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Detailed information about scattering amplitudes of inelastic atomic collision processes is obtained by simultaneous detection of a scattered particle and a photon emitted from a scattered particle. Channels of neighbouring excitation energy, which are difficult to distinguish by optical or energy loss spectroscopy, are demonstrated to be separable making use of a difference in radiative lifetimes and of the resulting different response to an external magnetic field. The results are discussed in the framework of a quasimolecular description of the collision pair. For the He++ He system, a complete picture of the process is obtained by modifying models discussed previously. Qualitative conclusions are drawn for the He + + Ne system.

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A new technique for the analysis of molecular targets with respect to the alignment of the axes of the molecules is described. The ionic fragments from the decay of doubly charged ions created by electron impact are detected in coincidence. From the spatial distribution of the coincidence rate the alignment of the molecular axes can be determined. A rather high degree of alignment has been found in molecular beams from multichannel arrays. A simple model for the explanation of this surprising finding is discussed.