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).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Photoionization Study of Cluster Species in a Supersonic Molecular Beam written by James W. Taylor and published by . This book was released on 1982 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes the research designed to explore the heats of formation of van der Waals and hydrogen bonded clusters which are present at low pressures in the nozzle chamber of a supersonic molecular beam. Data are reported on equilibria, ionization, cross sections, and fragmentation for monomers and clusters of CO2, alcohols, ammonia, acetic acid, nitriles and water. (Author).
Download or read book Government Reports Annual Index written by and published by . This book was released on 1978 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the International Conference on X ray and XUV Spectroscopy Sendai August 28 September 1 1978 written by and published by . This book was released on 1978 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1978-01-06 with total page 308 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 1983 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1976 with total page 1052 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book R D Abstracts written by Technology Reports Centre (Great Britain) and published by . This book was released on 1978 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book INIS Atomindeks written by and published by . This book was released on 1981 with total page 1112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1983 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Physics Briefs written by and published by . This book was released on 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1992 with total page 860 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Molecular Beam Photoionization Studies of Molecules and Their Van Der Waals Clusters written by Yoshi Ono and published by . This book was released on 1982 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cold Chemistry written by Olivier Dulieu and published by Royal Society of Chemistry. This book was released on 2017-12-06 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent years have seen tremendous progress in research on cold and controlled molecular collisions, both in theory and in experiment. The advent of techniques to prepare cold and ultracold molecules and ions, to store them in optical lattices or in charged quasicristalline structures, and to use them in crossed or merged beam experiments have opened many new possibilities to study the most fundamental aspects of molecular interactions. At the same time, theoretical work has made progress in tackling these problems and accurately describing quantum effects in complex systems, and in proposing viable options to control chemical reactions at ultralow energies. Through tutorials on both the theoretical and experimental aspects of research in cold and ultracold molecular collisions, this book provides advanced undergraduate students, graduate students and researchers with the foundations needed to understand this exciting field.
Download or read book Photoionization of Rare Gas Clusters written by Huaizhen Zhang and published by . This book was released on 2009 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis concentrates on the study of photoionization of van der Waals clusters[sic] with different cluster sizes. The goal of the experimental investigation is to understand the electronic structure of van der Waals clusters and the electronic dynamics. These studies are fundamental to understand the interaction between UV-X rays and clusters. The experiments were performed at the Advanced Light Source at Lawrence Berkeley National Laboratory. The experimental method employs angle-resolved time-of-flight photoelectron spectrometry, one of the most powerful methods for probing the electronic structure of atoms, molecules, clusters and solids. The van der Waals cluster photoionization studies are focused on probing the evolution of the photoelectron angular distribution parameter as a function of photon energy and cluster size. The angular distribution has been known to be a sensitive probe of the electronic structure in atoms and molecules. However, it has not been used in the case of van der Waals clusters. We carried out outer-valence levels, inner-valence levels and core-levels cluster photoionization experiments. Specifically, this work reports on the first quantitative measurements of the angular distribution parameters of rare gas clusters as a function of average cluster sizes. Our findings for xenon clusters is that the overall photon-energy-dependent behavior of the photoelectrons from the clusters is very similar to that of the corresponding free atoms. However, distinct differences in the angular distribution point at cluster-size-dependent effects were found. For krypton clusters, in the photon energy range where atomic photoelectrons have a high angular anisotropy, our measurements show considerably more isotropic angular distributions for the cluster photoelectrons, especially right above the 3d and 4p thresholds. For the valence electrons, a surprising difference between the two spin-orbit components was found. For argon clusters, we found that the angular distribution parameter values of the two-spin-orbit components from Ar2p clusters are slightly difference. When comparing the [Beta] values for Ar between atoms and clusters, we found different results between Ar 3s atoms and clusters, and between Ar 3p atoms and clusters. Argon cluster resonance from surface and bulk were also measure. Furthermore, the angular distribution parameters of Ar cluster photoelectrons and Ar atom photoelectrons in the 3s [rightwards arrow] np ionization region were obtained.
Download or read book The Supersonic Project Supersonically Induced Gas Objects in the Early Universe written by Yeou Shya Chiou and published by . This book was released on 2020 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The puzzling origins of globular clusters have been greatly debated over the years. We present a new formation channel for globular clusters, linking them to objects that formed without dark matter (DM) in the early Universe in the presence of a supersonic relative velocity between baryons and DM. This stream velocity arises due to the drop in radiation pressure of baryons from matter-radiation decoupling and induces a physical separation between baryonic and DM overdensity peaks. This effect gives rise to gas dominant objects with little to no DM. These gas-rich structures, called Supersonically Induced Gas Objects (SIGOs), form naturally outside of DM halos as a consequence of the stream velocity. In this thesis, we present a detailed investigation of the physical properties of SIGOs, which leads to a promising connection to globular clusters. One of the physical parameters often invoked to understand galaxy formation is the spin parameter of halos, which characterizes galaxies' rotational structure. We, thus, first investigate the spins of DM halos and SIGOs with stream velocity. We find that the spin parameter of DM halos follows a lognormal distribution, and the median increases and the misalignment angle between the angular momenta of baryons and DM has a nearly isotropic distribution. We generalize the spin parameter to SIGOs and find that they also have a lognormal distribution. Furthering existing hydrodynamic AREPO simulations by including radiative cooling, we find that this cooling channel has negligible effects on SIGO properties compared to only adiabatic cooling. We find that SIGOs density is high enough to allow stars to form using a simple density threshold criterion based on the balance of gravity and thermal/turbulent energy. Then, we model the star formation process and estimate the luminosity of the first star clusters within a SIGO. We find that SIGOs occupy a different part of the luminosity-mass parameter space than classical DM halos with gas. We further adopt a simple model to evolve the SIGOs to present-day and show that their masses, radii, and luminosities are consistent with present-day (local) globular clusters. Since the stream velocity is coherent over scales of a few Mpc, we predict that if this is the dominant mechanism for globular clusters, the abundances of galaxies hosting global clusters vary significantly over these scales. The upcoming James Webb Space Telescope will elucidate the mysteries of the first galaxies and will further shed light on the link between SIGOs as progenitors to globular clusters.
