Publications by authors named "Nathalie de Ruette"
Article Synopsis
- Negative ions play a crucial role in various scientific fields such as interstellar chemistry and anti-matter research, where their unique properties are influenced by electron-correlation effects.
- Traditional methods for studying these ions face challenges due to their loosely bound nature and limited optical transitions, hindering high-resolution detection techniques.
- A new method has been developed that accurately measures negative ion binding energies with significantly higher precision, utilizing laser manipulation and a cryogenic ion-beam storage ring, leading to a reported electron affinity of 1.461 112 972(87) eV for oxygen.
We report absolute integral cross section (ICS) measurements using a dual-source merged-fast-beams apparatus to study the titular reactions over the relative translational energy range of Er ∼ 0.01-10 eV. We used photodetachment of C- to produce a pure beam of atomic C in the ground electronic 3P term, with statistically populated fine-structure levels.
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- Researchers at Stockholm University's DESIREE facility measured the cooling lifetimes and detachment energies for three sizes of carbon anions (C3, C4, and C5) in a super-cool environment with low pressure.
- They created two-dimensional photodetachment spectra that showed how the anions lost energy over time, revealing cooling lifetimes of 3.1 s, 6.8 s, and 24 s for each respective anion size.
- The study's findings confirmed the occurrence of radiative cooling and established a model for simulating cooling dynamics, which could be useful for exploring other molecular anions in future research.
We have studied collisions between tetraphenylporphyrin cations and He or Ne at center-of-mass energies in the range 50-110 eV. The experimental results were interpreted in view of density functional theory calculations of dissociation energies and classical molecular dynamics simulations of how the molecules respond to the He/Ne impact. We demonstrate that prompt atom knockout strongly contributes to the total destruction cross sections.
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