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Scattering resonances play a central role in collision processes in physicsand chemistry. They help building an intuitive understanding of the collisiondynamics due to the spatial localization of the scattering wavefunctions. Forresonances that are localized in the reaction region, located at shortseparation behind the centrifugal barrier, sharp peaks in the reaction ratesare the characteristic signature, observed recently with state-of-the-artexperiments in low energy collisions. If, however, the localization occursoutside of the reaction region, mostly the elastic scattering is modified. Thismay occur due to above barrier resonances, the quantum analogue of classicalorbiting. By probing both elastic and inelastic scattering of metastable heliumwith deuterium molecules in merged beam experiments, we differentiate betweenthe nature of quantum resonances -- tunneling vs above barrier -- andcorroborate our findings by calculating the corresponding scatteringwavefunctions.

Determining the nature of quantum resonances by probing elastic and reactive scattering in cold collisions