Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 258 for “"Ionisation"”.
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Ionisation in Flames with Additives
… were made of the effects of phosphorus on the ionisation of sodium, potassium, rubidium and caesium. The ionisation of lithium is reduced by extensive hydroxide formation, and was too small for accurate measurements. The construction of the measuring system is described, together with a …
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Ionisation studies of chlorinated and fluorinated compounds
Ionisation processes in gas-phase polyatomic molecules have been studied using threshold photoelectron photoion coincidence and selected ion flow tube techniques for cations and an electron attachment mass spectrometer for anions. Cation formation has been studied for fluoroform (CHF\(_3\)), …
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Mechanismen der Ionisation atomarer Systeme in intensiven Laserpulsen
… unter einem neuen Aspekt zu betrachten. Der Ionisationsprozess des Wasserstoffmolekuelions im starken Lichtfeld wird eingehend untersucht, insbesondere die Frage, bei welchen Kernabstaenden die Ionisation stattfindet. Fuer das Heliumatom liefert die Analyse der zur Einfach- bzw. …
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Ultrafast Ionisation Dynamics Induced by Short Proton Pulses
This work presents experimental results obtained using the TARANIS laser at Queen’s University Belfast of transient absorption spectroscopy of dynamics induced by bursts of radiation, predominantly ions, from high-power laser-solid interactions. The absolute measurement of proton bursts as short as …
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Photo(doppel)ionisation von Helium und einfachen Molekülen
Die vorliegende Arbeit beschäftigt sich mit dem Übergang<br>weniger geladener Teilchen von einem gebundenen Anfangszustand <br>in einen vollständig fragmentierten <br>Kontinuumszustand durch die Absorption eines <br>einzelnen Photons. <br>Dabei wird die analytische Form des Übergangsmatrixelements …
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Kinematisch vollständige Experimente zur Ionisation im Elektronenstoß und Laserfeld
… der vorliegenden Arbeit wurde die Elektronenstoßionisation von Helium mit schnellen Elektronen untersucht und kinematisch vollständig vermessen. Durch Verwendung eines sogenannten Reaktionsmikroskops konnten die Impulse aller Stoßfragmente über den vollen Raumwinkel und große Energiebereiche …
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Fundamental aspects of imaging matrix assisted laser desorption ionisation mass spectrometry.
Matrix assisted laser desorption/ionisation mass spectrometry imaging is a recent addition to the existing family of molecular imaging technologies. It has the capacity to map the distribution of molecules within a biological tissue section, without the need for radionuclide or fluorescent …
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An investigation of beryllium coordination chemistry using electrospray ionisation mass spectrometry
The electrospray ionisation mass spectrometric behaviour of various complexes of beryllium have been investigated in this thesis. These beryllium complexes were prepared in situ on a small scale by preparing appropriate molar mixtures of the Be²⁺ ion with ligands in a range of solvent systems. In …
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Theoretical study of direct and indirect single ionisation by electron impact /
The dissertation analyses the processes of single ionisation with electron impact using the distorted wave approximation. The work focuses on W5+, W25+, W26+, Fe3+ and Se3+ ions. The atomic data of these ions are important and have practical application perspectives for understanding and …
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Thin layer chromatography-matrix assisted laser desorption ionisation-mass spectrometry of pharmaceutical compounds.
… TLC plates by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (MALDI TOF MS). The study was started by comparing several approaches for the application of the matrix for direct TLC-MALDI including a newly developed electrospray matrix deposition method. This new …
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Mathematical modelling of unsteady tube stretching with internal channel pressurisation for fabricating electrospray ionisation emitters
Nanoelectrospray ionisation (nESI) is a useful technology for assessing the chemical composition of various liquid samples using mass spectrometry (MS). Signi cant e orts have been made in the design of nESI emitters, as their shape and geometry are critical to the electrospray performance and …
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^Das^ Fulleren C 60 als molekulare Sonde für Untersuchungen zum Elektronentransfer beim massenspekrometrischen Verfahren der Desorption/Ionisation
… bei der Anwendung der Desorption/Ionisation in der Massenspektrometrie von Biomolekülen zu erhalten. Dazu sind massenspektrometrische und optisch-spektroskopische Untersuchungen von Proben durchgeführt worden, denen vor allem beta-Carotin oder z.B. Chlorophyll-a im Sinne einer …
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Simulation numérique des processus d'excitation et d'ionisation de l'ion moléculaire d'hydrogène en champ laser intense
… étudions dans un premier temps le processus d'ionisation au-dessus du seuil dans H+2 à différentes intensités lasers. Dans un second temps, nous étudions les processus d'ionisation et d'excitation de l'ion H+2 soumis à une impulsion laser à dérive de fréquence. Nous montrons plus …
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The detection and characterisation of novel alkyl spin-adducts of PBN and its derivatives using capillary gas chromatography coupled to electron-ionisation mass spectrometry
Free radical induced oxidative stress has been reported to be involved in several diseases such as diabetes mellitus, neurodegenerative disorders, cardiovascular diseases (atherosclerosis and hypertension), respiratory diseases (asthma), cataract development, rheumatoid arthritis and in various …
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Étude théorique de la double excitation et ionisation des ions héliumoïdes et bérylliumoïdes avec des impulsions lasers dans l'ultravolet extrême et rayons x
… théorique sur les processus d’excitation et d’ionisation des systèmes héliumoïdes et bérylliumoïdes déclenchés par des impulsions lasers intenses dans le domaine spectral des ultraviolets extrêmes et des rayons X. Nous décrivons dans un premier temps une méthode numérique permettant de calculer …
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Tiesioginės ir netiesioginės viengubos jonizacijos elektronų smūgiais tyrimas /
The dissertation analyses the processes of single ionisation with electron impact using the distorted wave approximation. The work focuses on W5+, W25+, W26+, Fe3+ and Se3+ ions. The atomic data of these ions are important and have practical application perspectives for understanding and …
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