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Electron impact ionization of thymine clusters embedded in superfluid helium droplets
2007,
- HENALLUX
,
- Article scientifique
Article scientifique
Embedding molecules in helium clusters has become a powerful technique for the preparation of cold targets for spectroscopy experiments, as well as for the assembly of complex, fragile molecular species. We have recently developed a helium cluster source and a pick-up cell to produce neutral beams of doped helium droplets, to be used as targets in studies on electron collisions with molecules of ...
Spectroscopy and dynamics of the 7,7,8,8-tetracyanoquinodimethaneradical anion
2010,
- HENALLUX
,
- Article scientifique
Article scientifique
The photoelectron spectrum of the 7,7,8,8-tetracyanoquinodimethane (TCNQ) radical anion has
been measured at 3.1 eV. Additionally, the ultrafast relaxation dynamics of the first excited state
(12B3u) of TCNQ have been studied using time-resolved photoelectron spectroscopy, which
reveals that it undergoes internal conversion back to the ground state (2B2g) with an associated
lifetime of 650 fs ...
Toward real-time charged-particle image reconstruction using polar onion-peeling
2009,
- HENALLUX
,
- Article scientifique
Article scientifique
A method to reconstruct full three-dimensional photofragment distributions from their two-dimensional (2D) projection onto a detection plane is presented, for processes in which the expanding Newton sphere has cylindrical symmetry around an axis parallel to the projection plane. The method is based on: (1) onion-peeling in polar coordinates [Zhao et al., Rev. Sci. Instrum. 73, 3044 (2002)] in which ...
Electron-impact dissociative ionization of the molecular ion HDO + : A global view
2014,
- HENALLUX
,
- Article scientifique
Article scientifique
We present a combined experimental and theoretical study of the fragmentation of HDO2+ molecular ions
produced by electron-impact ionization of HDO+ in the collision energy range 20–2500 eV. Experimental
absolute partial inclusive cross sections for the production of OD+, OH+, and O+ are reported and compared
successfully to theoretical predictions. Ab initio methods are used to calculate the ...
Electron-impact dissociation and ionization of NH+: formation of N+ and N2+
2010,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron-impact dissociation and ionization of NH+ leading to the formation of N+ and N2+ products have been measured by applying the animated electron–ion beam method, in the energy range from the respective thresholds up to 2.5 keV. The maximum total cross sections are observed to be (15.7 ± 0.7) × 10−17 cm2 and (11.1 ± 0.2) × 10−18 cm2 for N+ and N2+, respectively. ...
Differential and total cross sections of mutual neutralization in low-energy collisions of isotopes of H + + H −
2016,
- HENALLUX
,
- Article scientifique
Article scientifique
Mutual neutralization in the collisions of H+ and H− is studied both theoretically and experimentally. The
quantum-mechanical ab initio model includes covalent states associated with the H(1)+H(n 3) limits and
the collision energy ranges from 1 meV to 100 eV. The reaction is theoretically studied for collisions between
different isotopes of the hydrogen ions. From the partial wave scattering ...
Dissociative excitation of NeD+
2009,
- HENALLUX
,
- Article scientifique
Article scientifique
Measurements of NeD+ dissociative excitation cross section were obtained in Louvain-la-Neuve (UCL, Belgium) by using the animated crossed electron-ion beam method. The electronic structure of the system was calculated by using quantum chemistry calculations for the NeD+ ion and ab initio electron scattering calculations using the complex Kohn variational method for the resonant NeD neutral complex ...
Absolute cross sections and kinetic energy release distributions for electron-impact dissociative excitation and ionization of NeD+
2008,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact dissociative excitation and ionization of NeD+ leading to the formation of singly and multiply charged products (D+, Ne+, Ne2+ and Ne3+) are reported, in the energy range from their respective thresholds to 2.5 keV. The animated crossed-beams method is used. For singly charged fragments, absolute cross sections are obtained separately for dissociative ...
Electron-impact ionization of singly-charged neon ions
2008,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron-impact single and multiple ionization of Ne+ leading to the formation of Neq+ (q = 2–5) are reported. The animated crossed beams method is applied in the energy range from the respective thresholds up to 2.5 keV. The maximum cross sections are found to be (4.12 ± 0.21) × 10−17 cm2, (1.42 ± 0.07) × 1018 cm2, (2.57 ± 0.14) × 10−20 cm2, (8.78 ± 0.54) × 10−22 cm2 for ...
Electron impact dissociation of ND+: formation of D+
2011,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact dissociation of ND+ leading to the formation of D+ have been measured by applying the animated electron-ion beam method in the energy range from the reaction threshold up to 2.5 keV. The maximum inclusive cross section is observed to be (16.8 ± 0.8) × 10−17 cm2 at the electron energy of 65.1 eV. The appearance energy for the D+ production is measured to ...