Reaction Dynamics of the Dichlorocarbene Anion Using tandem Mass Spectrometry.

Leyh, Bernard; Mélon, Pierre

doi:10.1002/oms.1210280508

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Article (Scientific journals)

Reaction Dynamics of the Dichlorocarbene Anion Using tandem Mass Spectrometry.

Leyh, Bernard; Mélon, Pierre

1993 • In Organic Mass Spectrometry, 28, p. 513-522

Peer reviewed

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https://hdl.handle.net/2268/9348

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10.1002/oms.1210280508

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Keywords :

Tandem mass spectrometry; charge transfer; kinetic energy release,; excited electronic states

Abstract :

[en] The dissociation dynamics of CCl2- anions were studied under various internal energy conditions. This study involved the measurement of daughter-ion spectra and branching ratios and of the amount of kinetic energy released (KER) on the fragments. The competition between C and Cl loss for CCl2- ions created by many of the following sequence of processes: CCl4->CCl2+->(G=Xe, Kr C6H6)->CCl2--> fragments (1); CCl4->(CCl2--+[Cl,Cl]+;CCl2-; CCl2- (Ne)-> Fragments (2); CCl4->(CCl2)2+ (C6H6)->CCl2--> fragments (3) was particularly investigated. For process (1), the amount of fragmentating CCl2- ions is 8-10 times larger with Kr than with Xe or C6H6. The KER for Cl loss is smaller than 0.20 eV with the three target gases used. For the loss of C, the KER is much larger (0.7 eV). This KER is, however, equal to 0.21 eV for the collisionally activated C loss in process (2). For this latter process, the C loss vs Cl loss branching ratio decreases with increasing internal energy. The KERs measured for process (3) are vary similar to those obtained for process (1). It is suggested that repulsive or slightly bound excited states which correlate directly to the Cl2-(X2Sigma+)+C asymptote and which are vibronically coupled to the ground state play an important role in these dissociation processes.

Research center :

Laboratoire de Dynamique Moléculaire

Disciplines :

Chemistry

Author, co-author :

Leyh, Bernard ; Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de dynamique moléculaire

Mélon, Pierre

Language :

English

Title :

Reaction Dynamics of the Dichlorocarbene Anion Using tandem Mass Spectrometry.

Alternative titles :

[fr] Dynamique de réaction des anions Dichlorocarbène au moyen d'un spectromètre de masse à double focalisation.

Publication date :

1993

Journal title :

Organic Mass Spectrometry

ISSN :

0030-493X

Publisher :

John Wiley & Sons Ltd, United Kingdom

Volume :

Pages :

513-522

Peer reviewed :

Peer reviewed

Funders :

FRFC - Fonds de la Recherche Fondamentale Collective [BE]

Available on ORBi :

since 21 March 2009

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