Infrared Multiphoton Dissociation Spectra as a Probe of Ion Molecule Reaction Mechanism:  The Formation of the Protonated Water Dimer via Sequential Bimolecular Reactions with 1,1,3,3−Tetrafluorodimethyl Ether

2007 ◽  
Vol 111 (36) ◽  
pp. 8792-8802 ◽  
Author(s):  
R. A. Marta ◽  
T. B. McMahon ◽  
T. D. Fridgen
Keyword(s):  
Reaction Mechanism ◽  
Infrared Multiphoton Dissociation ◽  
Water Dimer ◽  
Bimolecular Reactions ◽  
Molecule Reaction ◽  
Multiphoton Dissociation

Product distributions and isotopic selectivities in ir multiphoton dissociation of pentafluoroiodoethane

1981 ◽  
Vol 59 (9) ◽  
pp. 1307-1310 ◽  
Author(s):  
E. Weinberg ◽  
M. Gauthier ◽  
P. A. Hackett ◽  
C. Willis
Keyword(s):  
Reaction Mechanism ◽  
Bond Cleavage ◽  
Thermal Dissociation ◽  
Infrared Multiphoton Dissociation ◽  
High Fluence ◽  
Reaction Products ◽  
Product Distributions ◽  
Multiphoton Dissociation

Infrared multiphoton dissociation of pentafluoroiodoethane leads to a complex array of reaction products. For photolysis in the v4 band the reaction mechanism involves C2F5—I bond cleavage followed by thermal dissociation of C2F5 radicals. For irradiation within the v3 band at high fluence, efficient secondary photolysis of C2F5 radicals is postulated. At lower fluences the dissociation is isotopically selective leading to C4F10 enriched in carbon-13.

A comparative ion chemistry study of acetone, diacetone alcohol, and mesityl oxide

1986 ◽  
Vol 64 (10) ◽  
pp. 1979-1988 ◽  
Author(s):  
Afaf Kamar ◽  
Alexander Baldwin Young ◽  
Raymond Evans March
Keyword(s):  
Infrared Multiphoton Dissociation ◽  
Mesityl Oxide ◽  
Alternative Form ◽  
Dehydration Process ◽  
Ion Chemistry ◽  
Bimolecular Reactions ◽  
Common Structure ◽  
Diacetone Alcohol ◽  
Multiphoton Dissociation ◽  
Ion Species

The evolution of ion species by unimolecular and bimolecular reactions, both concurrent and sequential, has been investigated for each of 2-propanone, d6-2-propanone, 4-hydroxy-4-methyl-2-pentanone, and 4-methyl-3-penten-2-one. Infrared multiphoton dissociation (IRMPD) has been used in order to differentiate between gaseous ionic isomers. It is concluded that the isomeric species, protonated 2-propanone dimer and protonated 4-hydroxy-4-methyl-2-pentanone, both of m/z 117, are of different structures. The ion species C6H11O+ of m/z 99, and its perdeuterated analogue, which is observed in all three systems, may exist in two forms, one of which is unique to 2-propanone while an alternative form appears to be common to 4-hydroxy-4-methyl-2-pentanone and 4-methyl-3-penten-2-one. The ion species of m/z 83 (C5H7O+) which is observed only in the latter two systems only could not be differentiated and may have a common structure. In the protonated dimers of 2-propanone and 4-hydroxy-4-methyl-2-pentanone, evidence obtained by IRMPD indicates that the activation energy for dedimerization (134 kJ mol−1) is less than that for the dehydration process.

Chloroform Infrared Multiphoton Dissociation in the Presence of O2 and NO2¶

2005 ◽  
Vol 81 (4) ◽  
pp. 789 ◽  
Author(s):  
V. Mariana Freytes ◽  
Jorge Codnia ◽  
M. Laura Azcárate
Keyword(s):  
Infrared Multiphoton Dissociation ◽  
Multiphoton Dissociation

Amplification of Infrared Multiphoton Dissociation Efficiency in a Quadruple Ion Trap Using IR-Active Ligands

2006 ◽  
Vol 78 (24) ◽  
pp. 8512-8517 ◽  
Author(s):  
Michael Pikulski ◽  
Jeffrey J. Wilson ◽  
Apolonio Aguilar ◽  
Jennifer S. Brodbelt
Keyword(s):  
Ion Trap ◽  
Infrared Multiphoton Dissociation ◽  
Dissociation Efficiency ◽  
Multiphoton Dissociation

Interrogation of N-Linked Oligosaccharides Using Infrared Multiphoton Dissociation in FT-ICR Mass Spectrometry

2006 ◽  
Vol 78 (14) ◽  
pp. 4990-4997 ◽  
Author(s):  
Katherine S. Lancaster ◽  
Hyun Joo An ◽  
Bensheng Li ◽  
Carlito B. Lebrilla
Keyword(s):  
Mass Spectrometry ◽  
Infrared Multiphoton Dissociation ◽  
Multiphoton Dissociation ◽  
Ft Icr
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