Fragmentation and Ion Desorption from Condensed Pyrimidine by Electron Impact: Implications for Cometary and Interstellar Heterocyclic Chemistry

摘要: The desorption process induced by photons, electrons, or ions onto icy surfaces is an important mechanism for leading neutral ionized molecular species to the gas phase in interstellar and circumstellar environments. In this work, we report results of high energy electron impact a condensed pyrimidine ice means electron-stimulated ion (ESID). Desorbed cations from surface were analyzed time-of-flight mass spectrometry (TOF-MS). most abundant desorbed are H+ H2+, although several other fragments, such as C2H2+, HCN+, C3H3+, CHN2+, C2H2N2H+, C4H4N2H+, have also been identified. fragmentation pattern was found be characterized six distinct regions on its spectra, containing ionic fragments bearing one members original ring. Five-membered fragment observed first time experiments. Absolute values yield determined. ...