Development of a Miniaturized Hadamard Transform Time-of-Flight Mass Spectrometer PDF Download
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Languages : en
Pages : 27
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This report details advances in theory and technology for the precise deflection of high kinetic energy ion beams using Bradbury-Nielsen gates (BNGs) and their application to high duty cycle miniaturized mass spectrometry. We have developed methods to fabricate BNGs using template assisted manual weaving and silicon-on-insulator microfabrication. These devices have been characterized using ion beam imaging techniques, and the results compared to mathematical models of the deflection process developed for this purpose. A new vacuum-compatible electronic system has been constructed to allow the deflection of ions using BNGs following an arbitrary digital sequence that minimizes the impact of impedance mismatching within the circuit and improves the precision of deflection. The aforementioned advances have been integrated to develop a new form of time-of-flight mass spectrometry that allows for 100% duty cycle detection of a continuous ion beam. Experiments detailing 100% duty cycle operation are described. The statistical advantages to this form of detection over other forms of mass spectrometry in a shot noise dominant environment are presented.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
This report details advances in theory and technology for the precise deflection of high kinetic energy ion beams using Bradbury-Nielsen gates (BNGs) and their application to high duty cycle miniaturized mass spectrometry. We have developed methods to fabricate BNGs using template assisted manual weaving and silicon-on-insulator microfabrication. These devices have been characterized using ion beam imaging techniques, and the results compared to mathematical models of the deflection process developed for this purpose. A new vacuum-compatible electronic system has been constructed to allow the deflection of ions using BNGs following an arbitrary digital sequence that minimizes the impact of impedance mismatching within the circuit and improves the precision of deflection. The aforementioned advances have been integrated to develop a new form of time-of-flight mass spectrometry that allows for 100% duty cycle detection of a continuous ion beam. Experiments detailing 100% duty cycle operation are described. The statistical advantages to this form of detection over other forms of mass spectrometry in a shot noise dominant environment are presented.
Author: Néstor Rodriguez
Publisher:
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Category :
Languages : en
Pages : 260
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Author:
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Category :
Languages : en
Pages : 15
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This program applied the Hadamard transform method to atmospheric pressure ion mobility separation (IMS) for the analysis of trace species. Target applications include chemical and biological agent detection as well as protein sequencing and identification. We demonstrate that the Hadamard transform approach improves sensitivity by increasing sample throughput, yet requires only minimal modification to the existing hardware. In Phase I we programmed commercially available DSP electronics that operated an existing IMS for Hadamard transform modulation and collected ion signal synchronous with yet at higher rates than the Hadamard modulation sequence. This strategy allows for parsing of the analog signal to avoid noise associated with the pulsing of the Bradbury Nielson ion gate and also allowed for easy comparison of various modulation rates and sequence lengths.
Author: Wolfgang Demtröder
Publisher: Springer
ISBN: 3662555239
Category : Science
Languages : en
Pages : 561
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Book Description
This introduction to Atomic and Molecular Physics explains how our present model of atoms and molecules has been developed over the last two centuries both by many experimental discoveries and, from the theoretical side, by the introduction of quantum physics to the adequate description of micro-particles. It illustrates the wave model of particles by many examples and shows the limits of classical description. The interaction of electromagnetic radiation with atoms and molecules and its potential for spectroscopy is outlined in more detail and in particular lasers as modern spectroscopic tools are discussed more thoroughly. Many examples and problems with solutions are offered to encourage readers to actively engage in applying and adapting the fundamental physics presented in this textbook to specific situations. Completely revised third edition with new sections covering all actual developments, like photonics, ultrashort lasers, ultraprecise frequency combs, free electron lasers, cooling and trapping of atoms, quantum optics and quantum information.
Author: Ignacio Zuleta
Publisher:
ISBN:
Category :
Languages : en
Pages : 136
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Author: Andrew Charles Chrest
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Category : Ions
Languages : en
Pages : 86
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Author: Michelle Lynn Pyle
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Category :
Languages : en
Pages :
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Variations of gas and plasma density and composition in Earth0́9s thermosphere and ionosphere are key indicators of interactions between diƠ̐0erent layers of Earth0́9s atmosphere. The nature of interactions between neutral and ion species in the upper atmosphere is an active area of study in Heliophysics and there is much to learn about the dynamic relationship between the ionosphere and neutral thermosphere. Mass Spectrometers are among an array of instruments used to explore Earth0́9s upper atmosphere and other space environments. In the past, data from mass spectrometers Ơ̐2own in low earth orbit has been used to improve atmospheric models and to study the dynamics of the ionosphere and thermosphere. Historically, these instruments are substantial in size and deployed on larger satellite platforms. Data from these larger instruments generally provide information from a speciƠ̐1c point in time at a single location. Studies of atmospheric density and composition with multiple locations for each time point could be performed by CubeSat swarms if proper instrumentation were available to Ơ̐1t CubeSat payload restrictions. The proposed miniaturized time-of-Ơ̐2ight (TOF) mass spectrometer (M.S.) will have a mass resolution and range suƠ̐3cient for measuring the composition of Earth0́9s thermosphere and ionosphere while operating within the power and space constraints of a CubeSat. The capabilities of this instrument could dramatically reduce the cost of future missions while simultaneously enhancing the science return. The design employs miniaturization of TOF-MS technology, including resolution reƠ̐1nement techniques used for larger instruments and standard concepts for TOF-MS components such as acceleration grids, a Bradbury-Nielsen wire gate, a gridless ion mirror, and microchannel plate detector.
Author: Christopher Matthew Williams
Publisher:
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Category : Atmospheric ionization
Languages : en
Pages :
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Author: M. L. M. Quiniou
Publisher:
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Category :
Languages : en
Pages :
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Author: Michel Louis Marie Quiniou
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Category :
Languages : en
Pages :
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