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 7 of 7 for “"Ionization sources."”.
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A study of optical properties and current emission processes of gas phase field ionization sources
Field emission ion sources are extremely important for producing high-resolution ion beams essential for several fields of research and especially for semiconductor manufacturing. Although most sources used are based on liquid metals they cannot produce beams of H, He or other noble gases, so that …
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Development Of A Field-Portable Miniature Mass Spectrometer Designed For In-Situ Analysis And Ion Trap Miniaturization
… vacuum systems, mass analyzers, electronics, and ionization sources have allowed for the development of field-portable mass spectrometers. The performance of portable instruments has received much attention for their utility in the detection of illicit drugs, explosives, environmental …
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Experimental and theoretical investigations of molecular ions by spectroscopy as well as ion mobility and mass spectrometry
… 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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Improved mass spectrometry characterization of organic compounds using analyte preconcentration and radio-frequency ionization.
… of efficient sampling techniques and versatile ionization sources. Presented research projects focus on the use of analyte preconcentration and radio-frequency ionization to improve sensitive characterization of organic compounds with MS. A home-built post-column cryogenic trap (PCCT) coupled to …
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Native surface mass spectrometry via static liquid extraction and laser ablation sampling for structural characterization of macromolecules in gas phase.
… In this dissertation, an online extraction-ionization platform, using either a solid-liquid microextraction or laser ablation microextraction sampling, was coupled to a commercial mass spectrometer equipped with traveling wave-ion mobility for in depth characterization of proteins' …
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Mass spectrometry methods for imaging cellular lipids, organelles, and proteins
… addition to imparting charge upon analytes, ion sources have been designed with imaging modalities for visualizing the spatial distributions of ions with specific m/z in samples, including cells and tissues. The ion source utilized determines whether a distinctive label must be incorporated into …
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Development of enabling technologies for single cell analysis with mass spectrometry
… cells efficiently. A variety of microprobe ionization sources are suitable for such analyses, though smaller probe footprints can utilize more densely seeded samples. This dissertation describes two technologies for performing single cell analysis with mass spectrometry. The first, …