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See detailThe Dissociative Electroionization of NH3 and ND3. A detailed Study of its five Dissociation Channels.
Locht, Robert ULg; Momigny, J.

in Longevialle, P. (Ed.) Advances in Mass Spectrometry. Volume 11A. (1988)

A general view of the results obtained for the dissociative ionization by electron impact on NH3 are presented. All five dissociation channels for the decomposition of the singly ionized NH3+ and the ... [more ▼]

A general view of the results obtained for the dissociative ionization by electron impact on NH3 are presented. All five dissociation channels for the decomposition of the singly ionized NH3+ and the doubly ionized (NH3)2+ are reported. [less ▲]

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See detailThe Dissociative Electroionization of NH3. The NH+ Dissociation Channel.
Locht, Robert ULg; Servais, Christian ULg; Ligot, M. et al

in Gilbody, H. B.; Newell, W. R.; Read, F. H. (Eds.) et al Electronic and Atomic Collisions: Abstracts of Contributed Papers. 15th International Conference on the Physics of Electronic and Atomic Collisions. Brighton, United Kingdom, 1987. (1987)

The dissociative electoionization efficiency of Nh3 in the NH+ channel is reported. The kinetic energy of this fragment ion is measured as a function of the impinging electron energy. Several dissociation ... [more ▼]

The dissociative electoionization efficiency of Nh3 in the NH+ channel is reported. The kinetic energy of this fragment ion is measured as a function of the impinging electron energy. Several dissociation limits are detected. [less ▲]

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See detailThe Dissociative Electroionization of Nitrous Oxide. The N+ and O+ Dissociation Channels.
Locht, Robert ULg; Olivier, J. L.; Momigny, J.

in Schmid, E. R. (Ed.) Book of Abstracts of the 9th International Mass Spectrometry Conference (1982)

The first results on the dissociative elctroionization of nitrous oxide in the N+ and O+ dissociation channels are reported in the 15-32 eV electron energy range. Dissociation mechanisms at several ... [more ▼]

The first results on the dissociative elctroionization of nitrous oxide in the N+ and O+ dissociation channels are reported in the 15-32 eV electron energy range. Dissociation mechanisms at several critical energies are presented. [less ▲]

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See detailThe Dissociative Electroionization of Nitrous Oxide. The O+ Dissociation Channel.
Olivier, J. L.; Locht, Robert ULg; Momigny, J.

in International Journal of Mass Spectrometry and Ion Physics (1983), 46

By electroionization mass spectrometry and ion kinetic energy analysis, the O+ fragment ion formation from N2O has been analyzed. Different appearance energies are measured and interpreted. Between the ... [more ▼]

By electroionization mass spectrometry and ion kinetic energy analysis, the O+ fragment ion formation from N2O has been analyzed. Different appearance energies are measured and interpreted. Between the onset at 15.27 eV and 22 eV only two dissociation limits are involved, i.e. O+(4S)+N2(X1Sigma+/g) at 15.29 eV and O+(2D)+N(X1Sigma+/g) at 18.61 eV. In both cases N2(X1Sigma+/g) is produced in its v=0 up to v=8 vibrational levels. Predissociation of ionic and Rydberg states of N2O are the dominant processes. [less ▲]

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See detailDissociative Electroionization Study in Acetylene. The Production of CH(D)+ in C2H2 and C2D2.
Davister, M.; Locht, Robert ULg

in Andersen, T.; Fastrup, B.; Folkmann, F. (Eds.) et al Electronic and Atomic Collisions: Abstract of contributed Papers. (1993)

An extensive study of the dissociative electroionization of C2H2(D2) in the CH(D)+ producing channel is reported. The translational energy-versus-appearance energy diagram reveals 9 CH+-producing ... [more ▼]

An extensive study of the dissociative electroionization of C2H2(D2) in the CH(D)+ producing channel is reported. The translational energy-versus-appearance energy diagram reveals 9 CH+-producing processes involving C2H2+ and (C2H2)2+ ionic states and is discussed in detail. [less ▲]

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See detailA Dissociative Electroionization Study of Nitrous Oxide. The NO+ and N2+ Dissociation Channels.
Olivier, J. L.; Locht, Robert ULg; Momigny, J.

in Chemical Physics (1982), 68

The decay of N2O into NO+ and N2+ dissociation channels has been investigated by electron impact using ions kinetic energy and mass analysis. The appearance energies of NO+ and N2+ are measured as a ... [more ▼]

The decay of N2O into NO+ and N2+ dissociation channels has been investigated by electron impact using ions kinetic energy and mass analysis. The appearance energies of NO+ and N2+ are measured as a function of the released translational energy. Both decay channels are mainly reached through predissociation of the N2O+ ionic states. In the NO+ decay channel, only one dissociation limit is involved, i.e. NO+(X1Sigma+,v)+N(4S) and hence the repulsive 4Sigma- state is responsible for all the observed phenomena. In the N2+ decay channel, several dissociation limits are involved. Dissociative ionization involving doubly excited states of N2O+ in both dissociation channels are briefly discussed. [less ▲]

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See detailA Dissociative Electroionization Study of Nitrous Oxide. The O+ and N+ Dissociation channels.
Olivier, J. L.; Locht, Robert ULg; Momigny, J.

in Chemical Physics (1984), 84

After the investigation of the decay of N2O into NO+ and N2+ the dissociation channels leading to O+ and N+ are examined by electroionization using ion kinetic energy and mass analysis. Appearance ... [more ▼]

After the investigation of the decay of N2O into NO+ and N2+ the dissociation channels leading to O+ and N+ are examined by electroionization using ion kinetic energy and mass analysis. Appearance energies of O+ and N+ are measured as a function of the kinetic energy of the fragment ions. Predissociation is the main mechanism for ion production in both channels. In the O+ decay channel the 4Sigma- state is an important intermediate. The neutral N2(X1Sigma+/g) mainly appears vibrationally excited. In the N+ dissociation channel, 2Pi states have to play an important role by predissociating the N2O(C2Sigma+) state and the higher-lying doubly excited states of N2O+. [less ▲]

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See detailDissociative Ionization by low energy Electron Impact. Energy Distribution and Appearance Energy of Doubly Ionized Fragments from N2 and O2.
Locht, Robert ULg; Momigny, J.

in Chemical Physics Letters (1979), 66(3), 574-577

Ion energy distributions and threshold energies are measured for the appearance of N2+ from N2. To our knowledge the same data are measured for the first time on O2+ from O2. For both ions a thermal peak ... [more ▼]

Ion energy distributions and threshold energies are measured for the appearance of N2+ from N2. To our knowledge the same data are measured for the first time on O2+ from O2. For both ions a thermal peak is observed in the ion energy distribution having an onset at (61.1+/-0.5) eV and (60.5+/-0.8) eV for the N2+ ion and the O2+ ion respectively. The appearance energy of higher energetic ions is measured and interpreted. [less ▲]

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See detailDissociative Ionization by low energy Electron Impact. Ion Energy Distribution of N++ from N2 and O++ from O2.
Locht, Robert ULg; Momigny, J.

in Electronic and Atomic Collisions: Abstracts of Contributed Papers. (1979)

The kinetic energy distribution of the doubly ionized species N++/N2 and O++/O2 , as produced by electron impact, is reported and discussed.

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See detailThe Dissociative Ionization in Oxygen.
Locht, Robert ULg; Schopman, Joop

in International Journal of Mass Spectrometry and Ion Physics (1974), 15

Dissociative ionization in O2 has been examined by means of a retarding potential lens combined with a quadrupole mass spectrometer. This particular arrangement made possible detailled analysis of the O ... [more ▼]

Dissociative ionization in O2 has been examined by means of a retarding potential lens combined with a quadrupole mass spectrometer. This particular arrangement made possible detailled analysis of the O+ ions kinetic energy distribution and the measurement of threshold energies of O+ ions with known kinetic energy. These two types of informations bring new experimental evidence, besides direct dissociative ionization of O2, for predissociation of the B2Sigma-/g state, the 2Piu state and the c4Sigma-/u state of O2+. A new predissociation of the O2+(2Deltag) state has been found. At low ion energy the predissociation of the 2Phiu state or an autoionizing predissociation is observed. [less ▲]

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See detailThe Dissociative Ionization of C2H2. The C+, C2+ and CH2+ Dissociation Channels. The Vinylidene Ion as a Transient?
Locht, Robert ULg; Davister, M.

in Chemical Physics (1995), 195

The dissociative electroionization of C2H2 has been investigated in the C+, C2+ and CH2+ dissociation channels. Both the translational energy and the appearance energies have been measured. The kinetic ... [more ▼]

The dissociative electroionization of C2H2 has been investigated in the C+, C2+ and CH2+ dissociation channels. Both the translational energy and the appearance energies have been measured. The kinetic energy versus appearance energy diagrams related to these species are discussed in detail and dissociation mechanisms are proposed for all observed onset energies. For the three ionic species, the dissociation pathways leading to the fragmentation of C2H2+ into C+, C2+ and CH2+ successively have to run very likely over an isomerization mechanism of the molecular ion. The isomeric vinylidene structure could be the most probable intermediate. [less ▲]

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See detailThe Dissociative Ionization of C2H2. The H-C2H Binding Energy.
Davister, M.; Locht, Robert ULg

in Cornides, I.; Horvath, G.; Veakey, K. (Eds.) Book of Abstracts. Advances in mass spectrometry Volume 13 (13th IMSC Budapest 94) (1994)

The dissociative electroionization measurements on C2H+/C2H2 are reported. Kinetic energy and appearance energies are measured. On these data the D(H-C2H) binding energy is deduced.

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See detailThe Dissociative Ionization of Carbon Dioxide below 21.22 eV. A high Resolution PIPECO spectroscopic investigation.
Locht, Robert ULg

in International Journal of Mass Spectrometry and Ion Processes (1995), 148

The photoion-photoelectron spectrum of O+, CO+ and CO2+ has been investigated under high resolution conditions. The O+ ion production is found not to be restricted to the CO2+ (C2Sigma+/g,0,0,0 ... [more ▼]

The photoion-photoelectron spectrum of O+, CO+ and CO2+ has been investigated under high resolution conditions. The O+ ion production is found not to be restricted to the CO2+ (C2Sigma+/g,0,0,0) predissociation. The (0,1,0) and (1,0,0) levels are clearly shown to be involved. The CO+ ion production involves all the vibrational states reached in the Franck-Condon region, i.e. up to (2,0,1) at 19.94 eV. The CO2+ molecular ion does not survive the predissociation in the entire range covered in the present work. [less ▲]

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See detailDissociative Ionization of Carbon Disulphide in the Gas Phase. Heat of Formation of the CS Radical.
Hubin-Franskin, Marie-Jeanne ULg; Locht, Robert ULg; Katihabwa, J.

in Chemical Physics Letters (1976), 37(3), 488-493

Measurements of the appearance potentials and the kinetic energies of S+ and CS+ ions formed by electron impact on carbon disulphide in the gas phase lead us to propose a value as low as 34+/-6 kcal/mole ... [more ▼]

Measurements of the appearance potentials and the kinetic energies of S+ and CS+ ions formed by electron impact on carbon disulphide in the gas phase lead us to propose a value as low as 34+/-6 kcal/mole for the heat of formation of the CS radical in its ground electronic state. It is also shown that the predissociation of the A2Piu or X2Pig and the B2Sigmau/+ molecular ion states by a repulsive 4Sigma- state giving rise to S+ ions, observed through metastastable ions study, occur at 13.45 eV and 14.55 eV respectively. [less ▲]

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See detailThe Dissociative Ionization of Carbon Monoxide.
Locht, Robert ULg

in Chemical Physics (1977), 22

The dissociative ionization of CO by low energy electron impact into C+ and O (or O-) and O+ and C (or C-) is investigated using ion energy and mass analysis. The kinetic energy distributions are studied ... [more ▼]

The dissociative ionization of CO by low energy electron impact into C+ and O (or O-) and O+ and C (or C-) is investigated using ion energy and mass analysis. The kinetic energy distributions are studied as a function of the impinging electron energy. The threshold energies of C+ and O+ are measured as a function of the released kinetic energy. The formation of the products in their ground level and with a small amount of kinetic energy mainly occurs through predissociation. The CO+ electronic states involved in these processes are tentatively identified. New evidences have been found for the importance of dissociative ionization via autoionization. [less ▲]

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See detailThe Dissociative Ionization of CH3F. A Mass Spectrometric Photoionization study using Synchrotron Radiation.
Locht, Robert ULg; Rühl, E.; Momigny, J. et al

in Gilbody, H. B.; Newell, W. R.; Read, F. H. (Eds.) et al Electronic and Atomic Collisions: Abstracts of Contributed Papers. (1987)

The dissociation channel of CH3F+hnu->CH3++F has been investigated by photoionization using synchrotron radiation. The kinetic energy-versus-appearance energy diagram of CH3+ has been reported and ... [more ▼]

The dissociation channel of CH3F+hnu->CH3++F has been investigated by photoionization using synchrotron radiation. The kinetic energy-versus-appearance energy diagram of CH3+ has been reported and analyzed. [less ▲]

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See detailDissociative Ionization of CH4 and CD4 by low energy Electron impact. The Proton Formation.
Olivier, J. L.; Locht, Robert ULg; Momigny, J.

in Electronic and Atomic Collisions: Abstract of contributed papers. Volume 1. (1979)

The kinetic energy distributions of H+(D+)/CH(D)4 are produced at variable electron impact energies. Two different features are observed and are interpreted in terms of dissociative autoionization.

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See detailThe dissociative Ionization of CO by Electron Impact: the C+ ion formation.
Locht, Robert ULg; Dürer, J. M.

in Risley, J. S.; Geballe, R. (Eds.) Electronic and Atomic Collisions. Abstracts of papers of the IXth International Conference on the Physics of Electronic and Atomic Collisions. (1975)

The dissociative ionization of CO by low-energy electron impact is presented. The results on the dissociation channel of C+ formation has been investigated and is discussed.

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See detailThe Dissociative Ionization of Methyl Fluoride. The formation of CH2+ and CH3+.
Locht, Robert ULg; Momigny, J.

in International Journal of Mass Spectrometry and Ion Physics (1986), 71

The decay of ionized CH3F was investigated in the CH2+ and CH3+ dissiciation channels by electronionization and fixed wavelength photoionization using HeI and NeI resonance lines. The translational energy ... [more ▼]

The decay of ionized CH3F was investigated in the CH2+ and CH3+ dissiciation channels by electronionization and fixed wavelength photoionization using HeI and NeI resonance lines. The translational energy spectra, ionization efficiency curves and kinetic energy-versus-appearance enegy diagrams of both ions were measured. Although dissociative autoionization is the prominent dissociation mechanism for the appearance of CH2+ and CH3+, direct dissociative ionization is observed for CH2+ at 23.4 eV and for CH3+ at 16.5 eV. [less ▲]

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See detailDissociative Ionization of N2 by Electron Impact.
Locht, Robert ULg; Schopman, Joop

in Cobic, B. C.; Kurepa, M. V. (Eds.) Electronic and Atomic Collisions. Abstracts of Papers: VIII ICPEAC, Beograd, 1973. Volume 1. (1973)

The dissociative ionization by electron impact of N2 is presented: the kinetic energy distribution of N+ and the major features characterized by their energy.

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