Dissociative photoionization studies of ethyl iodide using synchrotron radiation photoionization mass spectrometry and photoelectron imaging.

[Display omitted] • The photoionization of C 2 H 5 I under light field were studied by SR-PIMS and PEI. • The stepwise dissociation of C 2 H 5 I under synchrotron radiation was studied. • The dissociation pathway was determined according to experiments and calculation. The stepwise dissociative photoionization of ethyl iodide(C 2 H 5 I) has been investigated via synchrotron radiation photoionization mass spectrometry and photoelectron imaging spectroscopy. By using VUV synchrotron radiation as excitation source, the photoionization and stepwise dissociative photoionization of C 2 H 5 I were observed by tuning the photon energy from 8.5 to 14.0 eV. The ionization energy of C 2 H 5 I was measured to be 9.33 ± 0.05 eV, and the appearance energies of C 2 H 5 +, C 2 H 4 +, C 2 H 3 + were also determined according to the photoionization efficiency spectra. The possible pathways of the stepwise dissociation of C 2 H 5 I were determined by combining the experiments with theoretical calculation based on DFT. Finally, the multi-photon ionization process of C 2 H 5 I molecule was further studied via intensity-dependent photoelectron imaging spectroscopy. [ABSTRACT FROM AUTHOR]