Electron stimulated desorption of cations from C6H6 and C6H12 molecules adsorbed on Pt() and Ar spacer layer

Desorption of cluster ions from adsorbed methane under cryogenic condition by low-energy ion irradiation

“…This is followed by Auger decay, and fragment ions (in the present case, monomer ions) are desorbed due to the Coulomb repulsion [14,15]. It is also reported that cluster ion desorbs from frozen molecules by Coulomb repulsion [16,17]. On the other hand, ion beam loses its kinetic energy through not only electronic excitation but also nuclear collision.…”

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

“…It is noteworthy that the same comparison is valid for previous gas-phase experiments, with either photons − or electron impact. ,, The reason for this is the influence of C–H···N intermolecular forces on the pyrimidine ice during fragmentation, which allows a number of rearrangements before desorption occurs. The role of intermolecular forces during ESID has been previously studied for condensed hydrogen-bonded molecules, − suggesting that strong ion–dipole interactions may favor proton-transfer reactions, rather than simple molecular dissociation.…”

Electron stimulated desorption from condensed benzene

“…Significant differences are observed between the condensed and the gas-phase results, indicating that different fragmentation processes and/or post-dissociation interactions occur in each phase. 40,57 Most of the cationic species formed in the gas-phase are observed in the condensed-phase but with differences in their associated relative intensities. The parent cation is found to be the most intense in the gas-phase, while in the condensed-phase, it is the lightest fragment cation, H + .…”

“…Therefore, in order to get more conclusive results, further investigations of these specific metal effects will have to be performed by comparing similar measurements for benzene films with a rare gas-solid (RGS) buffer layer as discussed before for other molecules. 40,63,70,71 Anion and cation yield magnitude Despite the similarity of energy dependence, there is a large difference in magnitude between the cation and the anion yields from ESD experiments. For a fixed thickness of 2ML, the ratio of anion to cation yield is E700 at low energies and decreases to E300 for higher energies.…”

“…[25][26][27] Calculations have been performed within the framework of density functional theory (DFT), [28][29][30][31][32][33][34][35] semiempirical atom superposition, electron delocalization molecular orbital (ASED-MO) theory 36,37 and a variety of other ab initio computations to study the interaction of benzene with platinum clusters. 38 The reactivity of platinum cluster ions with benzene has also been experimentally studied by Liu et al 39 A study of ESD yielding cations from physisorbed benzene both directly on a Pt surface and on a 15ML argon spacer layer was performed by Kawanowa et al 40 back in 2003. Although these authors could observe the cation ESD yield from the benzene molecule adsorbed on the argon spacer layer, the low sensitivity of the experimental setup prevented the detection of any other desorbed fragments, apart from H + after benzene deposited directly on the Pt surface.…”