“…Ion-molecule reactions have been studied in various types of discharges (527,561,1320,1344)• Ion-molecule clusters have been observed in ion-solvent interaction studies in several systems (741, 847, 849,852) and are compared with -particle mass spectrometric results (847). Concurrent ionmolecule reactions of HC1 and HCN with D2 and CD4 have been studied (668). Photoionization mass spectrometers have been employed in investigations of some ion-molecule reactions (921,922,(1543)(1544)(1545).…”