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 10 of 10 for “"reflectron time of flight"”.
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BINDING ENERGIES AND SOLVATION OF ORGANIC MOLECULAR IONS, REACTIONS OF TRANSITION METAL IONS WITH, AND PLASMA DISCHARGE IONIZATION OF MOLECULAR CLUSTERS
… have been employed to address the quest of understanding the formation and growth mechanisms of carbon-containing molecular ions with relevance to astrochemistry. Ion mobility mass spectrometry and DFT computations were used to investigate how a second nitrogen in the pyrimidine ring will …
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Development of a quadrupole ion trap / time-of-flight mass spectrometer for mass resolution and ion photophysics
Development of a tandem mass spectrometer, consisting of a quadrupole ion trap (QIT) and a time-of-flight, is described for ion mass resolution and photophysics. Ions are generated externally by electrospray ionization and trapped in the quadrupole ion trap before extraction to the time-of-flight …
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The Study of Positive-Ion Mass Spectrometry of 5-Fluorouracil Using Low-Energy Electron Impact
The aim of the experiment described within this thesis was to generate a molecular beam of 5-fluorouracil and to investigate the fragmentation processes that were induced by low-energy electron impact. The apparatus is contained in a vacuum chamber with three main compartments: the expansion …
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Study of Electron-Impact Induced Fragmentation of Thymine
The aim of the experiment described in this thesis was to generate a molecular beam of thymine and to investigate the fragmentation processes induced by low-energy electron impact. A molecular beam of thymine is generated by placing thymine in powder form inside a resistively heated oven. The beam …
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Low-Energy Electron Impact Fragmentations of the Polycyclic Aromatic Hydrocarbon Anthracene
The aim of the study undertaken for this Masters of Science thesis was to investigate the fragmentation processes induced by low-energy electron impact with anthracene. This research is relevant in the study of low-energy electron interactions with molecules in gaseous environments, including …
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Study of Low Energy Electron-Impact Induced Ionization and Fragmentation of Uracil
The aim of this experiment is to study low energy electron impact induced ionization and fragmentation of uracil. The apparatus consists of a pumped vacuum system with an expansion chamber, a collision chamber and a flight tube. A beam of uracil is generated in the expansion chamber, passes through …
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Development of an Apparatus for the Study of Electron Impact Fragmentation of Molecular Clusters
The aim of the experiment described in this thesis was to generate a beam of molecular clusters and to look at fragmentation processes induced by low-energy electron impact. These processes are studies by time-of-flight detection of ionised and neutral metastable fragments. A beam of molecular …
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Development of analytical methodology based on chromatographic and mass spectrometric techniques for the characterization and fingerprinting of bioactive compounds of Crocus sativus L.
… present research study included the development of analytical methodology based on chromatographic and mass spectrometric techniques for the determination and fingerprinting of bioactive compounds derived from Crocus sativus L. and also their interaction with biomolecules, with the aim to …
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Measurement of soot precursor particles under atmospheric and low pressure conditions by means of time-of-flight mass spectrometry
… progress has been achieved in the understanding of the combustion of hydrocarbons. The gas phase reactions governing the first steps in the combustion process are well understood. The existing models describing the growth of soot particles and the formation of soot aggregates are widely accepted, …
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Laser-Ionization Time-of-Flight Mass Spectrometry of High Molecular Mass Inorganic Complexes
Laser-Ionization Time-of-Flight Mass Spectrometry (LI-TOF-MS) is a sophisticated tool for the molecular-weight determination and structural characterization of a variety of molecules. Advances in instrumentation and ionization methods have recently expanded its role in the analysis of high-mass …