Photoionization and threshold photoelectron—photoion coincidence study of cyclopropene from onset to 20 eV

The photoionization efficiency curves have been obtained for cyclopropene and its fragments C3H+3, C3H+2, and C3H+ from threshold to 20 eV. The threshold photoelectron spectra and breakdown curves are given over the same energy range. The breakdown curve is almost identical to those obtained previously for allene and propyne when put on a common energy scale. This suggests that all three ions isomerize to a common structure before fragmentation.