Gas‐phase ion‐atom reactions

Sablier, Michel; Rolando, Christian

doi:10.1002/mas.1280120503

Cited by 24 publications

(20 citation statements)

References 89 publications

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“…10 and references therein. The reverse reaction CH + + H → C + + H 2 + (0.398 ± 0.003) eV (1) represents an important destruction mechanism of CH + the formation of which is poorly understood in diffuse interstellar molecular clouds. Simple models underestimate the observed abundances and, therefore, it is assumed that shock waves, turbulences or UV radiation must play a role.…”

Section: Ch + + H Ch + + Dmentioning

confidence: 99%

“…With the AB-22PT technique the rate coefficient for reaction (1) has been determined at 50 K and 100 K. For T H = T ion = 50 K a rate coefficient of 1.3 × 10 -9 cm 3 s -1 has been obtained. At an accommodator temperature of 100 K and a trap temperature of 80 K, a value of 8.7 × 10 -10 cm 3 s -1 has been measured.…”

Section: Ch + + H Ch + + Dmentioning

confidence: 99%

“…A general review of ion-atom reactions has been published. 1 Except early ICR studies 2 nique. Using the selected ion flow drift tube approach (SIFDT) reactions can be studied at superthermal energies.…”

Section: Introductionmentioning

confidence: 99%

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Interactions of Ions With Hydrogen Atoms

Luca

Borodi

Gerlich

2006

Photonic, Electronic and Atomic Collisions

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This progress report presents recent advances in developing a versatile technique for investigation of collisions of ions with open shell neutral intermediates. Combination of a 22-pole ion trap with a beam of H atoms allows accurate determination of rate coefficients at temperatures between 10 K and 300 K. New experimental results on hydrogen abstraction in collisions of CH + , CH 4 + and CH 5 + ions with H atoms are reported at temperatures between 10 K and 100 K. In the case of CH + and CH 4 + , large rate coefficients of 1.3 × 10-9 cm 3 s-1 and 6.0 × 10-10 cm 3 s-1 have been obtained at 50 K. CH + reacts with D atoms with a total rate coefficient of 2.4 × 10-9 cm 3 s-1 the branching ratio being 50 % for hydrogen abstraction and 50 % for atom exchange. For collisions of CH 5 + with H atoms rate coefficients of 9 × 10-12 , 1.3 × 10-11 , and 2.3 × 10-11 cm 3 s-1 have been determined at trap and nozzle temperatures of 10, 50, and 100 K, respectively. This indicates that this reaction is almost thermoneutral in contrast to thermodynamical data reported in the literature.

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Section: Ch + + H Ch + + Dmentioning

confidence: 99%

Section: Ch + + H Ch + + Dmentioning

confidence: 99%

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Interactions of Ions With Hydrogen Atoms

Luca

Borodi

Gerlich

2006

Photonic, Electronic and Atomic Collisions

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“…There are several reports on the interactions between thermal H . radicals and various ions, as probed by mass spectrometry 11–17. In these studies, a microwave discharge in H 2 or hydrocarbon gases has been the sole method for generation of H .…”

mentioning

confidence: 99%

Generation of hydrogen radicals for reactivity studies in Fourier transform ion cyclotron resonance mass spectrometry

Demirev

2000

Rapid Commun. Mass Spectrom.

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An efficient technique for generation of H* (D*) radicals in Fourier transform ion cyclotron resonance (FTICR) mass spectrometry is described. The method allows the probing of the reactivity of gas-phase H* radicals towards various ions isolated in the cell of an FTICR mass spectrometer. Results on interactions of H* and D* radicals with trapped positive or negative C60 fullerene ions, as well as singly charged peptide ions, are presented. Hydrogen radical addition or H/D-exchange reactions between trapped ions and free H* (D*) radicals were observed. Potential implementation of the technique for probing the gas-phase three-dimensional structures of polyatomic ions is discussed as well.

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“…Investigating the properties of reactions that take place in naturally-occurring cold environments is necessary in order to accurately model their chemistry. [1][2][3][4][5][6][7][8][9][10] Even now, many of the reactions postulated to be of astrochemical importance are yet to be experimentally measured under cold conditions.…”

Section: Introductionmentioning

confidence: 99%