Unimolecular and bimolecular reactions in the C6H6+· system. Experiment and theory

Jarrold, Martin F.; Wagner‐Redeker, Winfried; Illies, Andreas J.; Kirchner, Nicholas J.; Bowers, Michael T.

doi:10.1016/0168-1176(84)80020-8

Cited by 54 publications

(34 citation statements)

References 53 publications

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“…Figure 2 shows an example of a MIKE spectrum for electron-induced ionization and dissociative ionization of mass-selected C 60 + to C 60 2+ and fragments thereof. Product KERDs were determined from the first derivatives of the metastable ion peak shapes [24][25][26] and average KER values were deduced from the first moments of these KERDs. Further details of the data handling and data…”

Section: Methodsmentioning

confidence: 99%

Kinetic energy releases and electron-induced decay of C60z+

Matt

Parajuli

Stamatovic

et al. 1999

Eur. J. Mass Spectrom.

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Using a high performance electron gun, electron-induced ionization and excitation of fullerene ion beams is achieved in the second field-free region of a reversed-geometry double-focusing mass spectrometer. Excitation of mass-selected C 60 z+ ion beams leads to consecutive C 2 eliminations, which are observed in mass-analyzed ion kinetic energy (MIKE) spectra. Electron-induced decay of the ions takes place on a short time scale of 0-3 µs. Average kinetic energy release (KER) values were determined for the electron-induced C 2 eliminations from C 60 z+ ions with z = 2-4 and were invariably found to be higher than for the corresponding spontaneous eliminations. The results are interpreted as being due to a time-dependent KER, since the non-fixed energy in the transition state is increased for higher internal energies and shorter lifetimes of the reactant ions. These results are compared with time-resolved KER values obtained previously, using an ion trap/reflectron instrument, for C 2 elimination from C 60 +. The two sets of data are modeled by finite heat bath theory (FHBT) using calculated rate energy dependencies. Calculations are performed using currently available information on the activation parameters. The dissociation is modeled with an Arrhenius pre-exponential factor, A = 5 × 10 19 s-1 (at a temperature k B T = 0.2 eV) and a vaporization (activation) energy ∆E vap = 10.3 eV. Modeling the data necessitates inclusion of radiative decay in parallel with the dissociation. Radiative decay is dominant at times longer than a few microseconds.

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Section: Methodsmentioning

confidence: 99%

Kinetic energy releases and electron-induced decay of C60z+

Matt

Parajuli

Stamatovic

et al. 1999

Eur. J. Mass Spectrom.

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“…In subsequent work, they applied a related model to the dissociations of C 4 H + 6 146 and C 6 H + 6 . 147 The implementations for the inner transition state were purely empirical, but did provide clear evidence for its kinetic importance.…”

Section: Ion-molecule Reactionsmentioning

confidence: 99%

Theory of Low Temperature Gas-Phase Reactions

Klippenstein¹,

Georgievskii²

2008

Low Temperatures and Cold Molecules

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“…The benzene ion dissociations have been studied experimentally in great detail. 44,[75][76][77] Direct decay rate measurements for the H-loss channel have not been possible with the PEPICO technique because of massresolution problems. This channel, Reaction (10), was studied with energy-selected ions using multiphoton 44,[78][79][80][81] Resonance-enhanced two-photon excitation led to production of benzene ions with practically no internal (vibrational) energy.…”

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confidence: 99%

Kinetic Shifts

Lifshitz

2002

Eur J Mass Spectrom (Chichester)

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The kinetic shift is the excess energy required to observe detectable dissociation within a certain experimental time frame. Kinetic shifts are of central importance when energetic attributes are deduced from appearance energy measurements. Their importance has become of renewed interest since larger molecules are being studied mass spectrometrically. This is a review paper on the topic of kinetic shifts. It is made up of the following sections: Introduction, Definitions, Experimental methods, Statistical theories, Examples: Aromatic and polycyclic aromatic hydrocarbons, fullerenes, metal cation–water, –alcohol and –ether complexes, Conclusions.

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Unimolecular and bimolecular reactions in the C6H6+· system. Experiment and theory

Cited by 54 publications

References 53 publications

Kinetic energy releases and electron-induced decay of C60z+

Kinetic energy releases and electron-induced decay of C60z+

Theory of Low Temperature Gas-Phase Reactions

Kinetic Shifts

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