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An intriguing phenomenon in molecular collisions is the occurrence ofscattering resonances, which originate from bound and quasi-bound statessupported by the interaction potential at low collision energies. The resonanceeffects in the scattering behaviour are extraordinarily sensitive to theinteraction potential, and their observation provides one of the most stringenttests for theoretical models. We present high-resolution measurements ofstate-resolved angular scattering distributions for inelastic collisionsbetween Zeeman-decelerated C($^3P_1$) atoms and $\textit{para}$-H$_2$ moleculesat collision energies ranging from 77 cm$^{-1}$ down to 0.5 cm$^{-1}$. Rapidvariations in the angular distributions were observed that can be attributed tothe consecutive reduction of contributing partial waves and effects ofscattering resonances. The measurements showed excellent agreement withdistributions predicted by $\textit{ab initio}$ quantum scatteringcalculations. However, discrepancies were found at specific collision energies,which most likely originate from an incorrectly predicted quasi-bound state.These observations provide exciting prospects for further high-precision andlow-energy investigations of scattering processes that involve paramagneticspecies.

Imaging Resonance Effects in C + H$_2$ Collisions using a Zeeman Decelerator