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
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
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
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 : 20
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
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: W. W. Hunt Publisher: ISBN: Category : Air Force Cambridge Research Laboratories Languages : en Pages : 0
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 Publisher: ISBN: Category : Differential equations Languages : en Pages : 0
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 : Languages : en Pages : 5
Book Description
The drift tube of a time-of flight mass spectrometer can be used as the reaction chamber for kinetic studies of ion dissociation reactions. When the instrument is used in this way, interpretation of the results can be seriously affected by spurious fragment peaks that do not represent products of the ion dissociation reaction being studied. When the fixed delta method of identifying dissociation products is used, spurious fragment peaks originating from normal ions whose unretarded and shifted flight times lie between the unretarded and shifted flight times of the parent ion are particularly troublesome. The ions responsible for such peaks can, however, be identified by means of the flight-time shift equations, which can also be used to predict the retarder voltage Vrf which a particular ion will appear as a spurious fragment peak. (Author).
Author: W. W. Hunt
Author: W. W. Hunt
Author: W. W. Hunt
Author: W. W. Hunt (Jr.)
Author: W. W. Hunt (Jr.)
Author: W. W. Hunt (Jr.)
Author: W. W. Hunt (Jr.)
Author: W. W. Hunt
Author: W. W. Hunt
Author: W. W Hunt (Jr)
Author: W. W. Hunt