Charge Transfer Studies with a Time-of-flight Mass Spectrometer PDF Download
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Author: W. W. Hunt
Publisher:
ISBN:
Category : Ions
Languages : en
Pages : 16
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Book Description
The kinetics of charge transfer processes that occur in the drift tube of a time-of-flight mass spectrometer are analyzed, with due regard to attenuation of both ions and neutrals by scattering. The same equation that expresses the charge transfer cross section in terms of experimentally measurable quantities provides for independent determination, from the same experimental measurements, of the difference between the total scattering cross section for the neutrals and that for the ions involved in the charge transfer process being studied. A second, and much simpler, equation for the charge transfer cross section is used when the scattering cross sections for neutrals and ions are the same. Both equations allow for differences in detector response to neutrals compared with that to ions. (Author).
Author: W. W. Hunt
Publisher:
ISBN:
Category : Ions
Languages : en
Pages : 16
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Book Description
The kinetics of charge transfer processes that occur in the drift tube of a time-of-flight mass spectrometer are analyzed, with due regard to attenuation of both ions and neutrals by scattering. The same equation that expresses the charge transfer cross section in terms of experimentally measurable quantities provides for independent determination, from the same experimental measurements, of the difference between the total scattering cross section for the neutrals and that for the ions involved in the charge transfer process being studied. A second, and much simpler, equation for the charge transfer cross section is used when the scattering cross sections for neutrals and ions are the same. Both equations allow for differences in detector response to neutrals compared with that to ions. (Author).
Author: W. W. Hunt (Jr.)
Publisher:
ISBN:
Category : Charge transfer
Languages : en
Pages : 20
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Book Description
Author: W. W. Hunt
Publisher:
ISBN:
Category : Ions
Languages : en
Pages : 0
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Book Description
The kinetics of charge transfer processes that occur in the drift tube of a time-of-flight mass spectrometer are analyzed, with due regard to attenuation of both ions and neutrals by scattering. The same equation that expresses the charge transfer cross section in terms of experimentally measurable quantities provides for independent determination, from the same experimental measurements, of the difference between the total scattering cross section for the neutrals and that for the ions involved in the charge transfer process being studied. A second, and much simpler, equation for the charge transfer cross section is used when the scattering cross sections for neutrals and ions are the same. Both equations allow for differences in detector response to neutrals compared with that to ions. (Author).
Author: W. W. Hunt
Publisher:
ISBN:
Category : Charge transfer
Languages : en
Pages : 20
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Book Description
The drift tube of a time-of-flight mass spectrometer has been adapted to serve as a reaction/collision chamber for studying ion dissociation reactions and charge-changing collisions. The methods for identifying the products of such processes depend on shifts in flight times produced by symmetric potential barriers, and are normally used in studying processes in which the mass-to-charge ratio (m/q) of the charged product particle is less than that of its parent. Processes in which the m/q of a charged product is greater than that of its parent represent an interesting special case, since the behavior of the product particle is quite different from that normally encountered. To illustrate this behavior, experimental observations of the 2, 1 charge transfer process N2(++) + N2O = N2(+) + N2O(+) at 6000 ev are presented. (Author).
Author: W. W Hunt (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
The kinetics of charge transfer processes that occur in the drift tube of a time-of-flight mass spectrometer are analyzed, with due regard to attenuation of both ions and neutrals by scattering. The same equation that expresses the charge transfer cross section in terms of experimentally measurable quantities provides for independent determination, from the same experimental measurements, of the difference between the total scattering cross section for the neutrals and that for the ions involved in the charge transfer process being studied. A second, and much simpler, equation for the charge transfer cross section is used when the scattering cross sections for neutrals and ions are the same. Both equations allow for differences in detector response to neutrals compared with that to ions. (Author).
Author: W. W. Hunt
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
Author: W. W Hunt (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
A method of using the drift tube of an adapted time-of-flight mass spectrometer as the collision chamber for measuring charge transfer cross sections is described in detail. (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 (Jr.)
Publisher:
ISBN:
Category : Dissociation
Languages : en
Pages : 18
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Book Description
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).
