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Observation of molecular dynamics with quantum state resolution is one of themajor challenges in chemical physics. Complete characterization of collisiondynamics leads to the microscopic understanding and unraveling of differentquantum phenomena such as scattering resonances. We present a new experimentalapproach for observing molecular dynamics involving neutral particles and ionsthat is capable in providing state-to-state mapping of the dynamics. We usePenning ionization reaction between argon and metastable helium to generateargon ion and ground state helium atom pairs at separation of severalangstroms. The energy of ejected electron carries the information about theinitial electronic state of an ion. The coincidence detection of ionic productsprovides a state resolved description of the post-ionization ion-neutraldynamics. We demonstrate that correlation between the electron and ion energyspectra enables us to directly observe the spin-orbit excited Feshbachresonance state of HeAr$^+$. We measure the lifetime of the quasi-boundHeAr$^+$ A$_2$ state and discuss possible applications of our method.

Direct Observation of a Feshbach-resonance by Coincidence-detection of Ions and Electrons in Penning Ionization Collisions