Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Atomic-matter-wave diffraction evidenced in low-energy Na + +Rb charge-exchange collisions

A. Leredde, A. Cassimi, X. Fléchard, D. Hennecart, H. Jouin, Bernard Pons

Published Mar 21, 2012• 12 citations
Publisher

Abstract

Single charge transfer in low-energy ${\mathrm{Na}}^{+}+{}^{87}\mathrm{Rb}(5s,5p)$ collisions is investigated using magneto-optically trapped Rb atoms and high-resolution recoil-ion momentum spectroscopy. The three-dimensional reconstruction of the recoil-ion momentum provides accurate relative cross sections for the active channels along with their associated distributions in projectile scattering angle. The measurements are accompanied by molecular close-coupling calculations. The predicted diffractionlike oscillations in angular distributions are clearly resolved by the experiment. An excellent agreement is found between the present molecular calculations and the experimental data.

DOI
10.1103/physreva.85.032710

Related papers

Study of low energy ion-atom collisions using a magneto-optical trap

A. Leredde, Patricia Barragán, A. Cassimi +4 more

A magneto-optical trap (MOT) has been coupled to a recoil-ion momentum spectrometer to study the charge exchange process in Na + + 87 Rb collisions in the keV impact energy range. The relative cross sections of the active charge exchange channels and the associated distributions in scattering angle were measured with a high precision. They provide a very detailed test of theoretical calculations.

Journal of Physics Conference Series•Nov 5, 2012•0 citations

Differential charge-transfer cross sections for Na+ with Rb collisions at low energies

Teck-Ghee Lee, H. Nguyen, X. Fléchard +2 more

We report on a theoretical and experimental study of state-selective differential single-electron transfer cross sections between ${\mathrm{Na}}^{+}$ ions and $\mathrm{Rb}(5s,5p)$ atoms at collision energies of 2, 5, and 7 keV. A two-center multichannel semiclassical impact parameter close-coupling method with straight-line trajectories was used to obtain single-electron capture amplitudes. By combining with the eikonal approximation, we calculated the angular differential cross sections. These results are compared to the experimental data obtained with Rb targets cooled in a magnetic optical trap. It is shown that there is generally a good agreement between the present calculations and the experiments. In spite of the higher resolution offered from the cold target, the rapid oscillations in the differential cross sections are not resolved by the experiments.

Physical Review A•Oct 1, 2002•31 citations

Energy-dependent relative charge transfer cross sections of Cs++ Rb(5s, 5p)

Hai Truong Nguyen, R. Brédy, X. Fléchard +1 more

Magneto optical trap recoil ion momentum spectroscopy is used to measure energy-dependent charge exchange cross sections in the Cs+ + Rb(5s, 5p) system over a range of projectile energies from 3.2 to 6.4 keV. The measurements are kinematically complete and yield cross sections that are differential in collision energy, scattering angle, and initial and final states.

arXiv:1306.4112•Journal of Physics B Atomic Molecular and Optical Physics•May 10, 2013•1 citation

Recoil ion momentum spectroscopy using magneto-optically trapped atoms

Hai Truong Nguyen, X. Fléchard, R. Brédy +2 more

A novel apparatus has been developed in which atoms in a magneto-optical trap are used as targets in ion-atom collision experiments. The apparatus is an extension of earlier methodology in which the momentum of the recoiling target is measured and used to deduce the collision Q value and projectile scattering angle. In the present work, the low temperature of the target atoms yields increased momentum resolution, which in turn leads to improved Q value and scattering angle resolution. In addition, because the trapping process leaves some fraction of the atoms in an excited state, the new methodology is ideal for the study of collisions with excited targets. The prototypical system presented is low energy charge transfer between singly charged alkali ions and trapped rubidium atoms in the ground and first excited state.

Review of Scientific Instruments•Jul 28, 2004•24 citations

High-Resolution Probe of Coherence in Low-Energy Charge Exchange Collisions with Oriented Targets

A. Leredde, X. Fléchard, A. Cassimi +2 more

The trapping lasers of a magneto-optical trap have been used to bring Rb atoms into well defined oriented states. Coupled to recoil-ion-momentum spectroscopy, this provided a unique MOTRIMS setup which was able to probe scattering dynamics, including the coherence features, with unprecedented resolution. The technique was applied to the low-energy charge exchange reactions Na+ + Rb(5p±1)→Na(3p,4s)+Rb+. The measurements revealed detailed features of the collisional interaction which were employed to improve the theoretical description. As such, it was possible to ascertain the validity of the intuitive models used to predict the most likely capture transitions.

arXiv:1306.4172•Physical Review Letters•Sep 26, 2013•6 citations

Kinematically Complete Charge Exchange Experiment in the Cs++Rb Collision System Using a MOT Target

X. Fléchard, H. Nguyen, E. Wells +2 more

Charge exchange is examined with unprecedented precision using the newly developed magneto-optical trap-target recoil ion momentum spectroscopy (MOTRIMS) technique. Initial and final state selective, charge exchange cross sections are obtained for 6 keV Cs+ colliding with rubidium in 5s and 5p states. For each charge transfer channel, cross sections differential in scattering angle are measured. These data are used to overturn previous long-standing conjecture as to the origin of oscillations seen in total charge exchange cross section measurements, and compare well with an enhanced Demkov model calculation.

Physical Review Letters•Aug 31, 2001•65 citations
Single charge transfer in low-energy Na++87Rb(5s,5p){\mathrm{Na}}^{+}+{}^{87}\mathrm{Rb}(5s,5p)Na++87Rb(5s,5p) collisions is investigated using magneto-optically trapped Rb atoms and high-resolution recoil-ion momentum spectroscopy. The three-dimensional reconstruction of the recoil-ion momentum provides accurate relative cross sections for the active channels along with their associated distributions in projectile scattering angle. The measurements are accompanied by molecular close-coupling calculations. The predicted diffractionlike oscillations in angular distributions are clearly resolved by the experiment. An excellent agreement is found between the present molecular calculations and the experimental data.
We report on a theoretical and experimental study of state-selective differential single-electron transfer cross sections between Na+{\mathrm{Na}}^{+}Na+ ions and Rb(5s,5p)\mathrm{Rb}(5s,5p)Rb(5s,5p) atoms at collision energies of 2, 5, and 7 keV. A two-center multichannel semiclassical impact parameter close-coupling method with straight-line trajectories was used to obtain single-electron capture amplitudes. By combining with the eikonal approximation, we calculated the angular differential cross sections. These results are compared to the experimental data obtained with Rb targets cooled in a magnetic optical trap. It is shown that there is generally a good agreement between the present calculations and the experiments. In spite of the higher resolution offered from the cold target, the rapid oscillations in the differential cross sections are not resolved by the experiments.
A novel apparatus has been developed in which atoms in a magneto-optical trap are used as targets in ion-atom collision experiments. The apparatus is an extension of earlier methodology in which the momentum of the recoiling target is measured and used to deduce the collision Q value and projectile scattering angle. In the present work, the low temperature of the target atoms yields increased momentum resolution, which in turn leads to improved Q value and scattering angle resolution. In addition, because the trapping process leaves some fraction of the atoms in an excited state, the new methodology is ideal for the study of collisions with excited targets. The prototypical system presented is low energy charge transfer between singly charged alkali ions and trapped rubidium atoms in the ground and first excited state.
The trapping lasers of a magneto-optical trap have been used to bring Rb atoms into well defined oriented states. Coupled to recoil-ion-momentum spectroscopy, this provided a unique MOTRIMS setup which was able to probe scattering dynamics, including the coherence features, with unprecedented resolution. The technique was applied to the low-energy charge exchange reactions Na+ + Rb(5p±1)→Na(3p,4s)+Rb+. The measurements revealed detailed features of the collisional interaction which were employed to improve the theoretical description. As such, it was possible to ascertain the validity of the intuitive models used to predict the most likely capture transitions.
Charge exchange is examined with unprecedented precision using the newly developed magneto-optical trap-target recoil ion momentum spectroscopy (MOTRIMS) technique. Initial and final state selective, charge exchange cross sections are obtained for 6 keV Cs+ colliding with rubidium in 5s and 5p states. For each charge transfer channel, cross sections differential in scattering angle are measured. These data are used to overturn previous long-standing conjecture as to the origin of oscillations seen in total charge exchange cross section measurements, and compare well with an enhanced Demkov model calculation.