Application of coincidence techniques in molecular beam experiments

Coincidence techniques have been applied to the study of electronic excitation in molecular beam experiments in the eV-range. Two different types of processes have been investigated: (i) For the symmetric rare gas systems Ne-Ne and Ar-Ar total cross sections for simultaneous excitation of the projectile and target atom have been measured from the apparent threshold around 40 eV to about 500 eV. (ii) Differential cross sections for excitation of potassium in the process K(42S) + N2 → K(42P) + N2 have been measured between 100<=tau<=3600 eV.deg for collision energies between 20 and 190 eV. (Auth.)