Publications of Françoise Motte-Tollet
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See detailElectronic excitation and oscillator strength of ethyl bromide by vacuum ultraviolet photoabsorption and electron energy loss spectroscopy
Giuliani, Alexandre; Tollet, Françoise ULiege; Delwiche, Jacques ULiege et al

in Journal of Chemical Physics (2000), 112(14), 6285-6292

The high resolution vacuum ultraviolet photoabsorption spectrum of ethyl bromide has been recorded between 5 and 10.15 eV (248-122 nm) using synchrotron radiation. It exhibits a broad structureless ... [more ▼]

The high resolution vacuum ultraviolet photoabsorption spectrum of ethyl bromide has been recorded between 5 and 10.15 eV (248-122 nm) using synchrotron radiation. It exhibits a broad structureless valence band centred at 6.1 eV of low cross section followed by a region dominated by excitation of Rydberg states. A high resolution photoelectron spectrum (PES) of the lowest energy ionization band has been obtained and provides ionization energies necessary for identification of related Rydberg-excited states. Also, analysis of the vibrational fine structure in the PES has allowed identification of the normal vibrational modes excited and their wave numbers in the ion. These data, in turn, have been used in the assignment of the lowest energy photoabsorption bands arising from electron excitation into the 5s Rydberg orbital. The electron energy loss spectrum, recorded from 6.5 to 14.1 eV, under electric-dipole conditions, confirms the magnitude of the photoabsorption cross-section values obtained using the synchrotron radiation and extends the differential and optical oscillator strength values up to 14.004 eV. © 2000 American Institute of Physics. [less ▲]

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See detailElectronic excitation and oscillator strength of ethyl iodide by VUV photoabsorption and electron energy loss spectroscopy
Giuliani, Alexandre; Tollet, Françoise ULiege; Delwiche, Jacques ULiege et al

in Journal of Chemical Physics (1999), 110(21), 10307-10315

A high resolution VUV photoabsorption spectrum of ethyl iodide has been recorded between 4 and 10.2 eV (310-120 nm) using synchrotron radiation. The spectrum consists of a broad structureless absorption ... [more ▼]

A high resolution VUV photoabsorption spectrum of ethyl iodide has been recorded between 4 and 10.2 eV (310-120 nm) using synchrotron radiation. The spectrum consists of a broad structureless absorption band centered at 4.78 eV, followed by a region dominated by excitation of Rydberg states. A high resolution photoelectron spectrum (PES) of the lowest energy ionization band has been obtained and provides ionization energies necessary for identification of related Rydberg-excited states. Also, analysis of the vibrational fine structure in the PES has allowed identification of the normal vibrational modes excited and their wave numbers in the ion. These, in turn, have been used in the assignment of the lowest energy photoabsorption bands arising from electron excitation into the 6s Rydberg orbital. An electron energy loss spectrum has also been recorded from 5.8 to 14.2 eV, under electric-dipole conditions. It confirms the magnitude of the photoabsorption cross section values obtained using the synchrotron radiation and extends the differential and optical oscillator strength values up to 14.2 eV. © 1999 American Institute of Physics. [less ▲]

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See detailOn the high-resolution HeI photoelectron spectrum of Cl2O
Tollet, Françoise ULiege; Delwiche, Jacques ULiege; Heinesch, Jacques ULiege et al

in Chemical Physics Letters (1998), 284(5-6), 452-458

The high-resolution HeI (58.4 nm) photoelectron spectrum of dichlorine monoxide, Cl2O, has been recorded in the region of the four lowest-energy ionic electronic states. Formation of the ion in its ground ... [more ▼]

The high-resolution HeI (58.4 nm) photoelectron spectrum of dichlorine monoxide, Cl2O, has been recorded in the region of the four lowest-energy ionic electronic states. Formation of the ion in its ground and excited electronic states is accompanied in each case by vibrational excitation. In particular, the vibrational structure of the first and second excited states of Cl2O+ is resolved. Analysis of the vibrational progressions associated with formation of the various ionic states has been completed, allowing confirmation of the symmetry and bonding characteristics of the four highest-energy occupied molecular orbitals of Cl2O. [less ▲]

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See detailVibrational excitation of methylamine by electron impact in the 4.5-30 eV energy range
Tollet, Françoise ULiege; Hubin-Franskin, Marie-Jeanne ULiege; Collin, Jacques ULiege

in Journal of Chemical Physics (1992), 97(10), 7314-7322

Vibrational excitation of gaseous methylamine induced by 4.5-30 eV energy electrons has been investigated by the electron energy loss spectroscopy. The ratios of the differential cross sections for ... [more ▼]

Vibrational excitation of gaseous methylamine induced by 4.5-30 eV energy electrons has been investigated by the electron energy loss spectroscopy. The ratios of the differential cross sections for excitation of the vibrational modes and for elastic scattering measured as a function of the electron kinetic energies show that at 15 and 30 eV, the vibrational excitation occurs mainly through a direct mechanism. The absolute vibrationally elastic and inelastic differential cross sections have been measured at these impact energies. The cross sections for the inelastic scattering are strongly dependent on the vibrational mode which is excited. © 1992 American Institute of Physics. [less ▲]

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See detailResonant vibrational excitation of methylamine by low energy electron impact
Tollet, Françoise ULiege; Hubin-Franskin, Marie-Jeanne ULiege; Collin, Jacques ULiege

in Journal of Chemical Physics (1990), 93(11), 7843-7850

The study of the excitation functions of the NH2 and CH 3 stretching modes of methylamine in the 4-12 eV electron impact energy range shows evidence of a broad shape resonance built on the electronic ... [more ▼]

The study of the excitation functions of the NH2 and CH 3 stretching modes of methylamine in the 4-12 eV electron impact energy range shows evidence of a broad shape resonance built on the electronic ground state and centered at 7.5 eV. This resonance is formed by the trapping of the incident electron in the second unoccupied molecular orbital and is of A " symmetry. The elastic and inelastic angular differential cross sections measured in the 10°-90° range suggest a dominant p character. A second shape resonance located at higher energy contributes mainly to the enhancement of the CH3 deformation modes and is very likely of A ' symmetry. A comparison is made between the resonances observed in NH3 and CH 3 NH2. The effect of the methyl substitution is briefly discussed. © 1990 American Institute of Physics. [less ▲]

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