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Tesis sobre el tema "Molecular hydrogen"

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Publicado: 4 de junio de 2021
Última modificación: 25 de julio de 2025

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1

Wilkinson, David Adam. "Molecular hydrogen in galaxies." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6657/.

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This study aims to understand the key role played by molecular hydrogen in the evolution of galaxies, with a view to constraining its radial distribution in the Galaxy and the CO→H(_2) conversion factor α(_20).The star formation rate is shown to be correlated with the surface density of H(_2). A correlation between the molecular hydrogen fraction and the metallicity of a region allows the time evolution of H(_2) to be described. This leads to a modified 'Schmidt Law' of the SFR which explains quite naturally the production of galactic metallicity gradients and the constancy of the SFR in the a
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2

Li, Chengguang. "Molecular hydrogen in planetary nebulae." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0027/MQ31359.pdf.

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3

Gatti, Francesco Gilberto. "Hydrogen bond-assembled molecular shuttles." Thesis, University of Warwick, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247443.

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4

Pérez, Emilio M. "Hydrogen-bonded synthetic molecular machines." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/15610.

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This thesis reports on: 1) the development of two new methods to provoke the translation of the macrocycle along the thread (“shuttling”) in hydrogen bonded, fumaramide-based [2]rotaxanes and 2) the utilization of that movement to provoke a potentially useful response. The fumaramide template is perfectly preorganised to form four intercomponent hydrogen bonds with a benzylic amide macrocycle, affording [2]rotaxanes in “world record” yields. This preorganisation can be disrupted by photo-isomerisation (254 nm) of the E double bond to its Z counterpart. The newly formed maleamide template shows
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5

Onay, Aytun. "Hydrogen Storage Capacity Of Nanosystems: Molecular." Master's thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609636/index.pdf.

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In recent decades, tremendous efforts have been made to obtain high hydrogen storage capacity in a stable configuration. In the literature there are plenty of experimental works investigating different materials for hydrogen storage and their storage values. In the first part of this thesis the available literature data have been collected and tabulated. In addition to the literature survey the hydrogen storage capacity of carbon nanotubes and carbon nanotubes doped with boron nitride (CBN nanotubes) with different chirality have been investigated by performing quantum chemical methods at semi
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6

Montgomerie, Christine Ann. "Spectroscopy of the hydrogen molecular ion." Thesis, University of Oxford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.257936.

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7

Guest, Michael Arthur. "The infrared spectrum of molecular hydrogen." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315022.

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8

Ray, Mark D. "Precision Lifetime Measurements in Molecular Hydrogen /." The Ohio State University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487931512617771.

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9

Chen, Guo Fu. "The diffusion of muonic hydrogen atoms in hydrogen gas." W&M ScholarWorks, 1990. https://scholarworks.wm.edu/etd/1539623790.

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This experiment measured the time distribution of muonic hydrogen atoms which were formed when negative muons were brought to rest in H{dollar}\sb2{dollar} gas, containing Au target foils, at five pressures (750 mbar, 375 mbar, 188 mbar, 94 mbar and 47 mbar at 4.6 mm foil spacing). A Monte Carlo method is applied for deducing the initial velocity distribution, and preliminary results are obtained. The initial velocity distribution of {dollar}\mu{dollar}H atoms is reasonably well described as a 'Maxwellian' velocity distribution with a mean energy E = 3.4 eV. The corresponding muon mean capture
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10

Chrysostomou, Antonio. "Molecular hydrogen line emission from photodissociation regions." Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/27794.

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The work presented in this thesis is dedicated to the study of the physical properties of photodissociation regions (PDRs), the surface layers of molecular clouds which are irradiated by ultraviolet radiation. The structure of PDRs is investigated with the development of an analytical model which incorporates the essential heating and cooling mechanisms in a PDR. The main parameters in the model are the density and the incident ultraviolet radiation field, above the ambient value in the solar neighbourhood, impinging on the surface (G<SUB>0</SUB>) which dissociates the molecules in the PDR. It
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11

Tedds, Jonathan Andrew. "Shocked molecular hydrogen in the Orion "bullets"." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/27519.

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The physics of shocked outflows in molecular clouds is one of the fundamental astrophysical processes by which the cycle of star formation in our Galaxy is regulated. I outline the basis of our understanding of the star formation process and the violent outflow always associated with it, the physics of shocks in molecular gas, and the consequent excitation of molecular hydrogen (H<SUB>2</SUB>). It is demonstrated that molecular hydrogen is the best observational diagnostic of this hot, shocked molecular gas and an introduction is given to the observational techniques of near-infrared spectrosc
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12

Theobald, James Andrew. "Self-assembly of hydrogen-bonded molecular traps." Thesis, University of Nottingham, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416730.

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13

Gerst, Steven Gregory. "The deuterium content of atmospheric molecular hydrogen /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/11551.

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14

Undurti, Sainadh. "`Attoclock' experiments on atomic and molecular hydrogen." Thesis, Griffith University, 2018. http://hdl.handle.net/10072/381373.

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The current thesis aims at benchmarking strong- eld physics with the help of precision measurements performed on the simplest atomic (H) and molecular (H2) systems. The importance of H in validating strong- eld models is demonstrated through the rst set of experimental data. It aims at calibrating the absolute Carrier-envelope phase (CEP) of few-cycle laser pulses using H against complete ab initio solution of the three dimensional time-dependent Schr odinger equation (3D-TDSE). Subsequent set of measurements with noble gases against widely used strong- eld models based on single-active elect
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15

Pejlovas, Aaron Matthew. "Microwave Spectra and Molecular Structures of Organic Molecules and Hydrogen Bonded Dimers." Thesis, The University of Arizona, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10748431.

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<p> The microwave spectra were measured in the 4&ndash;15 GHz regime for cyclopropanecarboxylic acid, 1,2-cyclohexanedione, maleimide, phthalimide, and 4a,8a-azaboranaphthalene. Doubly hydrogen bonded dimers formed with formic acid were also measured with the molecules cyclopropanecarboxylic acid, 1,2-cyclohexanedione, maleimide, and tropolone. Measurements were made using a pulsed beam Fourier transform microwave spectrometer. Rotational and centrifugal distortion constants were determined from the microwave spectra. In the case of the systems that exhibit electric quadrupole coupling interac
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16

Willis, Peter G. "DESIGNING MOLECULAR RECOGNITION IN THE CONTEXT OF HYDROGEN BONDING AND MOLECULAR DYNAMICS." UKnowledge, 2001. http://uknowledge.uky.edu/gradschool_diss/279.

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The effect of hydrogen bonding on the conformation of organic moleculesunifies two projects in this thesis. In one project, the stability of the intramolecularhydrogen bond in derivatives of 2-guanidinobenzimidazole was studied bydynamic 1H NMR spectrometry. The impact that this intramolecular hydrogenbond had on the bond order of the neutral guanidino group and on the dynamicconformation of these aromatic structures was related to the concept of hydrogenbond-assisted resonance. In another project, an oligomer possessing repetitiveconformation and capable of much inter- and intramolecular hydr
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17

Galamba, Joseph. "Model of the One-Dimensional Molecular Hydrogen Cation." Oberlin College Honors Theses / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1337904721.

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18

Kreckel, Holger. "Internal excitations of stored triatomic hydrogen molecular ions." [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=968519563.

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19

Mileeva, Zhanna. "Production and characterisation of molecular hydrogen storage materials." Thesis, University of Salford, 2011. http://usir.salford.ac.uk/26818/.

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The subject of the present work is the characterization of potential materials for molecular hydrogen storage with a stress on the use of Small Angle Neutron Scattering (SANS). This research is dedicated mainly to a study of the porous structure of activated carbon. Employment of the contrast matching technique together with SANS led to an understanding of the process of pore filling resulting from an increase of partial pressure of contrast matching liquid (deuterated toluene). The Author has designed a special Al alloy sample cell for the variable vapour pressure SANS experiments. The access
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20

Miao, Ling. "Molecular simulations of Pd based hydrogen sensing materials." [Tampa, Fla] : University of South Florida, 2006. http://purl.fcla.edu/usf/dc/et/SFE0001773.

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21

Walker, Martin. "A computational study of hydrogen-bonded molecular crystals." Thesis, University of Edinburgh, 2007. http://hdl.handle.net/1842/1557.

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The current climate in research has focused on the rational design of new materials with desirable characteristics. The demand for their full characterisation has in turn placed a new importance on structural chemistry, and important developments have taken place as a consequence. For instance an important probe to understand the interactions between molecules is to use variable pressure, and this has been exploited experimentally through the design and implementation of the diamond anvil compression cell (DAC). Using a DAC to study molecular materials at high pressure can result in problems,
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22

Trevisan, Cynthia Sandra. "Near threshold electron impact dissociation of molecular hydrogen." Thesis, University College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.397950.

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23

Murata, Michihisa. "Organic synthesis of endohedral fullerenes encapsulating molecular hydrogen." 京都大学 (Kyoto University), 2006. http://hdl.handle.net/2433/64942.

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24

Wang, Liang-Guo. "Studies of Rydberg atomic xenon and molecular hydrogen /." The Ohio State University, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487323583622812.

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25

CECCONI, BIANCA. "Artificial Photosynthesis: Molecular Approaches for Photocatalytic Hydrogen Production." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2016. http://hdl.handle.net/10281/100472.

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The humankind today needs to face an epochal transition from a fossil fuel to a renewable source-based economy. Renewable sources are our chance to build a clean world with unlimited and widespread energy. Nowadays renewable energies could be properly harvested to produce electricity, while the development of a future clean fuel is less advanced. Since our energetic consumption is made essentially of fuels we need to build devices to transform renewable energy, such as solar radiation, into chemical energy of bonds. A promising future fuel is hydrogen since its carbon footprint is zero and it
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26

Smith, Susan Lavinia. "Chiral selection in hydrogen atom transfer reactions." Thesis, Royal Holloway, University of London, 1986. http://repository.royalholloway.ac.uk/items/f4ae87be-b444-42db-828c-b12089967742/1/.

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This thesis describes an attempt to demonstrate enantioselectivity in free-radical hydrogen transfer reactions and was designed to test a novel extension of the Hammond Postulate. It is proposed that the rates of two related reactions which are thermodynamically identical but kinetically distinct should differ most when the processes are thermoneutral since the transition state is remote from both reactant and product. Bysynthesis and subsequent oxidation of suitable chiral hydroxamic acids a series of persistent chiral acyl nitroxide radicals ArCON(R)O has been made. By reacting such a series
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27

Axelsson, Rikard. "Cyanobacterial Hydrogen Metabolism : Transcriptional Regulation of the Hydrogenases in Filamentous Strains." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-3590.

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28

Hunt, Maria, University of Western Sydney, of Science Technology and Environment College, and School of Engineering and Industrial Design. "Molecules in southern molecular clouds: a millimetre-wave study of dense cores." THESIS_CSTE_EID_Hunt_M.xml, 2001. http://handle.uws.edu.au:8081/1959.7/116.

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This thesis presents an observational study of molecular abundances in the dense cores of 27 prominent molecular clouds in the southern galactic plane.The molecular abundances and physical conditions in dense condensations have been derived from millimetre-wavelength observations of molecular rotational transitions.The study has produced a comprehensive data set of transition intensities and abundances for 10 different molecules in bright southern molecular clouds, and the general characteristics of emissions from these molecules such as optical depth, excitation and relative abundances are di
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29

Nalbantoglu, Tugrul. "Towards a hydrogen bond mediated directional walker and light driven molecular shuttles." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/towards-a-hydrogen-bond-mediated-directional-walker-and-light-driven-molecular-shuttles(fb210b38-4079-4376-942e-b907a8f82d3f).html.

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This thesis reports the efforts towards the design and synthesis of a small molecule walker that would potentially move along the track directionally by exploiting the secondary interactions between the track and the walker. This thesis also reports the synthesis and operation of a light driven molecular shuttle featuring a novel acylpyridyl hydrazone station. Chapter One describes the biological walkers which are the source of inspiration towards the synthetic walkers, characteristics of a walker, previously described small molecule walkers and recent progress on the synthesis of molecular sh
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30

Mccartney, Michael Stephan Karl. "Fluorescent molecular hydrogen in the reflection nebula NGC 2023." Thesis, University of Edinburgh, 1998. http://hdl.handle.net/1842/28563.

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Photodissociation regions (PDRs) are described in the context of the interstellar medium and star-forming regions. Observations of PDRs and molecular hydrogen are reviewed and the reflection nebula NGC 2023 is discussed in detail. NGC 2023 is a bright and well-studied reflection nebula at a distance of 450 parsecs in the Orion region. Illuminated primarily by a B-type star, it offers an ideal opportunity to study UV-excited molecular hydrogen. The theory of the hydrogen molecule is described: the energy states and their relationship with the quantum numbers which represent the vibratinal and r
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31

Carr, James M. "Low energy positron scattering from the hydrogen molecular ion." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363939.

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32

Conroy-Lewis, F. M. "Synthesis and reactivity of molecular hydrogen complexes of ruthenium." Thesis, University of Salford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381680.

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33

Boissonnet, Michel-Franck. "Hydrogen-bonding ferrocene derivatives for molecular recognition and organocatalysis." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/6121/.

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The aim of this project was to prepare novel ferrocene-based Hydrogen-bonding receptors and to study them in the electrochemical sensing of neutral compounds and in organocatalysed transformations. The synthesis and characterisation of 2-ferrocenyl oxazoles via gold chemistry to access a new H-bonding motif for electrochemical sensing was successfully achieved. However the targeted structure bearing a secondary amine at the 4-position of the oxazole, was found to be highly unstable and unsuitable for sensing applications. Further studies on ferrocene-based H-bonding systems towards their appli
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34

Islam, F. "The formation of molecular hydrogen in the interstellar medium." Thesis, University College London (University of London), 2010. http://discovery.ucl.ac.uk/19475/.

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H2 is the most abundant molecule in the interstellar medium and forms on the surface of interstellar dust grains. Laboratory studies have been conducted of HD formation on a dust grain analogue, which is a highly-oriented pyrolytic graphite surface held at 15 K, under ultra-high vacuum. The molecules desorb from the surface in a distribution of ro-vibrational states, which are probed using Resonance Enhanced Multi-Photon Ionization Spectroscopy. HD in a particular ro-vibrational state is ionized using laser photons detected by a time-of-flight mass spectrometer. The HD+ ion yields are then dat
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35

Garfitt, Jason Michael. "Hydrogen bonding and covalent coupling in adsorbed molecular monolayers." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/27728/.

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This thesis examines multiple different molecular networks adsorbed on several different substrates, namely, highly oriented pyrolytic graphite (HOPG), Au(111) and graphene. STM investigations into hydrogen-bonded structures formed by closely related tetracarboxylic acid molecules were performed. The molecule pterphenyl-3,5,3,5-tetracarboxylic acid (TPTC), which is known to form random tiling networks, was observed on a graphene on copper substrate. The network formed from deposition of TPTC from nonanoic acid was examined statistically. Aqueous solutions of TPTC were also examined on HOPG whe
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36

Schiavi, Andrea. "Investigation of vibrating-hydrogen based ultrashort molecular phase modulator." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:94c3e831-9045-4d32-acc3-5ef7c6bca135.

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This thesis investigates the coherent phase modulation of ultrashort pulses using vibrating hydrogen as a molecular medium. Self-phase modulation in a gas-filled hollow core capillary allows the generation of highpower few-cycle pulses in the NIR. Such pulses can be used to drive high harmonic generation (HHG) to deliver attosecond duration pulses in the extreme ultraviolet and soft X-ray spectral region. While reaching unrivalled pulse durations (down to 67 as), these sources have characteristically low efficiencies. The pump-probe spectroscopy community would greatly benefit from brighter sh
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37

Garrett, Benjamin R. "MoO(S2)2L Based Molecular Electrocatalysts for Hydrogen Production." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1490964132615695.

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38

Irving, Benjamin James. "The formation of molecular hydrogen in the interstellar medium." Thesis, University of Sheffield, 2012. http://etheses.whiterose.ac.uk/3104/.

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39

Clark, Jessica Higgins Deseret. "The ortho to para transition in muonic molecular hydrogen." W&M ScholarWorks, 2002. https://scholarworks.wm.edu/etd/1539623408.

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A precise measurement of the induced weak pseudoscalar coupling constant of the proton, gp, is of interest as a basic test of chiral symmetry breaking. This is the least well-known weak form factor of the nucleon. Muon capture experiments [Jonkmans et al., Phys. Rev. Lett. 77(1996)4512] have been used to measure gp. However, the interpretation of these muon capture experiments requires knowledge of the relative population of the muonic atomic and molecular states for muons in liquid hydrogen. In particular, lambda op, the transition rate between the ortho- and para-molecular states of the pmup
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40

Vanne, Yulian V. "Ionization of molecular hydrogen in ultrashort intense laser pulses." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2010. http://dx.doi.org/10.18452/16107.

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Ein neuer numerischer ab initio Ansatz wurde entwickelt und zur Lösung der zeitabhängigen Schrödingergleichung für zweiatomig Moleküle mit zwei Elektronen (z.B. molekularer Wasserstoff), welche einem intensiven kurzen Laserpuls ausgesetzt sind, angewandt. Die Methode basiert auf der Näherung fester Kernabstände und der nicht-relativistischen Dipolnäherung und beabsichtigt die genaue Beschreibung der beiden korrelierten Elektronen in voller Dimensionalität. Die Methode ist anwendbar für eine große Bandbreite von Laserpulsparamtern und ist in der Lage, Einfachionisationsprozesse so
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41

Woodman, George Henry. "Precise laser spectroscopy of atomic hydrogen." Thesis, University of Oxford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316894.

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42

Frost, Mungo David. "Simple molecular systems under pressure." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/25788.

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Under pressure small molecular systems exhibit a remarkable degree of polymorphism and unexpected behaviours. Two previously unexplored binary systems, those of niobium{hydrogen and water{oxygen, are explored and their phase diagrams mapped. In the case of water and oxygen, two hitherto unknown clathrate structures are found. A wide study of dense nitrogen at and above room temperature is also reported. The phase diagram of nitrogen is exceptionally complex for a single element and exhibits considerable metastability of phases. Current theoretical understanding of nitrogen has many disagreemen
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43

Pohl, Vincent [Verfasser]. "Electronic Motion in Molecular Systems: From the Hydrogen Molecular Ion to Nanostructures / Vincent Pohl." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1144270278/34.

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44

Shaw, John A. "Photoabsorption spectra of hydrogen in magnetic fields." W&M ScholarWorks, 1993. https://scholarworks.wm.edu/etd/1539623837.

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Measurements of the absorption spectrum of atomic H in strong magnetic fields have been analyzed. The measurements, performed by the Bielefeld, Germany experimental group, investigated the photoabsorption to levels near the ionization threshold in magnetic fields ranging from 2.7 to 6 Tesla. Taking advantage of a classical scaling law, the photon energy and the magnetic field strength were varied simultaneously in the experiment and the absorption rate vs. B{dollar}\sp{lcub}-1/3{rcub}{dollar} at fixed scaled-energy, {dollar}\varepsilon{dollar} = E/(B/B{dollar}\sb{lcub}\rm o{rcub})\sp{lcub}2/3{
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45

Steel, Stephen Chris. "Magnetic resonance studies of atomic hydrogen confined by solid molecular hydrogen between 6.4 and 8.2 k." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25046.

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Magnetic hyperfine resonance in zero magnetic field has been used to study atomic hydrogen gas confined by walls coated with solid molecular hydrogen at temperatures between 6.4 and 8.2 K. The temperature range of the experiments was limited by the nature of the atom source used to produce atoms. Measurements of the frequency shift at low atom densities (nH ≃ 8 x l0⁺¹⁶ m⁻³) have yielded a binding energy for H on H₂ of 34.04 ± 0.26 K, and a surface frequency shift of -1.16 ± 0.05 MHz. These results are in excellent agreement with those obtained by Crampton et al between 3.2 and 4.5 K. The pres
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46

Banu, Ana Maria. "Molecular simulation studies of metal organic frameworks focusing on hydrogen purification." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8983.

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The process of purifying hydrogen gas using pressure swing adsorption columns heavily relies on highly efficient adsorbents. Such materials must be able to selectively adsorb a large amount of impurities, and must also be regenerated with ease. The work presented in this thesis focuses on a novel class of porous solids, metal-organic frameworks (MOFs), and their potential for use as adsorbents in hydrogen purification processes. MOFs are tuneable structures, a property that can be exploited in order to achieve the desired characteristics that are beneficial for a specific application. The desi
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47

Farebrother, Adam John. "Formation of diatomic molecules at surfaces." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.272445.

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48

Perry, James Samuel Anthony. "State selective reactions of cosmic dust analogues at cryogenic temperatures." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252206.

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49

Gokcen, Taner. "Molecular engineering of trigonal octupolar materials based on 2,4,6-diarylamino-1,3,5-triazines." Link to electronic thesis, 2005. http://www.wpi.edu/Pubs/ETD/Available/etd-082405-155024/.

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50

Opie, David B. "A superconducting compact hydrogen maser resonator." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539623811.

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The discovery of high critical temperature superconductors (HTSC) has raised the temperature at which the greatly reduced surface resistance, characteristic of superconducting materials, may be exploited. For microwave frequencies below 100 GHz, the surface resistance, R{dollar}\sb{lcub}s{rcub}{dollar}, at liquid nitrogen temperatures (77K) of the new HTSC materials is found to be better than copper measured at the same temperature and frequency. Consequently, the miniaturization of passive microwave components will be among the first applications of these new materials. This dissertation deta
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