Photoionization; Electron impact; Double ionization; NH3; CO2
Abstract :
[en] The double ionization of NH3 and CO2 is investigated by photoionization in the 30-60 eV photon energy range and electron impact from 30-100 eV. The lowest onset for (NH3)2+ formation, measured for the first time by photoionization, is at 34.5+/-0.2 eV. By electron impact this threshold is 34.8+/0.2 eV. For (CO2)2+ this onset is measured at 37.5+/-0.1 eV by photoionization and at 38.0+/-0.1 eV by electron impact. Close to these onsets two double ionization energies are observed: 38.5+/-0.1 eV by photoionization and 39.5+/-0.2 eV by electron impact. These have probably to be ascribed to two different (CO2)2+ states. Higher-lying doubly ionized states of CO2 are detected in the 60-100 eV electron impact energy range.
Research center :
Laboratoire de dynamique Moléculaire, BESSY
Disciplines :
Chemistry
Author, co-author :
Locht, Robert ; Université de Liège - ULiège > Département de Chimie (Faculté des sciences) > Laboratoire de Dynamique Moléculaire (Sciences)
Davister, M.
Denzer, W.
Jochims, H.-W.; Freie Universität Berlin > Institut für Physikalische Chemie
Baumgärtel, H.; Freie Universität Berlin > Institut für Physikalische Chemie
Language :
English
Title :
About the Double Ionization of Ammonia and Carbon Dioxide. A Comparison between Photoionization and Electron Impact.
Alternative titles :
[fr] De l'ionisation double de l'Ammoniac et du Monoxyde de Carbone. Une comparaison entre les résultats de la photoionisation et de l'impact électronique.
Publication date :
1989
Journal title :
Chemical Physics
ISSN :
0301-0104
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
138
Pages :
433-440
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
FRFC, ARC, FNRS, Bundes Ministerium für Forschung und Technologie
Commentary :
- Printed version of reprint available on request
- Version imprimée du tiré-à-part disponible sur demande
