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Electron-impact ionization of atomic hydrogen: dynamical variational treatment
2011,
- HENALLUX
,
- Article scientifique
Article scientifique
A simple and straightforward calculating scheme is proposed for electron-impact single and multiple ionization of atoms. The method is based on the application of the Hulthén-Kohn dynamical variational principle. An effective charge seen by the scattered electron is determined for a certain type of trial wave functions mathematically in a rigorous way excluding any empirical assumptions. Validity ...
Energy distributions of H+ fragments ejected by fast proton and electron projectiles in collision with H2O molecules
2009,
- HENALLUX
,
- Article scientifique
Article scientifique
Experimental measurements of the kinetic energy distribution spectra of
H
+
fragment ions released during radiolysis of water molecules in collision with 20, 50, and 100 keV proton projectiles and 35, 200, 400, and 1000 eV electron projectiles are reported using a pulsed beam and drift tube time-of-flight based velocity measuring technique. The spectra show that
H
+
fragments carrying a ...
CRP on Atomic and Molecular Data for Plasma Modelling Volume 16
2014,
- HENALLUX
,
- Article scientifique
Article scientifique
This publication, arising from a Coordinated Research Project on Atomic and Molecular Data for Plasma Modelling, provides information on new data relevant to the edge region of plasmas in nuclear fusion energy devices. In this region, molecules and molecular ions are formed and react with electrons and with each other and fusion plasma modelling requires cross-sections and rate coefficients for such ...
Absolute cross-sections and kinetic energy release distributions for electron-impact dissociation of D3+
2009,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross-sections for electron-impact dissociation of D+3 leading to the formation of D+ and D+2 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 (13.9 ± 1.1) × 10−17 cm2 and (8.2 ± 0.1) × 10−17 cm2 (around 50 eV) for D+ and for D+2 fragments, ...
Isotope effects in electron-impact dissociation of D2H+
2011,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections have been measured using the crossed electron–ion beams method for electron-impact dissociation of the D2H+ molecular ion yielding H+, D+, HD+ and D+2 fragments. The collision energy ranges from a few eV up to 2.5 keV. Around the maximum, cross sections are found to be of a similar amplitude: (3.25 ± 0.08) × 10−17 cm2 for H+, (3.56 ± 0.15) × 10−17 cm2 for HD+ and (3.33 ± 0.11) ...
Rotational dependence of the dipole moment of 13CH3F
2004,
- HENALLUX
,
- Article scientifique
Article scientifique
When a gas sample of 13CH3F is prepared with a population of spin isomers far from the equilibrium given by nuclear spin statistics, it relaxes towards this equilibrium with an exponential decay rate. This rate is increased by submitting the molecules to a static electric field, emphasizing the role of the magnetic intramolecular interactions and of the collisions in the “quantum relaxation” process ...
Absolute cross sections and kinetic energy release for doubly and triply charged fragments produced by electron impact on CO+
2006,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact ionization of CO+ leading to the formation of doubly and triply charged products (CO2+, C2+ and O2+, C3+ and O3+) are reported in the energy range from their respective thresholds to 2500 eV. Around the maximum, cross section values are found to be (13.36 ± 0.56) × 10−18 cm2, (5.58 ± 0.55) × 10−18 cm2 and (1.37 ± 0.14) × 10−18 cm2 for CO2+, C2+ and O2+, ...
Electron impact multiple ionization of C+ and N+ and O+ ions
2014,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron impact single and multiple ionization of C+, N+ and O+ ions leading to the formation of Cq+ (q=2-4), Nq+ (q=2-5) and Oq+ (q=2-5) are reported in the energy range extending from the respective thresholds up to 2.5 keV. The general feature of the measured cross sections is investigated.
A crossed-beam experiment for electron impact ionization and dissociation of molecular ions: its application to CO+
2006,
- HENALLUX
,
- Article scientifique
Article scientifique
A crossed electron–ion beam experimental set-up has been upgraded for the study of electron impact ionization and dissociation of molecular ions by means of ionic product detection. Both the experimental set-up and the data analysis procedures are described in detail for the estimation of (i) absolute cross sections, (ii) kinetic energy release distributions (KERD) and (iii) anisotropies of angular ...
Absolute cross sections and kinetic energy release distributions for electron-impact ionization and dissociation of CD+ 4
2008,
- HENALLUX
,
- Article scientifique
Article scientifique
Absolute cross sections for electron-impact dissociative excitation and ionization of CD+ 4 leading to formation of ionic products (CD2+ 4, CD+ 3, CD+ 2, CD+, C+, D+ 3, D+ 2, and D+) have been measured. The animated crossed-beams method is applied in the energy range from the reaction threshold up to 2.5 keV. Around 100 eV, the maximum cross sections are found to be (3.8±0.2) ×10-19 cm2, (10.8±1.5)× ...