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 9 of 9 for “"Quadrupole Ion Trap"”.
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Development of a Laminar Construction Quadrupole Ion Trap
The three-dimensional quadrupole ion trap (QIT) is an extraordinary device. It functions both as an ion store in which gaseous ions can be confined for a period of time and as a mass spectrometer of considerable mass range and variable mass resolution. Over the past few decades, it has evolved into …
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Development of a quadrupole ion trap / time-of-flight mass spectrometer for mass resolution and ion photophysics
… 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 section …
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Reducing interferences in glow discharge spectroscopies using transient operation and collision -induced dissociation
… room for improvement. The accuracy and precision of quantitative analyses by mass spectrometry and optical emission spectroscopy are often dependent on the presence of interferences. Interferences are defined as a measured signal response to a species at the spectral position of interest for …
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Mass spectrometric investigation of the OH induced oxidation of isoprene using 0 2 + as a chemical ionization reagent
… compound emitted into the atmosphere by vegetation, with an annual global emission rate of 500 Tg/yr. It represents almost 50% of all biogenic non-methane hydrocarbons on a global scale. It has a substantial impact on troposphere oxidants. The focus of this research is a preliminary …
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Anion-induced zwitterion formation in gas-phase arginine
… biological molecules provide important information not available in solution. In particular, all naturally occurring amino acids are known to be zwitterionic in solution, whereas most adopt canonical structures in the gas-phase. However, complexation with solvent molecules and cations can induce …
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Mass Spectral Studies to Investigate Butylbenzene Fragmentation Pathway and Pyrolysis Products.
In this dissertation research, two fundamental studies involving gas chromatography mass spectrometry of n-butylbenzene and pyrolysis products are presented. In the first study, fragmentation pathways of n-butylbenzene in quadrupole ion trap have been investigated. At low energy, product ion …
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Instrumentation and development of a mass spectrometry system for the study of gas-phase biomolecular ion reactions
<p>Gas-phase reactions of biomolecular ions are highly relevant to the understanding of structures and functions of the biomolecules. Mass spectrometry is a powerful tool in investigating gas-phase ion chemistry. Various mass spectrometers have been developed to explore ion/molecule reactions, …
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Experimental and theoretical investigations of molecular ions by spectroscopy as well as ion mobility and mass spectrometry
The aim of this thesis was the elucidation of different ionization methods (resonance-enhanced multiphoton ionization – REMPI, electrospray ionization – ESI, atmospheric pressure chemical ionization – APCI) in ion mobility (IM) spectrometry. In order to gain a better understanding of the ionization …
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The Characterization of Glycosaminoglycans and Metallic Dianions in the Gas Phase
… and intrinsic stabilities. Low energy Collision Induced Dissociation (CID) in a quadrupole ion trap was used to investigate the relative stabilities of the systems along with high energy (50-150 keV) Mass Induced Kinetic Energy (MIKE) experiments. The related alkali metal cation complexes …