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See detailMass Spectrometric Study of Ion-Pair Processes in Diatomic Molecules: H2, CO, NO and O2.
Locht, Robert ULg; Momigny, Jacques

in International Journal of Mass Spectrometry and Ion Physics (1971), 7

The appearance of ion-pair processes has been studied in H2, CO, NO and O2. The different thresholds have been interpreted. Convolution and deconvolution techniques have been applied to the ionization ... [more ▼]

The appearance of ion-pair processes has been studied in H2, CO, NO and O2. The different thresholds have been interpreted. Convolution and deconvolution techniques have been applied to the ionization efficiency curves to determine (i) a method for the determination of the threshold energy and (ii) the kinetic energy distribution of the fragments. [less ▲]

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See detailMass Spectrometric determination of the Electronaffinities of Radicals.
Locht, Robert ULg; Momigny, Jacques

in Chemical Physics Letters (1970), 6(4), 273-276

By mass spectrometric study of the appearance of C2-, CH- and C2H- from CH4, C2H2, C2H4, C2H3X (X=F, Cl) the following electronaffinities have been determined: EA(CH)=(2.6+/-0.3) eV, EA(C2)=(3.3+/-0.2) eV ... [more ▼]

By mass spectrometric study of the appearance of C2-, CH- and C2H- from CH4, C2H2, C2H4, C2H3X (X=F, Cl) the following electronaffinities have been determined: EA(CH)=(2.6+/-0.3) eV, EA(C2)=(3.3+/-0.2) eV and EA(C2H)=(2.1+/-0.3) eV. Some evidence is brought to the existence of electronic excited states of these ions. An evaluation of these negative ions dissociation energy in their ground electronic state is given and is found to be of the order of magnitude of the corresponding isoelectronic molecular species dissociation energy. [less ▲]

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See detailPositive and Negative Ion Formation in Ketene by Electron Impact
Collin, Jacques ULg; Locht, Robert ULg

in International Journal of Mass Spectrometry and Ion Physics (1970), 3

Dissociation processes leading to positive and negative ions in ketene are discussed on the basis of appearance potential measurements. All important positive and negative ions are examined. For the ... [more ▼]

Dissociation processes leading to positive and negative ions in ketene are discussed on the basis of appearance potential measurements. All important positive and negative ions are examined. For the negative ions, only resonance dissociative attachment processes are considered. Excited electronic states of negative ions, in particular for O-, may explain the structure observed in the dissociative attachment efficiency curves. [less ▲]

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See detailMass Spectrometric Study of Dissociative Attachment in Diatomic Molecules. II. NO and O2.
Locht, Robert ULg; Momigny, Jacques

in International Journal of Mass Spectrometry and Ion Physics (1970), 4

The DA processes of O- ions in NO and O2 are investigated using a 60° sector field mass spectrometer. In NO O- appears at (7.43+/-0.2) eV and the analysis of the DA curve indicates the probable existence ... [more ▼]

The DA processes of O- ions in NO and O2 are investigated using a 60° sector field mass spectrometer. In NO O- appears at (7.43+/-0.2) eV and the analysis of the DA curve indicates the probable existence of two other processes at 8.1 eV and 9.0 eV. In O2 only one process is observed at (3.45+/-0.3) eV. For both molecules an attempt is made to establish the shape of the potential energy curve of the electronic states of the transient negative molecular species involved. [less ▲]

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See detailEtude par spectrométrie de masse de l'Apparition des ions négatifs par Attachement Electronique Dissociatif dans des molécules polyatomiques.
Locht, Robert ULg

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1970), LVI(8), 788-817

The appearance of negative ions by dissociative electron attachment has been studied by electron impact on CH4, C2H2, C2H4 and C2H3X (X=F, Cl) using a sector field mass spectrometer. An interpretation has ... [more ▼]

The appearance of negative ions by dissociative electron attachment has been studied by electron impact on CH4, C2H2, C2H4 and C2H3X (X=F, Cl) using a sector field mass spectrometer. An interpretation has been attempted for the measured appearance potentials. The electronaffinity of C2 and C2H is found to be (3.3+/-0.3) eV and (2.3+/-0.2) eV respectively. Some evidence is brought for the existence of excited electronic states in polyatomic negative ions. [less ▲]

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See detailMass Spectrometric Study of Dissociative Attachment in Diatomic Molecules:I. CO and H2
Locht, Robert ULg; Momigny, Jacques

in International Journal of Mass Spectrometry and Ion Physics (1969), 2

A study of the shape of the DA peaks leads to a general method for the determination of the threshold of a DA process. In order to test this method, the negative ions appearing in CO and H2 have been ... [more ▼]

A study of the shape of the DA peaks leads to a general method for the determination of the threshold of a DA process. In order to test this method, the negative ions appearing in CO and H2 have been investigated, using a sector field instrument. An attempt has been made to establish the relative positions of the potential energy curves (using the Morse function) for the electronic states involved in the processes observed [less ▲]

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See detailEtude par Spectrométrie de Masse des Mécanismes d'Apparition des Ions Négatifs dans le Méthane.
Locht, Robert ULg

in Extrait du Bulletin de la Société Royale des Sciences de Liège (1966), 35(11-12), 764-777

The negative fragment ions appearing in methane have been investigated using a sector field mass spectrometer. By recording the ionzation efficiency curves of each ion it has been possible to determine ... [more ▼]

The negative fragment ions appearing in methane have been investigated using a sector field mass spectrometer. By recording the ionzation efficiency curves of each ion it has been possible to determine the appearance potentials for several processes. Interpretations of the mechanisms for these critical potentials have been attempted. [less ▲]

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See detailCinétique de la Décomposition d'ions Métastables polyatomiques
Locht, Robert ULg

Master's dissertation (1965)

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