A Time-of-flight Mass Spectrometer for Studies of Ions Produced by Simulated Micrometeoroid Impact PDF Download
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Author: Robert A. Walter
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 28
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Book Description
Author: Robert A. Walter
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 28
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1730
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Book Description
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : United States
Languages : en
Pages : 1504
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Book Description
Author: Robert J. Cotter
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 360
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Book Description
This book presents the basic principles of time-of-flight (TOF) mass spectrometry with a strong emphasis on applications in biological research. It describes many innovative techniques, including orthogonal extraction, post source decay, and delayed extraction, and surveys ionization techniques used on TOF mass spectrometers such as electron impact, plasma desorption, SIMS, FAB, laser desorption, MALDI, and electrospray. The book features chapters on applications to peptides/proteins, oligonucleotides, and other biological macromolecules, and examines how techniques might be used in sequencing the human genome.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 536
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Book Description
Author:
Publisher:
ISBN:
Category : Mass spectrometry
Languages : en
Pages : 626
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Book Description
Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1464
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Book Description
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
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ISBN:
Category :
Languages : en
Pages :
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Book Description
The present thesis deals with the impact ionization processes appearing at hypervelocity impacts of microparticles on solid surfaces. With a newly developed dust particle source, applied to the Heidelberg Dust Accelerator facility, aluminium, carbon, sodium contaminated carbon, iron and latex projectiles were shot on the micrometeorite detectors CDA and CIDA. The projectile masses cover a range of 10^-18 to 10^-12 kg, the projectile densities a range of 1100 - 7900 kg/m^3 and the impact speeds a range of 2 - 70 km/s. The resulting data show different impact ionization processes depending on the impact speeds: for low speeds (v 6 km/s) dominates surface ionization of target contaminants, for high speeds (v 18 km/s) volume ionization of the target and projectile material is dominating. The charge yield in the intermediate impact speed regime shows a reduced increase due to energy consumption by melting and vaporization processes. Time-of-flight mass spectroscopy, provided by both instruments, enabled the investigation of the chemical composition of the impact plasma depending on the projectile type and on the impact speed. Alkaline ions (Na, K) dominate the mass spectra at low impact speeds. For higher impact speeds appear target ions (Rh), projectile material related ions and hydrogen ions (H). The systematics of characteristic atomic and molecular ion species in the mass spectra helps to get clues on the chemical nature of unknown projectiles in space. An improved model on specific ion yields can be given. Furthermore a lot of results which are important for the instrument calibration and the understanding of flight data, like global charge yields, rise times and sensitivities were obtained. First measurements on the inner instrument wall region are provided.
Author: E.W. Schlag
Publisher: Newnes
ISBN: 0444596186
Category : Science
Languages : en
Pages : 424
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Book Description
The resurgence of time-of-flight mass spectrometry (TOF-MS) has had its origin in the simplicity of construction and application of such instruments together with the high transmission and the great increase in resolution that has been achieved. The instrument lends itself naturally to a coupling with pulsed laser sources, though this is not a prerequisite. It also affords a time resolution far beyond that traditionally achieved with mass spectrometric rapid scan techniques - a recent example being the real-time analysis of a multi-component mixture from an automobile exhaust. Furthermore, the mass range appears to be extremely large: mass up to 500 kDa and beyond what is being readily measured in the laboratory today. The present set of contributions attempts to give a survey of current applications from many of the active groups in the field. A variety of new applications are considered which are no doubt just the beginning of large new areas of application. By presenting this work in book form it is hoped that it will be of help to the many groups intending to initiate work in this rapidly expanding new area of mass spectrometry.
