Electron-induced vibrational excitation and dissociative electron attachment in methyl formate
We probe the low-energy electron collisions with methyl formate HCOOCH$_3$, focusing on its resonant states. Experimentally, we (i) use the two-dimensional electron energy loss spectroscopy to gain the information about the vibrational excitation and (ii) report the absolute dissociative electron attachment cross sections. The electron scattering spectra reveal both the threshold effects due to the long-range electron-molecule interaction and a pronounced $\pi^*$ resonance centered around 2.1 eV. This resonance gives rise to dissociative electron attachment into three different anionic channels, the strongest one being the production of the formate anion. Theoretically, we characterize this resonant state using the complex adsorbing potential approach combined with multistate multireference perturbation theory, which predicts its position and width in an excellent agreement with the experiment.