Tomography of Feshbach Resonance States

Abstract

Feshbach resonances are fundamental to interparticle interactions and become particularly important in cold collisions with atoms, ions, and molecules. Here we present the detection of Feshbach resonances in a benchmark system for strongly interacting and highly anisotropic collisions -- molecular hydrogen ions colliding with noble gas atoms. The collisions are launched by cold Penning ionization exclusively populating Feshbach resonances that span both short- and long-range parts of the interaction potential. We resolved all final molecular channels in a tomographic manner using ion-electron coincidence detection. We demonstrate the non-statistical nature of the final state distribution. By performing quantum scattering calculations on ab initio potential energy surfaces, we show that the isolation of the Feshbach resonance pathways reveals their distinctive fingerprints in the collision outcome.

References in corpus (8)

• A High Phase-Space-Density Gas of Polar Molecules
• Observation of Quantum Effects in sub Kelvin Cold Reactions
• Observation of Feshbach resonances between a single ion and ultracold atoms
• Precision test of statistical dynamics with state-to-state ultracold chemistry
• Control of reactive collisions by quantum interference
• A Feshbach resonance in collisions between ultracold ground state molecules
• Field-linked resonances of polar molecules
• Observation of the P-wave Shape Resonance

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• Exploring atom-ion Feshbach resonances below the s-wave limit
• Feshbach Resonances in Cold Collisions: Benchmarking State of the Art ab initio Potential Energy Surfaces
• Electrostatic trapping of N${}_2$ molecules in high Rydberg states
• Floquet-Engineering of Feshbach Resonances in Ultracold Gases
• Quantum suppression of cold reactions far from the s-wave energy limit
• Chemistry in a Cryogenic Buffer Gas Cell
• Rigorous quantum calculations for atom-molecule chemical reactions in electric fields: from single to multiple partial wave regimes
• A quadratic-scaling algorithm with guaranteed convergence for quantum coupled-channel calculations