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Thursday, May 7, 2020 | History

2 edition of Metastable precursor ions. found in the catalog.

Metastable precursor ions.

R. Neeter

Metastable precursor ions.

A table for use in mass spectrometry.

by R. Neeter

  • 382 Want to read
  • 30 Currently reading

Published by Elsevier Scientific Pub. Co. in Amsterdam, New York .
Written in English

    Subjects:
  • Mass spectrometry -- Tables.,
  • Ions -- Spectra -- Tables.

  • Edition Notes

    StatementBy R. Neeter [and] C. W. F. Kort.
    ContributionsKort, C. W. F., joint author.
    Classifications
    LC ClassificationsQC454.M3 N44 1973
    The Physical Object
    Pagination350 p.
    Number of Pages350
    ID Numbers
    Open LibraryOL5458095M
    LC Control Number73160459

    @article{osti_, title = {Metastable isomers: A new class of interstellar molecules}, author = {Green, S and Herbst, E}, abstractNote = {The abundances of a variety of metastable isomers of small organic molecules, analogous to HNC/HCN, in dense interstellar clouds are considered. These metastable species, some of which are thought to exist as intermediates in laboratory organic . Metastable definition, chemically unstable in the absence of certain conditions that would induce stability, but not liable to spontaneous transformation. See more.

    A metastable ion peak is a broad peak which appears at non-integral values of m/e in a mass spectrum. It is formed by a fragment ion. An unstable molecule such as an alcohol can undergo. Metastable peaks for the fragmentation C 2 H 5 N +• → C 2 H 4 N + + H • have been studied in the first field-free region of a double focussing mass spectrometer. Isomeric structures of C 2 H 5 N +• ions derived from a variety of precursor molecules were characterised by their metastable peak shape and kinetic energy release. The identifications were aided by appropriate deuterium Cited by:

    A metastable ion is a precursor ion that dissociates into a fragment ion and neutral species after leaving the ion source (that is, after acceleration) but before reaching the detector. The dissociation is most readily observed when it takes place in one of the field-free regions of a sector mass spectrometer.   This can occur either by auto-dissociation of metastable precursor ions above their dissociation threshold or from collision energy imparted to precursors very near or at their threshold of dissociation during impact with the drift gas. It also suggests that ion mobility could serve as a potential tool for real time reaction by:


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Metastable precursor ions by R. Neeter Download PDF EPUB FB2

THE ORIGIN OF METASTABLE IONS. The term ‘metastable’ has been applied to those ions in a mass spectrometer that have just sufficient energy to fragment some time after leaving the ion source but before arriving at the detector. The excess of internal energy imparted to these ions during ionization is sufficient to give them a rate of decomposition such that the latter occurs during the ion : Robert A.

Johnstone, Malcolm E. Rose. Metastable ions are those that dissociate en route from an ion source, through a mass analyser to an ion detection device. That ions can dissociate in flight was recognized by Hipple and Condon in when they provided the explanation for the presence of the diffuse peaks that they had observed in normal, electron ionization (EI) mass spectra obtained with a single-focusing magnetic sector mass.

THE ORIGIN OF METASTABLE IONS. The term metastable has been applied to those ions in a mass spectrometer that have just sufficient energy to fragment some time after leaving the ion source but before arriving at the detector.

A metastable liquid precursor phase of calcium carbonate and its interactions with polyaspartate Mark A. Bewernitz,a Denis Gebauer,b Joanna Long,c Helmut C€olfen d and Laurie B. Gower*e Invertebrate organisms that use calcium carbonate extensively in the formationFile Size: 1MB.

An ion which is formed with sufficient excitation to dissociate spontaneously during its flight from the ion source to the detector. Source: PAC,63, (Recommendations Metastable precursor ions.

book nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). Metastable ions in a MS double beam mass spectrometer. Analytical Chemistry45 (3), DOI: /aca Robert Boyd. From physical chemistry to mass spectrometry to government lab manager in half a by: 8.

The relationship between metastable ion phenomena and isomerization of gaseous ions is reviewed with particular attention drawn to the effect of rate-determining isomerizations. For a precursor ion scan, the product ion is selected in the second mass analyzer, and the precursor masses are scanned in the first mass analyzer.

Note that precursor ion [4] is synonymous with parent ion [5] and product ion [6] with daughter ion; [7] however the. Le terme «métastable» s’emploie pour caractériser un système qui n'est pas stable en théorie, mais qui paraît tel en raison d'une vitesse de transformation très faible.

Lorsque. Moreover, the metastable ion dissociations of doubly and triply charged C6F6 are identified. The detection of product ions in this manner can diminish interference by the precursor ion. Moreover, it does not need precursor ion separation before product ion analysis. These advantages would expand the capability of mass spectrometry to obtain Author: Tomoyuki Yatsuhashi, Akihiro Kitashoji, Kosei Kitagawa, Akimasa Fujihara.

IUPAC RECOMMENDATIONS Metastable ion ; Ion formed with internal energy higher than the threshold for dissociation but with a lifetime great enough to allow it to exit the ion source and enter the mass analyzer region where it dissociates before detection.: Related Term(s): Reference(s): ical Division.

Compendium of Analytical Nomenclature (the Orange Book). Genre/Form: Tables: Additional Physical Format: Online version: Neeter, R. Metastable precursor ions.

Amsterdam, New York, Elsevier Scientific Pub. Co., Additional Physical Format: Online version: Metastable ions. Amsterdam, New York, Elsevier Scientific Pub.

Co., (OCoLC) Document Type. Invertebrate organisms that use calcium carbonate extensively in the formation of their hard tissues have the ability to deposit biominerals with control over crystal size, shape, orientation, phase, texture, and location. It has been proposed by our group that charged polyelectrolytes, like acidic proteins, Crystallisation – A Biological PerspectiveCited by: Variable-time neutralization−reionization mass spectrometry is used to generate isotopomers of metastable hydrosulfonium radicals, H3S•, of lifetimes ranging between and μs.

The fractions of metastable HS•, HS•, DS•, DS•, and D2H32S• increase with the increasing internal energy of the precursor cations. ^IUPAC gold book definition of tandem mass spectrometer [1] ^ deHoffman, Edmond; Stroobant, Vincent ().Mass Spectrometry: Principles and o: Wiley, ISBN ^ IUPAC gold book definition of metastable ion (in mass spectrometry) [2] ^ IUPAC gold book definition of transient (chemical) species [3] ^ JAMS Vol.

7, Feb.pp [4]. • precursor scan - a product ion is selected and all precursor ions are examined to see which will fragment into the product ion.

This is useful for mixture analysis, e.g. R-A+ →R + A+, where R varies. • neutral loss scan - by linking the two analyzers it is possible to identify all precursor ions losing the same neutral fragment, e.g. CO Size: KB.

Buy Metastable Ions by R G Cooks online at Alibris. We have new and used copies available, in 1 editions - starting at $ Shop now. This is an introductory video about metastable ion, molecular ion and fragment ion. It also states the importance of metastable ions in Mass spec analysis.

For more information, log on to. Metastable ions. Ions produced with lifetimes longer than those of excited ions that decompose in the ion source (prior to about 10 −6 s) are called metastable ions.

The existence of metastable ions can be explained by different mechanisms depending on the size and property of the precursor ion. The shapes and appearance energies of metastable peaks in conjunction with isotopic labelling experiments, show that these novel ions do not interconvert with their conventional isomer at internal energies below the threshold for their fragmentation of lowest energy requirement, namely, loss of H •.Cited by: Homogeneous metastable tetragonal (t ′) solid solutions of ZrO 2 —x mol% CeO 2 (x = 20 and 50) were successfully synthesized by the organic polymerized complex citric acid‐ethylene glycol solution containing Zr and Ce ions was polymerized at about °C and then heat‐treated at about °C to obtain a by: Penning trap mass spectrometry is used to measure the electronic transition energy from a long-lived metastable state to the ground state in highly charged rhenium ions with a precision of 10−