Raphaël Hahn
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View article: Competition between electron transfer and reactive capture in ion–molecule reactions at low collision energies: isotopic and stereodynamic effects in the reactions of CH<sub>3</sub>F with H<sub>2</sub><sup>+</sup>, HD<sup>+</sup> and D<sub>2</sub><sup>+</sup>
Competition between electron transfer and reactive capture in ion–molecule reactions at low collision energies: isotopic and stereodynamic effects in the reactions of CH<sub>3</sub>F with H<sub>2</sub><sup>+</sup>, HD<sup>+</sup> and D<sub>2</sub><sup>+</sup> Open
The bimolecular reactions between CH 3 F and H 2 + , HD + and D 2 + have been studied in the range of collision energies between ∼0 and k B × 30 K using a merged-beam approach.
View article: High repetition rate sub-ns electron pulses from pulsed-resonance Rydberg field-ionization (PRRFI)
High repetition rate sub-ns electron pulses from pulsed-resonance Rydberg field-ionization (PRRFI) Open
View article: Opposite Effects of the Rotational and Translational Energy on the Rates of Ion-Molecule Reactions near 0 K: The <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">D</mml:mi></mml:mrow><mml:mn>2</mml:mn><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup><mml:mo>+</mml:mo><mml:msub><mml:mrow><mml:mi>NH</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow><mml:mi mathvariant="normal">D</mml:mi></mml:mrow><mml:mn>2</mml:mn><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msubsup><mml:mo>+</mml:mo><mml:msub><mml:mrow><mml:mi>ND</mml:mi></mml:mrow><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math> Reactions
Opposite Effects of the Rotational and Translational Energy on the Rates of Ion-Molecule Reactions near 0 K: The and Reactions Open
The ion-molecule reactions D2++NH3 and D2++ND3 are studied at low collision energies (Ecoll from zero to approximately kB×50 K), with the D2+ ions in the ground rovibrational state and for different rotational temperatures of the ammonia …
View article: Opposite Effects of the Rotational and Translational Energy on the Rates of Ion-Molecule Reactions near 0 K: The ${\mathrm{D}}_{2}^{+}+{\mathrm{NH}}_{3}$ and ${\mathrm{D}}_{2}^{+}+{\mathrm{ND}}_{3}$ Reactions
Opposite Effects of the Rotational and Translational Energy on the Rates of Ion-Molecule Reactions near 0 K: The ${\mathrm{D}}_{2}^{+}+{\mathrm{NH}}_{3}$ and ${\mathrm{D}}_{2}^{+}+{\mathrm{ND}}_{3}$ Reactions Open
The ion-molecule reactions $\text{D}_2^++\text{NH}_3$ and $\text{D}_2^++\text{ND}_3$ are studied at low collision energies ($E_{\text{coll}}$ from zero to $\sim k_\textrm{B}\cdot 50\,\text{K}$), with the $\text{D}_2^+$ ions in the ground r…
View article: High repetition rate sub ns-electron pulses from Resonant Pulsed Rydberg Field Ionization
High repetition rate sub ns-electron pulses from Resonant Pulsed Rydberg Field Ionization Open
Using Resonant Pulsed Rydberg Field-ionization (RPRFI) technique, we generate low-energy electron bunches at high repetition rates. By combining continuous-wave laser excitation with a pulsed electric field, this method selectively ionizes…
View article: Observation of quantum capture in an ion-molecule reaction
Observation of quantum capture in an ion-molecule reaction Open
In 1954, Vogt and Wannier (Phys. Rev. 95, 1190) predicted that the capture rate of a polarizable neutral atom or molecule by an ion should increase by a factor of two compared to the classical Langevin rate as the collision energy approach…
View article: Observation of quantum capture in an ion-molecule reaction
Observation of quantum capture in an ion-molecule reaction Open
In 1954, Vogt and Wannier (Phys. Rev. 95, 1190) predicted that the capture rate of a polarizable neutral atom or molecule by an ion should increase by a factor of two compared to the classical Langevin rate as the collision energy approach…
View article: Comparative analysis of recirculating and collimating cesium ovens
Comparative analysis of recirculating and collimating cesium ovens Open
We have performed a study of several cesium oven designs. A comparison between recirculating (or sticking-wall) and collimating (or re-emitting-wall) ovens is made in order to extract the most efficient design in terms of beam brightness. …
View article: Cesium Rydberg-state ionization study by three-dimensional ion-electron correlation: Toward a monochromatic electron source
Cesium Rydberg-state ionization study by three-dimensional ion-electron correlation: Toward a monochromatic electron source Open
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View article: Ionisation of caesium Rydberg atoms for a mono-chromatic electron source for applications in electron microscopy and spectroscopy
Ionisation of caesium Rydberg atoms for a mono-chromatic electron source for applications in electron microscopy and spectroscopy Open
Les sources d’électrons utilisées en microscopie électronique ont une haute brillance mais une haute dispersion en énergie (>250 meV). D’autres types de sources existent, basées sur la photo ionisation de jets atomiques, remarquables par l…
View article: Cesium Rydberg states ionization study by 3-D ion-electron correlation
Cesium Rydberg states ionization study by 3-D ion-electron correlation Open
We study the excitation and ionization of cesium Rydberg states in an electric field (∼ 2200 V/cm) near the classical field ionization threshold (∼ −280 cm −1 binding energy at this field) by 3-D ionelectron coincidence spectroscopy. Cesiu…
View article: Narrow-band pulsed electron source based on near-threshold photoionization of Cs in a magneto-optical trap
Narrow-band pulsed electron source based on near-threshold photoionization of Cs in a magneto-optical trap Open
The newly developed method of time-of-flight (ToF) momentum microscopy was\nused to analyse the cold electron emission from a Cs 3D magneto-optical trap\n(MOT). Three-step resonant photoionization was implemented via two intermediate\nstat…
View article: Design for a high resolution electron energy loss microscope
Design for a high resolution electron energy loss microscope Open