Ion Collection by a Positive Ion Mass Spectrometer PDF Download
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Author: Christopher Sherman
Publisher:
ISBN:
Category : Cations
Languages : en
Pages : 26
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Book Description
Measurements of the voltage-current ion-collection characteristics of a rocket-borne quadrupole mass spectrometer are reported and compared with those previously obtained by means of numerical calculation.
Author: Christopher Sherman
Publisher:
ISBN:
Category : Cations
Languages : en
Pages : 26
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Book Description
Measurements of the voltage-current ion-collection characteristics of a rocket-borne quadrupole mass spectrometer are reported and compared with those previously obtained by means of numerical calculation.
Author: Christopher Sherman
Publisher:
ISBN:
Category : Cations
Languages : en
Pages : 0
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Book Description
Measurements of the voltage-current ion-collection characteristics of a rocket-borne quadrupole mass spectrometer are reported and compared with those previously obtained by means of numerical calculation.
Author: Oliver Adam Schaeffer
Publisher:
ISBN:
Category : Cations
Languages : en
Pages : 16
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Book Description
Author: Takashi Sugimura
Publisher:
ISBN:
Category :
Languages : en
Pages : 63
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Book Description
A systematic parametric variation for the positive ion collection by a rocket-borne probe has been completed for the following parameters; speed ratio 3.10, non-dimensional front face potential -200, zero sidewall potential, Debye numbers from 0.01 to 1000, and Knudsen numbers from 0.007 to 1000. The effects of finite space charge on the vehicle are to lower the ion flux to the stagnation point. It is found that the ion flux follows a uniform trend for Knudsen numbers greater than 0.2, but becomes complicated for the near-continuum regime, e.g., Knudsen number equal to 0.007, which is discussed in detail. Investigation of vehicle angle of attack and internal degrees of freedom indicate that the effects on the ion flux are small. The formulation for the collection negative ions has been completed and preliminary results indicate that the electrons are described properly. (Author).
Author: Fred Stevie
Publisher: Momentum Press
ISBN: 1606505890
Category : Technology & Engineering
Languages : en
Pages : 233
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Book Description
This book was written to explain a technique that requires an understanding of many details in order to properly obtain and interpret the data obtained. It also will serve as a reference for those who need to provide SIMS data. The book has over 200 figures and the references allow one to trace development of SIMS and understand the many details of the technique.
Author: J. C. Vickerman
Publisher: Oxford University Press, USA
ISBN:
Category : Business & Economics
Languages : en
Pages : 368
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Book Description
This book provides an overview of the phenomenology, technology and application of secondary ion mass spectrometry as a technique for materials analysis. This approach is developing into one of the most effective methods of characterizing the composition and chemical state of the surface and sub-surface layers of solid materials. The first three chapters introduce the basic physical and chemical principles involved and the theories which have been proposed to explain the process. Subsequent chapters describe the instrumental components of the SIMS apparatus, the use of SIMS as an analytical tool, and the development of the techniques of sputtered neutral mass spectrometry and laser microprobe and plasma desorption mass spectrometry. Many practical examples are featured to illustrate the application of SIMS to real problems, possible pitfalls are pointed out, and data of use to analysts are collected in appendices. The book is a practical guide suitable for scientists in all fields who wish to use this valuable analytical technique.
Author: Takashi Sugimura
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
The direct simulation Monte Carlo method developed for the prediction of positive ion collection by a rocket-borne probe has to be extended to simulate negative ion collection. It is found that realistic probe potentials can produce a high stagnation-point flux of negative ions while completely rejecting positive ions. However, this flux of negative ions is strongly attenuated by collisions at finite Knudsen numbers. Additionally, the necessary theory has been developed so that direct simulation of nonequilibrium chemistry in the ionosphere can be performed. (Author).
Author: F.W. McLafferty
Publisher: Elsevier
ISBN: 032314277X
Category : Science
Languages : en
Pages : 745
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Book Description
Mass Spectrometry of Organic Ions covers the underlying theories and major applications of mass spectrometry. This 13-chapter book starts with a survey of the mechanisms by which organic ions can decompose and rearrange, as well as the generalized concept in terms of physical-organic chemistry. The discussion then shifts to the advantages and potential of mass spectrometry in structure determination by the elucidation of the empirical formulas of organic ions. Considerable chapters are devoted to the detailed correlations and mechanisms of the mass spectra of long-chain esters, alkylbenzenes, a variety of natural products, aliphatic compounds, and terpenes. The remaining chapters demonstrate the illustrative power of mass spectrometry in structure of petroleum, which is composed of hydrocarbon mixture. This book will be of great benefit to organic and analytical chemists, scientists, and students.
Author: Alan D. Bailey
Publisher:
ISBN:
Category : Emission spectroscopy
Languages : en
Pages : 24
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Book Description
This report presents the positive-ion mass spectrometer that was part of a SWIR rocketborne electron-accelerator experiment. A quadrupole mass filter with a specially designed ion collection configuration is described. Special attention is given to the problem introduced by high positive vehicle potentials which result from the high emission currents of the electron-accelerator. A comprehensive ion mass scanning program is described and important instrument parameters are specified. Typical data is included only to illustrate instrument performance.
Author: Lee W. Parker
Publisher:
ISBN:
Category : D region
Languages : en
Pages : 132
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Book Description
The theory of ion collection at the center of a moving electrically charged blunt-electrode (probe) in the ionospheric D region is considered at high velocities such that the boundary layer is thin. The stagnation-point boundary-layer analysis of Sonin (1967) is reviewed where diffusion, mobility, and convection are coupled within the thin boundary layer at infinity Debye length. A critical parameter is the ion Péclet number P, which is essentially equal to the flow Reynolds number. When the voltage is large compared with (kT/e) square root P, the attracted-ion current is given by the simple linear mobility relation where the current is proportional to the voltage, independent of the flow. Associated with this proportionality is the fact that the attracted-ion concentration is the same at the edge of the boundary layer as it is at infinity. At finite Debye length, the current can depend on the flow and can depend nonlinearly on the voltage. The nonlinearity is associated with a reduction in the attracted-ion concentration at the edge of the boundary layer, due to the presence of space charge. A charge-layer model is used for the space-charge analysis in which the layer (or sheath) is assumed thick compared with the boundary layer but thin compared with the probe radius. Diffusion is neglected, but convection and mobility are included. The nature of the repelled particles must be considered. If the repelled particles are ions, the linear mobility current-voltage relation holds for a restricted range of voltages, independent of the flow. For higher voltages, the relation becomes nonlinear and depends on the flow.
