References of "Momigny, Jacques"
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See detailThe Dissociative Ionization of Nitrogen.
Locht, Robert ULg; Schopman, Joop; Wankenne, H. et al

in Chemical Physics (1975), 7

Energy distributions and appearance potentials of N+ ions produced by low-energy electron impact on N2 have been measured. At least five dissociaton limits were detected either directly or by ... [more ▼]

Energy distributions and appearance potentials of N+ ions produced by low-energy electron impact on N2 have been measured. At least five dissociaton limits were detected either directly or by extrapolation of the 1/2 slope straight lines drawn through the kinetic energy versus appearance potential energy diagram. Fine structure observed at low energy has been interpreted by the predissociation of at least two N2+ excited states one of which being the well-known C2Sigmau/+ state. One of the others could be a 2Piu state predissociated to the dissociation limit at 24.34 eV. Close correlation between the results of the present work and the photoelectron spectroscopic observations could be done over the electron energy range between 24.3 eV and 36 eV and assignments are discussed in detail. [less ▲]

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See detailAbout the use of the empirical relations hnu(CT/Max)=f(ID) for the interpretation of ionization potentials.
Locht, Robert ULg; Cahay, René ULg; Momigny, Jacques et al

in Bulletin de l'Académie Royale des Sciences, des Lettres et des Beaux-Arts de Belgique. Sciences (1972), LVIII(7), 821-840

The UV absorption spectra of the charge transfer (CT) complexes formed by iodine with C2H2NH, C2H2O and C2H2S were studied in order to interprete the first ionization potential of these organic molecules ... [more ▼]

The UV absorption spectra of the charge transfer (CT) complexes formed by iodine with C2H2NH, C2H2O and C2H2S were studied in order to interprete the first ionization potential of these organic molecules by using the empirical relationships hn(CT/Max)=f(ID). Taking into account the basical specificity of these relations, the trend of the CT data shows C2H2NH and C2H2O to be n-donors towards iodine and the first ionization potential of the same donors could be ascribed to the removal of an electron from a non-bonding orbital localized on the heteroatom. Theoretical calculations however do not support this interpretation in the case of C2H2NH. [less ▲]

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See detailMass Spectrometric Study of Dissociative Electron Attachment in Carbon Dioxide.
Locht, Robert ULg; Momigny, Jacques

in Bulletin de la Société Royale des Sciences de Liège (1971), 40(9/10), 518-523

The DA efficiency curve of O- in CO2 has been studied mass spectrometricaly. Combining the use of the convolution of theoretical models and the deconvolution of the experimental curves, beside the ... [more ▼]

The DA efficiency curve of O- in CO2 has been studied mass spectrometricaly. Combining the use of the convolution of theoretical models and the deconvolution of the experimental curves, beside the previously reported DA peaks, some new DA processes have been determined at (6.0+/-0.3) eV and (13.3+/-0.4) eV for O- in CO2. A progressive conversion of electronic into vibrational excitation of diatomic radicals and into kinetic energy of the fragments is postulated as responsible for the threshold at (6.0+/-0.3) eV. [less ▲]

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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 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 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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