Ion Dissociation in the Drift Tube of a Time-of-flight Mass Spectrometer PDF Download
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Author: W. W. Hunt
Publisher:
ISBN:
Category : Differential equations
Languages : en
Pages : 16
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Book Description
Spurious fragment peaks that simulate fragment-ion products of ion dissociation reactions occurring in the reaction region can arise from processes that occur after the reactant ion has passed through the reaction region and entered the potential barrier used to separate normal products and reactants. Analytic expressions for the flighttime shifts characteristics of peaks arising in this way are derived. These flight-time shifts depend on the distance from the ion source to the potential barrier, whereas flight-time shifts for true fragments formed in the reaction zone are independent of this distance. (Author).
Author: W. W. Hunt
Publisher:
ISBN:
Category : Differential equations
Languages : en
Pages : 16
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Book Description
Spurious fragment peaks that simulate fragment-ion products of ion dissociation reactions occurring in the reaction region can arise from processes that occur after the reactant ion has passed through the reaction region and entered the potential barrier used to separate normal products and reactants. Analytic expressions for the flighttime shifts characteristics of peaks arising in this way are derived. These flight-time shifts depend on the distance from the ion source to the potential barrier, whereas flight-time shifts for true fragments formed in the reaction zone are independent of this distance. (Author).
Author: W. W. Hunt
Publisher:
ISBN:
Category : Air Force Cambridge Research Laboratories
Languages : en
Pages : 12
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Book Description
Applying screened trapezoidal potential barriers in the drift tube of a time-of-flight mass spectrometer produces flighttime shifts that can be used to separate and identify products of ion dissociation processes occurring between the ion source and the potential barrier. The flight-time shift is a function of the retarder voltage and mass-to-charge ratios of the fragment and parent ions, expressed by the flight-time shift equation. When the retarder voltage is known, analytic solu tions of this equation allow the retarded ions (fragment or parent) to be identified from the measured flight-time shifts. When the mass-to-charge ratios of these ions are known, similar solutions allow the retarder voltage that will produce a given flight-time shift to be predicted. For part IV see AD-429 438. (Author).
Author: W. W. Hunt (Jr.)
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 16
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Book Description
Author: W. W. Hunt (Jr.)
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 18
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Book Description
Author: W. W. Hunt (Jr.)
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 20
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Book Description
The fixed [delta]t method of identifying fragment ions formed in the drift tube (analyzer) of a time-of-flight mass spectrometer depends on determining the potential barrier characteristics required to produce a preselected flight-time shift. It is both simpler and more accurate than the comparison method used in a previous series of experiments.
Author: W. W. Hunt (Jr.)
Publisher:
ISBN:
Category : Ions
Languages : en
Pages : 24
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Book Description
The shifts in ion flight times produced by a flat-top potential barrier applied within the drift tube of a time-of-flight mass spectrometer are defined analytically in terms of the height of the potential barrier. These flight-time shifts are selectively dependent on the mass, charge, and kinetic energy of the ions involved; consequently, they can be used to spearate and identify the products of ion dissociation processes occurring in the drift tube. Comparisons of calculated and observed flight-time shifts for the 58 + to 43+, 42+ dissociations in n-butane are used to illustrate the applicability and present limitations of this method of identifying dissociation products. (Author).
Author: R. A. Mapleton
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 22
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Book Description
The first Born approximation with both the proton-proton and proton-electron interaction is used to calculate the high energy electron capture cross section. It is shown that the high energy proton-nucleus amplitude has a dominant peak for backward scattering (centre-of-mass system). As a consequence of this peak, if the protons are treated as distinguishable particles, the cross section depends upon the impact energy E as E(3- ) in contrast to the commonly accepted E(6- ) dependence. When the protons are treated as indistinguishable particles, the electron capture cross section is not defined at sufficiently high energies. This same cross section is also calculated using the distorted wave approximation as developed by Bassel and Gerjuoy in 1960. It is shown that the proton-nucleus amplitude is only cancelled in the forward direction, and consequently the electron capture cross section is again not defined at high energies. (Author).
Author: Paul H. Carr
Publisher:
ISBN:
Category : Acoustics
Languages : en
Pages : 12
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Author: N. F. Yannoni
Publisher:
ISBN:
Category : Chemical bonds
Languages : en
Pages : 4
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Book Description
An X-ray analysis of the molecular and crystal structure of 2-(4'-amino-5'-azamethenyl pyrimidyl)-3 pentene-4-ol was recently completed. Significant results of this work include the determination of the structural parameters of the pyrimidine ring with an accuracy hitherto unavailable in the chemical literature, and the elucidation of a comprehensive system of hydrogen bonds which, in large part, are responsible for the molecular packing as it exists in the crystal. Each molecule participates in a total of six hydrogen bonds. Two amino hydrogen atoms and one hydroxyl hydrogen atom participate in hydrogen bonds to other molecules and three nitrogen atoms (two in the ring and one in the long side-chain) participate in hydrogen bonds which have the hydrogen atom chemically bound to adjacent molecules. (Author).
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 252
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Book Description
