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Articles 1 - 3 of 3
Full-Text Articles in Chemistry
Development Of Ultrasonic-Based Ambient Desorption Ionization Mass Spectrometry, Linxia Song
Development Of Ultrasonic-Based Ambient Desorption Ionization Mass Spectrometry, Linxia Song
USF Tampa Graduate Theses and Dissertations
Ambient desorption/ionization techniques (ADI) have drawn significant attention in mass spectrometric instrumentation development. The analyte classes that are successfully studied by any ADI mass spectrometry (MS) method strongly depends on how gas-phase ions are generated. Spray-based techniques may ionize molecules across a wide range of mass-to-charge ratios, but are commonly used for polar analyte, however, suffers from severe matrix effect. Contrastingly, methods employing electric (or laser) plasmas are capable of ionization of polar and nonpolar analytes suffering from less matrix effect, but primarily targeting those with low molecular masses. Thus far, developments of universal ionization methods, which do not depend …
Optimization Of A Digital Ion Trap To Perform Isotope Ratio Analysis Of Xenon For Planetary Studies, Timothy Vazquez
Optimization Of A Digital Ion Trap To Perform Isotope Ratio Analysis Of Xenon For Planetary Studies, Timothy Vazquez
USF Tampa Graduate Theses and Dissertations
Ion trap mass spectrometers present a powerful analytical tool which not only enables mass spectrometric determination of analyte species but also has the added feature of being able to act as an ion storage device. As a mass spectrometer, ion traps can achieve a reasonable mass range with flexible mass resolution while boasting a considerably smaller footprint when compared to conventional time-of-flight or magnetic sector instruments. Due to their smaller geometries, high-pressure tolerance, and ability to perform tandem mass spectrometry, ion trap mass spectrometers are ideal candidates for portable applications such as deployment to another planetary body. While ideal candidates …
Differential Mobility Spectrometry-Mass Spectrometry (Dms-Ms) For Forensic And Nuclear-Forensic Applications, Ifeoluwa Ayodeji
Differential Mobility Spectrometry-Mass Spectrometry (Dms-Ms) For Forensic And Nuclear-Forensic Applications, Ifeoluwa Ayodeji
USF Tampa Graduate Theses and Dissertations
In forensics and nuclear-forensics, the current lab-based analytical technique employed can be laborious, time consuming, and less suitable for in-situ and real time screening. However, it is important to develop fast and fieldable instrumental technique, without a tradeoff for its high throughput, for drug screening and radionuclear analysis. The underlying factors to be considered in the instrument development ranges from: high potency of samples, even at very low concentration; complex nature of samples in the surrounding environment; real-time chemical composition variation; and instrument size, weight and power (SWAP) consideration. Differential mobility spectrometry (DMS), also known as field asymmetric waveform ion …