Abstract
We report the first observation of ion recoil induced by the ionization process for a molecule. The applicability of the method has been demonstrated by determining the β 2 and β 4 anisotropy parameters of the angular distributions of NO + ions in the resonance-enhanced two-photon ionization of NO(X 2 Π 1/2 , v=0, J) via the A 2 Σ + ( v *=0, N *) state at 226 nm. An energy resolution in the range of 10 μeV is demonstrated. The method might prove to be particularly useful for studying complex ionization-fragmentation processes as they occur for example for superexcited molecules.
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