Electron capture induced decomposition of the benzene C6H62+ ion

Vékey, Károly; Brenton, A.G.; Beynon, J. H.

doi:10.1021/j100407a022

Cited by 66 publications

(52 citation statements)

References 7 publications

(7 reference statements)

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“…Because of the heterogeneity of the processes occurring in atmospheric pressure and ambient ionization, the extent of ion activation is better described by P(E), the normalized probability distribution that an ion has a given E int [10,19]. Many methods have been developed to determine P(E) including the "thermometer molecule" method [20], the "deconvolution method" [21], and the method used in this study, the "survival yield" (SY) method [22,23]. The SY method assumes that: (1) all ions with E int below a critical energy, E o , do not dissociate and appear as intact ionic species, and (2) all ions with E int above E o will dissociate into fragment ions [10,12].…”

Section: Survival Yield Methods and Data Analysismentioning

confidence: 99%

Comparison of the internal energy deposition of direct analysis in real time and electrospray ionization time-of-flight mass spectrometry

Harris¹,

Hostetler²,

Hampton³

et al. 2010

J Am Soc Mass Spectrom

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The internal energy (E int ) distributions of a series of p-substituted benzylpyridinium ions generated by both direct analysis in real time (DART) and electrospray ionization (ESI) were compared using the "survival yield" method. DART mean E int values at gas flow rates of 2, 4, and 6 L min Ϫ1 , and at set temperatures of 175, 250, and 325°C were in the 1.92-2.21 eV range. ESI mean E int at identical temperatures in aqueous and 50% methanol solutions ranged between 1.71 and 1.96 eV, and 1.53 and 1.63 eV, respectively. Although the results indicated that ESI is a "softer" ionization technique than DART, there was overlap between the two techniques for the particular time-of-flight mass spectrometer used. As a whole, there was an increase in E int with increasing reactive and drying gas temperatures for DART and ESI, respectively, indicating thermal ion activation. Three dimensional computational fluid dynamic simulations in combination with direct temperature measurements within the DART ionization region revealed complex inversely coupled fluid-thermal phenomena affecting ion E int values during atmospheric transport. Primarily, that DART gas temperature in the ionization region was appreciably less than the set gas temperature of DART due to the set gas flow rates. There was no evidence of E int deposition pathways from metastable-stimulated desorption, but fragmentation induced by high-energy helium metastables was observed at the highest gas flow rates and temperatures. (J Am Soc Mass Spectrom 2010, 21, 855-863)

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Section: Survival Yield Methods and Data Analysismentioning

confidence: 99%

Comparison of the internal energy deposition of direct analysis in real time and electrospray ionization time-of-flight mass spectrometry

Harris¹,

Hostetler²,

Hampton³

et al. 2010

J Am Soc Mass Spectrom

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“…These experiments revealed significant cross sections for electron transfer from the neutral to the dication: [58][59][60][61][62][63][64] CF 2 2+ + Ar → CF 2 + + Ar + , ͑1͒ CF 2 2+ + Xe → CF + + F + Xe + . ͑2͒…”

Section: Introductionmentioning

confidence: 99%

The formation of NO+ from the reaction of N22+ with O2

Ricketts

Harper

et al. 2005

The Journal of Chemical Physics

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Guided-ion beam study of the O 2 + +C 2 H 2 charge-transfer and chemical reaction channels J. Chem. Phys. 110, 4291 (1999) We have studied the potentially ionospherically significant reaction between N 2 2+ with O 2 using position-sensitive coincidence spectroscopy. We observe both nondissociative and dissociative electron transfer reactions as well as two channels involving the formation of NO + . The NO + product is formed together with either N + and O in one bond-forming channel or O + and N in the other bond-forming channel. Using the scattering diagrams derived from the coincidence data, it seems clear that both bond-forming reactions proceed via a collision complex ͓N 2 O 2 ͔ 2+ . This collision complex then decays by loss of a neutral atom to form a daughter dication ͑NO 2 2+ or N 2 O 2+ ͒, which then decays by charge separation to yield the observed products.

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“…Therefore, the internal energy available for deposition into M Cž varies with the ionization energy of N. 107,109,111,112 This overall process has been titled electron capture-induced dissociation (ECID). Unfortunately, this is a somewhat misleading description as it would be more accurately termed electron transfer-induced dissociation.…”

mentioning

confidence: 99%

“…107,112,113 ECID products formed in the second field-free region were analyzed by scanning the electrostatic analyzer (ESA) voltages between E and 2E, a range of potentials within which the singly charged ions formed from doubly charged precursor ions in the second field-free region are transmitted. Products in this kinetic energy-to-charge region can also be formed via the charge separation process of M 2C to generate m 1 C and m 2 C .…”

mentioning

confidence: 99%

“…113 In the last two decades, ECID has been applied for the characterization of the structures of doubly charged precursor ions, 107,116,117 differentiation of isomers 112,118 and the determination of fragmentation pathways. 114,119 It is possible to use ECID as an alternative to charge stripping for the determination of the ionization energies of singly charged ions.…”

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Charge permutation reactions in tandem mass spectrometry

McLuckey

2004

J. Mass Spectrom.

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Central to the tandem mass spectrometry experiment is the process that gives rise to product ions, i.e. the reaction intermediate to stages of mass analysis. Changes in mass or charge of the parent ion (or both) are generally readily detected by all forms of tandem mass spectrometry. Charge changing, or charge permutation, reactions have a long history in mass spectrometry. However, with the advent of new ionization methods, such as electrospray ionization, and the expansion of tandem mass spectrometry instrumentation to include ion trapping instruments, the past decade has seen a major increase in the types of charge permutation reactions that can be studied. Most charge permutation reactions involve electrons or protons as the charge mediating agents. This report, therefore, provides an overview of charge permutation reactions involving protons or electrons. Particular emphasis is placed on processes that involve interactions of precursor ions with gaseous neutral species, electrons or oppositely charged ions. Charge permutation reactions involving electron gain/loss are described first according to a rough order of the energy required for the reaction beginning with the most endoergic reactions and ending with the most exoergic reactions. An analogous approach is then taken with charge permutation reactions involving proton gain/loss. Important charge permutation reactions discussed herein, among others, include those referred to as charge inversion, charge stripping, electron capture dissociation, collision-induced ionization and charge separation. These reaction types, and others described herein, are the subjects of active research and are also finding use in many current areas of application.

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Electron capture induced decomposition of the benzene C6H62+ ion

Cited by 66 publications

References 7 publications

Comparison of the internal energy deposition of direct analysis in real time and electrospray ionization time-of-flight mass spectrometry

Comparison of the internal energy deposition of direct analysis in real time and electrospray ionization time-of-flight mass spectrometry

The formation of NO+ from the reaction of N22+ with O2

Charge permutation reactions in tandem mass spectrometry

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