Electron attachment to amides studied by low-pressure chemical ionization and electron swarms: comparison of the gas and liquid phase

The low-pressure chemical ionization and electron swarm techniques were used to determine the density effect of the environment in the case of electron attachment to four linear or cyclic, primary or substituted amides: N-methylacetamide, dimethylacetamide, pyrrolidone, and N-methylpyrrolidone. The results are compared with those obtained previously for the same compounds in polar liquid phases, where they have been used either as solutes or as solvating media. From this comparison, the electron attachment scheme proposed for the dense gas phase was extended to the liquid phase.