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Abstract=A05-m1d

For the inelastic-collision processes M + X2 M+ + (X + X-) [Positioning (link type: `elaborated in/info'; target: A05-m2)], where the transition to the ionic state takes place via pseudo-crossing of the neutral and ionic ground states, the relative differential cross section has been measured using molecular beam techniques [Experimental methods (link type: `INFO/detailed in/focused on in'; target: A05-m3a)] at a kinetic energy of the colliding particles in the eV range. Results [Results (link type: ` INFO/detailed in/focused on in'; target: A05-m4)] are shown for the systems K + Br2, K + I2 and Li + Br2. The measurements on K + Br2 are compared [Interpretation (link type: ` INFO/detailed in/focused on in'; target: A05-m5)] with calculations based on a simple classical model [Theoretical methods (link type: ` INFO/detailed in/focused on in'; target: A05-m3c)] using the impact-parameter approximation, an isotropic intermolecular potential and neglecting the internal states of the X2 molecule. These measurements seem to be suitable for the determination of potential parameters, crossing distance and resonance energy at the crossing point [Interpretation (link type: `INFO/detailed in/focused on in'; target: A05-m5bi)]. The classically calculated differential cross sections [Details on the calculation are given in an Interpretation module (link type: `INFO/detailed in/focused on in'; target: A05-m5bii)] are only in qualitative agreement with the measurements [Outcome (link type: `INFO/detailed in/focused on in'; target: A05-m6)].