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An electron spectrometric study has been performed on HC1 using metastable helium and neon atoms as well as neon resonance photons. High resolution electron spectra were obtained with two different beam apparatuses for a mixed He(2 ~S, 23S) beam, a pure He(23S) beam, and, for the first time, state-selected pure Ne(3s3P2) and pure Ne(3s3P0) beams, and for NeI resonance photons. For the system He(23S)+HC1 the vibrational populations P(v') of the formed HCI+(X2//i, v') and HCI+(A 2L'+, v') ions are found to differ from the Franck-Condon factors for unperturbed potentials, indicating slight bond stretching in HC1 upon He(2 3S) approach. For He(21S) + HC1 the vibrational peak shapes and vibrational populations are substantially different from the He(2aS) case, pointing to an additional, charge exchanged interaction (He ÷ +HC1-) in the entrance channel of the former system. For the first time, we have detected the electrons in both the He(21S) + HC1 and He(2 3S) + HC1 spectra associated with the major mechanism for the formation of C1 ÷ ions: energy transfer to repulsive HCI** Rydberg states, dissociating to H(1 s) and autoionizing Ct**(1D2 n/) atoms. For both Ne (3P2)+ HC1 and Ne(3Po)+HC1, the populations P(v') of both final molecular states HCI+(X, A) agree closely with the Franck-Condon factors at the average relative collision energy E~oll = 55 meV and, for HCt + (A 2S+), also at E~o n = 130 meV.

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