Photodissociation at 193 nm of some singly protonated peptides and proteins withm/z 2000–9000 using a tandem time-of-flight mass spectrometer equipped with a second source for delayed extraction/post-acceleration of product ions

2007 ◽  
Vol 21 (3) ◽  
pp. 359-368 ◽  
Author(s):  
Jeong Hee Moon ◽  
Young Sik Shin ◽  
Hyun Jung Cha ◽  
Myung Soo Kim
Keyword(s):  
Mass Spectrometer ◽  
Time Of Flight ◽  
Protonated Peptides ◽  
Flight Mass Spectrometer ◽  
Product Ions ◽  
Delayed Extraction ◽  
193 Nm

Ion–molecule reactions in the binary mixture of acetaldehyde and trioxane. II. Mechanism for the reaction of acetaldehyde molecular ion with trioxane

1978 ◽  
Vol 56 (4) ◽  
pp. 533-537 ◽  
Author(s):  
Minoru Kumakura ◽  
Kazuo Arakawa ◽  
Toshio Sugiura
Keyword(s):  
Binary Mixture ◽  
Mass Spectrometer ◽  
Rate Constants ◽  
Positive Charge ◽  
Time Of Flight ◽  
Intermediate Complex ◽  
Hydrogen Atoms ◽  
Flight Mass Spectrometer ◽  
Ion Molecule Reactions ◽  
Product Ions

The ionic reaction of CH3CHO+with trioxane in acetaldehyde–trioxane mixtures has been studied using a time-of-flight mass spectrometer. The product ions, C3H5O2+, C3H6O2+, and C3H7O2+, were formed by condensation–elimination reactions, which involve the elimination of aformaldehyde molecule. The dissociation of the intermediate-complex, CH3CHO(CH2O)3+*, leads to the formation of the product ions. The structure of the complex is linear with localized positive charge. Rearrangement of hydrogen atoms occurs in the complex but not extensive scrambling. From the distribution of the isotopic product ions in acetaldehyde-d4–trioxane mixtures it was proposed that the origins of the product ions are the acetaldehyde molecule (reactant ion) and fragments from trioxane. The rate constants for the product ions formed in acetaldehyde (or acetaldehyde-d4)–trioxane mixtures were obtained.

A TIME-OF-FLIGHT MASS SPECTROMETER FOR SIMS AND FIELD IONISED NEUTRAL ANALYSIS USING A PULSED LMIS

1987 ◽  
Vol 48 (C6) ◽  
pp. C6-577-C6-582 ◽  
Author(s):  
A. R. Waugh ◽  
D. R. Kingham ◽  
C. H. Richardson ◽  
M. Goff
Keyword(s):  
Mass Spectrometer ◽  
Time Of Flight ◽  
Flight Mass Spectrometer
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