Download or read book Infrared Cavity Ringdown Laser Absorption Spectroscopy Metal Containing Clusters and HEDM Molecules written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Efforts focused on four activities related to the central objective of studying metal-containing clusters, HEDM molecules, and clusters of ceramic materials. Nineteen AFOSR supported papers were published on the following topics (including five journal cover articles) : 1) Development of high resolution (100 MHz), high sensitivity pulsed infrared cavity ringdown spectroscopy as a general tool for trace species characterization. 2) Infrared cavity ringdown system with medium (900 MHz) resolution constructed and operational. 3) IR studies of hydrogen bonding in water, methanol, ethanol, and butanol clusters carried out. 4) More difficult IR experiments on laser vaporized carbon and silicon carbide initiated.
Download or read book DURIP97 Infrared Cavity Ringdown Laser Absorption Spectroscopy Metal Containing Clusters and HEDM Molecules written by Richard Saykally and published by . This book was released on 1998 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: A high resolution infrared cavity ringdown laser absorption spectrometer has been developed to study proposed HEDM molecules and metal containing clusters. Using a novel tunable pulsed Alexandrite ring laser, we are able to generate tunable visible radiation with ca, 40 MHz bandwidth. This tunable visible light is downconverted to the infrared using stimulated Raman scattering in H2 and D2. With this system, tunable radiation from the UV to the far infrared can be generated with ca, 100 MHz bandwidth. We will test this system using our pulsed supersonic laser vaporization source to study both metal and carbon containing species. Infrared Cavity Ringdown Spectroscopy has also been used to study water clusters in both pulsed supersonic beams and pulsed discharged nozzles.
Download or read book Cavity ringdown Spectroscopy written by Kenneth W. Busch and published by . This book was released on 1999 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavity-ringdown spectroscopy is an emerging method for making high sensitivity absorption measurements with gas-phase samples. This volume, the first devoted to the method, covers the history, theory, and numerous applications. Written by leaders in the field, it is a comprehensive guide to current methods and ongoing research.
Download or read book Optical Properties of Size selected Supported Metal Clusters Measured by Cavity Ring down Spectroscopy written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Supported size-selected metal clusters have attracted considerable interest due to their special catalytic properties. Optical spectroscopy is a powerful method to characterise the electronic and geometrical properties of such systems. However, observing the optical properties of these small clusters is not trivial and highly sensitive techniques such as cavity ring-down spectroscopy (CRDS), a method previously used to study gas phase samples, are required. An experimental apparatus capable of studying the optical properties of support size-selected metal clusters is presented here for the first time. The metal clusters were prepared using a state-of-the-art laser ablation source, and size selected prior to deposition onto an optically transparent support material. CRDS was adapted for the study of solid samples over an extended wavelength range and used to investigate the size dependent optical properties of supported metal clusters.
Download or read book Cavity Ringdown Spectroscopy of Diatomic Molecules written by Mo-Yee Wong and published by . This book was released on 2017-01-27 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Cavity Ringdown Spectroscopy of Diatomic Molecules" by Mo-yee, Wong, 黃慕儀, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled CAVITY RINGDOWN SPECTROSCOPY OF DIATOMIC MOLECULES Submitted by WONG MO YEE for the degree of Master of Philosophy at The University of Hong Kong in Dec 2006 This thesis reports the study of electronic transitions of yttrium monohalides in the spectral region 460 - 510 nm using the technique of laser ablation/reaction supersonic free jet expansion with cavity ringdown spectroscopy. Transition metal monohalides were generated by reacting laser ablated yttrium metal atoms with ethylbromide and methyliodide. Molecular transition bands (v," v'), with v" = 0 - 3 1 1 + and v' = 0 - 3 of the DΠ - XΣ transition of YBr, and also v" = 0 - 4 and v' = 0 - 7 1 1 + of the DΠ - XΣ transition of YI were obtained and analyzed. Due to small rotational constants for both YBr and YI, rotational structure in these vibronic transitions was not resolved. Rotational constant and band origin for vibronic band were obtained by comparing experimental transition band contour with theoretical band contour simulated using molecular parameters. Equilibrium bond length r (A), vibrational constants (ω ) and rotational constants (B ) determined for the DΠ state e e of YBr and YI are: Parameter Molecule YBr YI T 22028.0 20688.42 246.9 199.2 ω B 0.058 0.0405 r (A) 2.637 2.8187 Molecular orbital energy level diagram for YBr and YI have been constructed to provide understanding of the electronic configurations giving rise to different electronic states. Due to large differences in electronegativity between yttrium and the halogens, the bonding of the YBr and YI studied in this work are basically ionic. A comparison of the electronic states arisen from similar electronic configurations of the monohalides indicates that the halogen ions as a ligand to split the d orbitals of yttrium are strongly halogen dependent and with the order of F >- - - Cl >Br > I . DOI: 10.5353/th_b3871807 Subjects: Diatomic molecules Cavity-ringdown spectroscopy
Download or read book Optical Properties of Size selected Supported Metal Clusters Measured by Cavity Ring down Spectroscopy written by Aras Kartouzian and published by . This book was released on 2010 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Particle like Absorption Spectra in Small Transition Metal Clusters written by and published by . This book was released on 1995 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research at Argonne has found that small clusters of certain transition metal atoms display optical absorption spectra that are fundamentally different from those typically observed for other small molecules. A new laser technique known as photodissociation spectroscopy was used to record the absorption spectra of nickel clusters containing three to seven atoms and of niobium clusters containing between seven and twenty atoms. Instead of displaying spectra with distinct and separate absorption {open_quotes}bands{close_quotes} as is usually seen for small molecules, these metal clusters possess absorption spectra that are continuous and smooth throughout the visible and near ultraviolet regions, indicating that they absorb light at every wavelength. This behavior is in fact more like that displayed by much larger metal particles containing hundreds or thousands of atoms. This surprising result may indicate that the electronic structures of these small clusters are much closer to those of a corresponding macroscopic piece of nickel or niobium metal than was previously thought. These studies are aimed at understanding the electronic structure of the active metal cluster sites in catalysts, and may in addition provide valuable insights into the design and properties of new cluster assembled materials.
Download or read book High Resolution Infrared Absorption Spectroscopy of C60 Molecules and Clusters in Parahydrogen Solids written by and published by . This book was released on 1999 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report the isolation of C60 molecules in cryogenic pH2 solids by the rapid vapor deposition method. New theoretical simulations of rovibrational spectra for low temperature isolated (12)C60 molecules, including boson-exchange symmetry restrictions on the rotational levels, predict a characteristic 'null gap' and unequal rotational line spacings for low-J values. High-resolution(IR)absorption spectra of the C60/pH2 samples failed to show rotationally resolved features, and in fact suggest that the majority of the C60 molecules are not rotating. However, spectra of the F1u(1) vibrational mode near 530 cm( -1) show linewidths of approximately 0.2 cm( -1)(FWHM), the sharpest IR absorption bands for C60 reported to date. Visible absorption spectra also show sharp features in the 600 nm region, supporting our contention of well isolated C60 molecules. The C60 molecules appear to stabilize the pH2 solid, inhibiting the fcc to hcp conversion which usually occurs upon annealing of rapid vapor deposited pH2 solids to T is approximately 5 K. We also report surprisingly strong C60-induced IR activity in the pH2 solid, and propose this phenomenon as a diagnostic for H2 molecules adsorbed by carbon nanotubes. C60/pH2 samples grown in an enclosed cell by laser ablation of solid C60 appear to contain predominantly (C60)n clusters; these clusters are too small to exhibit "bulk" vibrational or electronic properties, as determined by IR and UV/visible absorption spectroscopies. Future experiments to disentangle the contributions of 13C isotopic substitution, pH2 matrix effects, and the putative hindered rotation of C60 molecules to the observed C60/pH2 IR lineshapes are presently under consideration.
Download or read book Proceedings of the High Energy Density Matter HEDM Contractor s Conference Held 4 7 June 1995 in Woods Hole MA written by Patrick G. Carrick and published by . This book was released on 1996 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents the information presented at the Ninth annual High Energy Dwensity Matter (HEDM) Contractors' Conference held 4-7 June 1994 in Woods Hole, MA. This report contains the extended abstracts of the oral, workshops, and poster presentations given by the Air Force funded contractors and by the in-house researchers from the Phillips Laboratory.
Download or read book Emerging Energetic Materials Synthesis Physicochemical and Detonation Properties written by Dabir S. Viswanath and published by Springer. This book was released on 2018-01-02 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes science and technology of a new generation of high-energy andinsensitive explosives. The objective is to provide professionals with comprehensiveinformation on the synthesis and the physicochemical and detonation properties ofthe explosives. Potential technologies applicable for treatment of contaminated wastestreams from manufacturing facilities and environmental matrices are also be included.This book provides the reader an insight into the depth and breadth of theoreticaland empirical models and experimental techniques currently being developed in thefield of energetic materials. It presents the latest research by DoD engineers andscientists, and some of DoD’s academic and industrial researcher partners. The topicsexplored and the simulations developed or modified for the purposes of energetics mayfind application in other closely related fields, such as the pharmaceutical industry.One of the key features of the book is the treatment of wastewaters generated duringmanufacturing of these energetic materials.
Download or read book Cold Molecules written by Roman Krems and published by CRC Press. This book was released on 2009-06-25 with total page 756 pages. Available in PDF, EPUB and Kindle. Book excerpt: The First Book on Ultracold MoleculesCold molecules offer intriguing properties on which new operational principles can be based (e.g., quantum computing) or that may allow researchers to study a qualitatively new behavior of matter (e.g., Bose-Einstein condensates structured by the electric dipole interaction). This interdisciplinary book discusse
Download or read book Manipulating Quantum Systems written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2020-09-14 with total page 315 pages. Available in PDF, EPUB and Kindle. Book excerpt: The field of atomic, molecular, and optical (AMO) science underpins many technologies and continues to progress at an exciting pace for both scientific discoveries and technological innovations. AMO physics studies the fundamental building blocks of functioning matter to help advance the understanding of the universe. It is a foundational discipline within the physical sciences, relating to atoms and their constituents, to molecules, and to light at the quantum level. AMO physics combines fundamental research with practical application, coupling fundamental scientific discovery to rapidly evolving technological advances, innovation and commercialization. Due to the wide-reaching intellectual, societal, and economical impact of AMO, it is important to review recent advances and future opportunities in AMO physics. Manipulating Quantum Systems: An Assessment of Atomic, Molecular, and Optical Physics in the United States assesses opportunities in AMO science and technology over the coming decade. Key topics in this report include tools made of light; emerging phenomena from few- to many-body systems; the foundations of quantum information science and technologies; quantum dynamics in the time and frequency domains; precision and the nature of the universe, and the broader impact of AMO science.
Download or read book Rectenna Solar Cells written by Garret Moddel and published by Springer Science & Business Media. This book was released on 2013-09-16 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rectenna Solar Cells discusses antenna-coupled diode solar cells, an emerging technology that has the potential to provide ultra-high efficiency, low-cost solar energy conversion. This book will provide an overview of solar rectennas, and provide thorough descriptions of the two main components: the diode, and the optical antenna. The editors discuss the science, design, modeling, and manufacturing of the antennas coupled with the diodes. The book will provide concepts to understanding the challenges, fabrication technologies, and materials required to develop rectenna structures. Written by experts in their specialized fields.
Download or read book Prices of Edible Vegetable Oils written by United States. War Industries Board and published by . This book was released on 1919 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Laboratory Directed Research and Development written by Lawrence Livermore National Laboratory and published by . This book was released on 1990 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydrogen Storage Materials written by R. G. Barnes and published by . This book was released on 1988 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ames Laboratory, Iowa, USA
Download or read book Organic Chemistry of Explosives written by Jai Prakash Agrawal and published by John Wiley & Sons. This book was released on 2007-01-11 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt: Organic Chemistry of Explosives is the first text to bring together the essential methods and routes used for the synthesis of organic explosives in a single volume. Assuming no prior knowledge, the book discusses everything from the simplest mixed acid nitration of toluene, to the complex synthesis of highly energetic caged nitro compounds. Reviews laboratory and industrial methods, which can be used to introduce aliphatic C-nitro, aromatic C-nitro, N-nitro, and nitrate ester functionality into organic compounds Discusses the advantages and disadvantages of each synthetic method or route, with scope, limitations, substrate compatibility and other important considerations Features numerous examples in the form of text, reaction diagrams, and tables.
