scholarly journals Dynamics of Fragmentation Reactions From Peak Shapes in Multiparticle Coincidence Experiments

1991 ◽  
Vol 11 (3-4) ◽  
pp. 259-263 ◽  
Author(s):  
J. H. D. Eland
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Charge Separation ◽  
Mass Spectra ◽  
Doubly Charged Ions ◽  
Fragmentation Reactions ◽  
Doubly Charged ◽  
Charged Ions ◽  
Two Parameter ◽  
Experimental Survey

An experimental survey of peak shapes in two-parameter mass spectra from charge separation of doubly charged ions has been combined with Monte-Carlo simulations of peak shapes for different mechanisms. As a result, the major mechanisms, deferred charged separation, secondary dissociation and concerted explosion, can now be recognised. Finer details and a number of recurrent peculiar peak shapes remain unexplained.

Differentiation of Ionised Benzimidazole from its Isomeric α-Distonic Ion by Collision-Induced Dissociation and Neutralisation—Reionisation Mass Spectrometry

2005 ◽  
Vol 11 (4) ◽  
pp. 381-387 ◽  
Author(s):  
Thanasis Karapanayiotis ◽  
Richard D. Bowen
Keyword(s):  
Mass Spectra ◽  
Radical Cations ◽  
Time Frame ◽  
Careful Consideration ◽  
Collision Induced Dissociation ◽  
Doubly Charged Ions ◽  
Doubly Charged ◽  
Ion Collision ◽  
Charged Ions ◽  
Distonic Ion

Ionised benzimidazole and its isomeric α-distonic ion (or ionised ylid) have been examined by recording their metastable ion, collision-induced dissociation and neutralisation–reionisation mass spectra. These tautomers may be distinguished by careful consideration of key features of the collision-induced dissociation spectra, with or without prior neutralisation and reionisation. Formation of doubly-charged ions by charge stripping occurs preferentially when the α-distonic ion is subjected to collision. This α-distonic ion survives neutralisation and reionisation, thus establishing that the corresponding ylid is stable on the microsecond time frame. The effects of benzannulation on the ease of differentiation of classical and distonic radical cations derived from biologically important heterocycles are considered.

Abundant doubly-charged ions in the mass spectra of substituted diphenylmethanes

1968 ◽  
Vol 1 (4-5) ◽  
pp. 415-418 ◽  
Author(s):  
J.D. Fitzpatrick ◽  
Ward M. Scott ◽  
C. Steelink ◽  
Morton E. Wacks
Keyword(s):  
Mass Spectra ◽  
Doubly Charged Ions ◽  
Doubly Charged ◽  
Charged Ions

Fragmentation reactions of doubly charged ions of nitrogenous heterocyclic aromatic compounds

1991 ◽  
Vol 95 (13) ◽  
pp. 4989-4998 ◽  
Author(s):  
H. Perreault ◽  
L. Ramaley ◽  
F. M. Benoit ◽  
P. G. Sim ◽  
R. K. Boyd
Keyword(s):  
Aromatic Compounds ◽  
Doubly Charged Ions ◽  
Fragmentation Reactions ◽  
Doubly Charged ◽  
Charged Ions

ChemInform Abstract: Fragmentation Reactions of Doubly Charged Ions of Nitrogenous Heterocyclic Aromatic Compounds.

ChemInform ◽  
2010 ◽  
Vol 22 (37) ◽  
pp. no-no
Author(s):  
H. PERREAULT ◽  
L. RAMALEY ◽  
F. M. BENOIT ◽  
P. G. SIM ◽  
R. K. BOYD
Keyword(s):  
Aromatic Compounds ◽  
Doubly Charged Ions ◽  
Fragmentation Reactions ◽  
Doubly Charged ◽  
Charged Ions

Mass spectra of doubly charged ions

1989 ◽  
Vol 24 (7) ◽  
pp. 504-510 ◽  
Author(s):  
Michael Barber ◽  
David J. Bell ◽  
Michael Morris ◽  
Lee W. Tetler ◽  
Michael D. Woods ◽  
...  
Keyword(s):  
Mass Spectra ◽  
Doubly Charged Ions ◽  
Doubly Charged ◽  
Charged Ions

Massenspektroskopische Festkörperuntersuchungen verbesserter Reproduzierbarkeit mit dem Gleichstrom-Abreißfunken im Vakuum zur lonenerzeugung

1963 ◽  
Vol 18 (8-9) ◽  
pp. 926-941 ◽  
Author(s):  
K. D. Schuy ◽  
H. Hintenberger
Keyword(s):  
Mass Spectra ◽  
Multiply Charged Ions ◽  
Doubly Charged Ions ◽  
Multiply Charged ◽  
Singly Charged ◽  
Main Component ◽  
Doubly Charged ◽  
Charged Ions ◽  
Spectrum Evaluation ◽  
Speed Of Analysis

Mass spectra obtained with the disjunctive d.c.-spark in vacuum show considerable improvement in accuracy and reproducibility over the conventional r.f.-spark of the DEMPSTER type. Higher ion currents increase the speed of analysis. A number of mass spectra were produced with a spectroscopic steel standard. The methods of visual and photometric spectrum evaluation are discussed in detail, using two quantities defined as “element sensitivity” and “normalized ionization sensitivity”. The former is a measure of how much more sensitive a given element can be photographically detected with the mass spectrograph than the main component of the sample (matrix element), while the latter indicates how much more sensitive multiply-charged ions of an element can be detected on the plate than singly-charged ions of the same element. Both element- and ionization sensitivities are reproducible to within approximately 20%. Furthermore, it is found, for most elements investigated, that the lines due to doubly-charged ions are more intense than those due to singly-charged ions and that the differences of element sensitivities of various elements decrease for ions of higher charge. The reproducibility of multiply-charged ions permits their use in the quantitative analysis of the sample.

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