Mass spectrometry metastable ions

See also Biochemical Applications of Mass Spectrometry Fast Atom Bombardment Ionization in Mass Spectrometry Fragmentation in Mass Spectrometry Metastable Ions Quadrupoles, Use of in Mass Spectrometry Sector Mass Spectrometers Time of Flight Mass Spectrometers. 

See also Fragmentation in Mass Spectrometry Ion Energetics in Mass Spectrometry Ion Molecule Reactions in Mass Spectrometry Metastable Ions Neutralization-Reionization in Mass Spectrometry Photoelectron-Photoion Coincidence Methods in Mass Spectrometry (PEPICO) Photoionization and Photodissociation Methods in Mass Spectrometry Proton Affinities. 

See also Field Ionization Kinetics in Mass Spectrometry Fragmentation in Mass Spectrometry Ion Dissociation Kinetics, Mass Spectrometry Ion Structures in Mass Spectrometry Ionization Theory Isotopic Labelling in Mass Spectrometry Metastable Ions MS-MS and MS" Sector Mass Spectrometers Statistical Theory of Mass Spectra Stereochemistry Studied Using Mass Spectrometry. 

See also Chemical Ionization In Mass Spectrometry Fragmentation In Mass Spectrometry Metastable Ions Photoelectron Spectroscopy Photolonizatlon and Photodlssoclatlon Methods In Mass Spectrometry. 

Organophosphorus Chemistry series regularly lists new mass spectra in the Physical Methods chapter . With this in mind, an approach which considers fundamental aspects of organophosphorus ions (i.e. structure and reactivity) in the gas phase has been adopted. The gas-phase structure and reactivity of ions can be probed via several different techniques, including thermochemical measurements, kinetic energy release of metastable ions, collisional activation mass spectrometry, neutralization reionization mass spectrometry and ion-molecule reactions. An example is the molecule HCP (Table 1) its ionization potentiaP, proton affinity and the IR and rotational spectroscopy of the HCP ion " have all been determined in the gas phase. Another important tool for understanding the structure and reactivity of gas phase ions is ab initio molecular orbital theory. With advances in computational hardware and software, it is now possible to carry out high-level ab initio calculations on smaller systems. Indeed, the interplay between experiment and theory has fuelled many studies ... 

INS Ion neutralization spectroscopy MQS Metastable quenching spectroscopy SSIMS Static secondary-ion mass spectrometry ISS Ion scattering spectroscopy... 

See also Ion Trap Mass Spectrometers Metastable Ions Peptides and Proteins Studied Using Mass Spectrometry Sector Mass Spectrometers Surface Induced Dissociation In Mass Spectrometry Time of Flight Mass Spectrometers. 

Figure 5 Losses of CH3 and CD3 expressed in percentages of their sum, as a function of the lifetime of the molecular ion of pent-3-en-2-ol-1,1,1-0. CH3CH=CHCH(OH)CD3. Reprinted from the International Journal of Mass Spectrometry and Ion Physics 38 Zwinselman JJ, Nibbering NMM, Middlemiss NE, Vajda JH and Harrison AG, Afield ionization kinetics and metastable ion study of the fragmentation of some pentenols, 163-179, Copyright 1981, with permission from Elsevier Science.

Metastable ions yield valuable information on fragmentation in mass spectrometry, providing insight into molecular structure. In electron ionization, metastable ions appear naturally along with the much more abundant normal ions. Abundances of metastable ions can be enhanced by collisionally induced decomposition. 

Linked Scanning and Metastable Ions in Quadrupole Mass Spectrometry... 

In mass spectrometry, the required connectivities (links) can be obtained from observations on metastable ions. For example, finding a metastable ion for a supposed process, M+ F3+, proves the process exists. 

Tandem mass spectrometry summarizes the numerous techniques where mass-selected ions (MSI) are subjected to a second mass spectrometric analysis (MS2). [111,112] Dissociations in transit through the mass analyzer may either occur spontaneously metastable. Chaps. 2.7.1, 2.8.2) or can result from intentionally supplied additional activation, i.e., typically from collisions with neutrals. Below, we will chiefly discuss the collision process as such and its consequences for the further fate of the ions. Instrumental aspects of tandem MS are included in Chap. 4 and applications are presented in Chaps. 7-12. 

Methods for the detection of metastable ion dissociations in ReTOF-MS in combination with secondary ion mass spectrometry (SIMS) and Cf plasma desorption ( Cf-PD, Chap. 9.5.2) mass spectrometry were known before the advent of MALDI. [56-59]... 

Isotope Abundances Negative Ions Synthetic Models V. High-Resolution Studies VI. Metastable-Ion Techniques VII. Coupled Gas Chromatography and Mass Spectrometry Inorganic and Organometallic Compounds VIII. Conclusion. ... 

Mass spectrometry is suitable for the identification of pyrrolo-benzodiaze-pines and the differentiation of their isomers (1996M1653). A structural distinction can be made easily from their mass spectra or the metastable mass-analyzed ion kinetic energy (MIKE) spectra, produced by their molecular or most intense fragment ions. Established fragmentation pathways have been supported by MNDO and AMI semiempiiical calculations. 

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