecules, their complexes and upon micro-hydration by water.[1, 5-9] We have performed experimental and theoretical characterization of the photoionization dynamics of gas-phase uracil and 1,3-methyluracil dimers using molecular beams coupled with synchrotron radiation at the Chemical Dynamics Beamline[10] located at the Advanced Light Source and the experimental details are visualized here. This allowed us to observe the proton transfer in 1,3-dimethyluracil dimers, a system with pi stacking geometry and with no hydrogen bonds[1]. Molecular beams provide a very convenient and efficient way to isolate the sample of interest from environmental perturbations which in return allows accurate comparison with electronic structure calculations[11, 12]. By tuning the photon energy from the synchrotron, a photoionization efficiency (PIE) curve can be plotted which informs us about the cationic electronic states. These values can then be compared to theoretical models and calculations and in turn, explain in detail the electronic structure and dynamics of the investigated species [1, 3].

Book Molecular Beam Experiments Involving Halon Clusters

Download or read book Molecular Beam Experiments Involving Halon Clusters written by D. L. Arneberg and published by . This book was released on 1990 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The system of Halon 1301 (CF[3BR) and molecular oxygen (O[2) were carefully studied. Small, isolated molecular clusters of Halon 1301 and the oxygen-atom, flame free radical precursor O[2 were formed in a supersonic molecular beam, and chemical reactions were initiated within the clusters by dissociative photoionization. The fragments formed were identified by mass spectrometry, and the ionization and appearance potentials for many of the species in this binary system were determined. The most striking result is the inability to detect oxygenated fragments of dissociative photoionization of the complex CF[3BR x O[2. The results hold important mechanistic implications for the role of CF[3Br in fire extinguishment and in guiding the search for alternative firefighting agents.

Book Vacuum Ultraviolet Photoionization and Photodissociation of Molecules and Clusters

Download or read book Vacuum Ultraviolet Photoionization and Photodissociation of Molecules and Clusters written by Cheuk-Yiu Ng and published by World Scientific. This book was released on 1991 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt: This monograph reviews the recent progress in vacuum ultraviolet (VUV) photoionization and photodissociation processes. Photoionization, photoelectron, and fluorescence spectroscopic techniques have played an important role in revealing the photoionization and photodissociation dynamics of molecules in the vacuum ultraviolet region and in providing accurate energetic and spectroscopic information of ions as well as neutral molecules. The book represents the first detailed review of major experimental developments in the studies of single vacuum ultraviolet photon ionization and dissociation processes of gaseous molecules and clusters.

Book Physics and Chemistry of Small Clusters

Download or read book Physics and Chemistry of Small Clusters written by P. Jena and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in experimental techniques now enable researchers to produce in a laboratory clusters of atoms of desired composition from any of the elements of the periodic table. This has created a new area of research into novel materials since clusters cannot be regarded either as a "large" molecule or as a fragment of the bulk. Both experimental and theoretical studies are revealing unusual properties that are not ob served in solid state environments. The structures of micro-clusters are found to be significantly distorted from the most symmetric arrangement, some even exhibiting pentagonal symmetry commonly found in icosahedric structures. The unusual stability of certain clusters, now described as "magic number species", shows striking similarities with the nuclear shell structure. The relative stabilities of clusters depend not only on the composition of the clusters but also on their charged states. The studies on spontaneous fragmentation of mUltiply charged clusters, commonly referred to as Coulomb explosion, illustrate the role of electronic bonding mechanisms on stability of clusters. The effect of foreign atoms on geometry and stability of clusters and the interaction of gas atoms with clusters are showing promise for an indepth understanding of chemisorption and catalysis. The magnetic and optical properties are dependent not only on cluster size but also on its geometry. These findings have the potential for aiding industry in the area of micro-electronics and catalysis.

Book Journal of Research of the National Bureau of Standards

Download or read book Journal of Research of the National Bureau of Standards written by United States. National Bureau of Standards and published by . This book was released on 1988 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Life And Scientific Legacy Of George Porter

Download or read book The Life And Scientific Legacy Of George Porter written by David Phillips and published by World Scientific. This book was released on 2006-07-07 with total page 654 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sir George Porter (Lord Porter of Luddenham) was one of the most highly regarded and well known scientists in Britain. He was appointed Director of the Royal Institution in 1966, awarded a Nobel Prize in Chemistry in 1967, and was the only Director of the Royal Institution to later become President of the Royal Society (1985-1990). Porter had a marvellous gift for communicating his infectious enthusiasm for science, and as President of the Royal Society, he worked hard to improve the status of science, and employed his communication skills ably in the defence of British science under attack from inadequate government funding, of which he was fiercely critical.It was for his work on flash photolysis in Cambridge that ultimately led him to win the Nobel Prize. Together with Ronald Norrish and Manfred Eigen, he shared the 1967 Nobel Prize for Chemistry, for their work on techniques for observing and studying extremely fast chemical reactions during the processes of combustion, explosion and chain reaction.In this volume, his peers, former colleagues, students and friends — themselves highly regarded and well known scientists in their own right — come together to honour and celebrate the enormous contributions of this man. They comment on their respective personal and working relationships with Porter and on his work.The contributors include Mary Archer (University of Cambridge, UK), James Barber (Imperial College London, UK), Godfrey Beddard (University of Leeds, UK), Graham Fleming (University California, Berkeley, USA), Michael George (University of Nottingham, UK), Anthony Harriman (University of Newcastle Upon Tyne, UK), David Klug (Imperial College London, UK), Harry Kroto (University of Sussex, UK), Edward Land (Keele University, UK), A J MacRobert (University of College London, UK), David Phillips (Imperial College London, UK), Martyn Poliakoff (University of Nottingham, UK), F Sherwood Rowland (University of California, Irvine, USA), Brian Thrush (University of Cambridge, UK), George Truscott (Keele University, UK), James Turner (University of Nottingham, UK), Barry Ward (UK), Frank Wilkinson (Loughborough University of Technology, UK), Keitaro Yoshihara (Japan Advanced Institute of Science and Technology, Japan), and Ahmed Zewail (California Institute of Technology, USA)./a

Book Energy Research Abstracts

Download or read book Energy Research Abstracts written by and published by . This book was released on 1994 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: