Article (Scientific journals)
The Dissociative Electroionization of C2H2, C2D2 and C2HD. Investigation of the [C2H(D)]+ and [H(D)]+ Dissociation Channels. The (D)H-C2H(D) binding energy.
Davister, M.; Locht, Robert
1994In Chemical Physics, 189, p. 805-824
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Keywords :
Electroionization; Dissociation; Kinetic energy; Appearance energy; C2H(D)+/C2H(D)2; H(D)+/C2H(D)2; Double ionization of C2H2; double ionization of C2H
Abstract :
[en] The dissociative electroionization of C2H2 in the H+ and C2H+ dissociation channels has been extensively investigated in C2H2 and C2D2. The kinetic energy distributions and ionization efficiency curves of both species were examined in detail. The H(D)+ ion shows its lowest onset energy at 18.93+/-0.2 eV whereas the C2H+ is produced at 17.30+/-0.11 eV. For the H+-producing channel the kinetic energy (KE) versus the appearance energy (AE) diagram is obtained, extensively discussed and the bond dissociation energy D(H-C2H)= 5.33+/-0.23 eV is estimated. This value is compared and discussed with respect to the values found in the literature. Predissociation and dissociative autoionization are the dominant H+-producing mechanisms. At high electron energies doubly ionized states of C2H2 are involved. For C2H+, beside the threshold at 17.30+/0.11 eV a new onset at 18.27+/0.10 eV is observed. The ionization efficiency of the doubly ionized molecular ion is observed for the first time in C2HD isotopic species.
Research center :
Laboratoire de Dynamique Moléculaire
Disciplines :
Chemistry
Author, co-author :
Davister, M.
Locht, Robert  ;  Université de Liège - ULiège > Département de Chimie (Faculté des sciences) > Laboratoire de Dynamique Moléculaire (Sciences)
Language :
English
Title :
The Dissociative Electroionization of C2H2, C2D2 and C2HD. Investigation of the [C2H(D)]+ and [H(D)]+ Dissociation Channels. The (D)H-C2H(D) binding energy.
Alternative titles :
[fr] L'électroionisation dissociative de C2H2, C2D2 et C2HD. L'étude des canaux de dissociation de [C2H(D)]+ et [H(D)]+. L'énergie de dissciation (D)H-C2H(D).
Publication date :
1994
Journal title :
Chemical Physics
ISSN :
0301-0104
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
189
Pages :
805-824
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
ARC, FRFC
Commentary :
- Printed version of reprint available on request - Version imprimée du tiré-à-part disponible sur demande
Available on ORBi :
since 30 March 2009

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