TY - JOUR A1 - Abdoul-Carime, Hassan A1 - Bald, Ilko A1 - Illenberger, Eugen A1 - Kopyra, Janina T1 - Selective Synthesis of Ethylene and Acetylene from Dimethyl Sulfide Cold Films Controlled by Slow Electrons JF - The journal of physical chemistry : C, Nanomaterials and interfaces N2 - One of the major challenges in chemical synthesis is to trigger and control a specific reaction route leading to a specific final product, while side products are avoided. Methodologies based on resonant processes at the molecular level, for example, photochemistry, offer the possibility of inducing selective reactions. Electrons at energies below the molecular ionization potential (<10 eV) are known to dissociate molecules via resonant processes with higher cross sections and specificity than photons. Here we show that even subexcitation electrons with energies as low as 1 eV produce ethylene and acetylene from dimethyl sulfide in competing reactions. However, the production of ethylene can specifically be targeted by controlling the energy of electrons (similar to 3 to 4 eV). Finally, pure ethylene is selectively desorbed by heating the substrate from 90 to 105 K. Beyond the synthesis of these versatile hydrocarbons for various industrial applications from a biogenic sulfur compound, our findings demonstrate the feasibility of electron induced selective chemistry applicable on the nanoscale. Y1 - 2018 U6 - https://doi.org/10.1021/acs.jpcc.8b07377 SN - 1932-7447 VL - 122 IS - 42 SP - 24137 EP - 24142 PB - American Chemical Society CY - Washington ER - TY - JOUR A1 - Kopyra, Janina A1 - Wierzbicka, Paulina A1 - Tulwin, Adrian A1 - Thiam, Guillaume A1 - Bald, Ilko A1 - Rabilloud, Franck A1 - Abdoul-Carime, Hassan T1 - Experimental and theoretical studies of dissociative electron attachment to metabolites oxaloacetic and citric acids JF - International Journal of Molecular Sciences (IJMS) N2 - In this contribution the dissociative electron attachment to metabolites found in aerobic organisms, namely oxaloacetic and citric acids, was studied both experimentally by means of a crossed-beam setup and theoretically through density functional theory calculations. Prominent negative ion resonances from both compounds are observed peaking below 0.5 eV resulting in intense formation of fragment anions associated with a decomposition of the carboxyl groups. In addition, resonances at higher energies (3–9 eV) are observed exclusively from the decomposition of the oxaloacetic acid. These fragments are generated with considerably smaller intensities. The striking findings of our calculations indicate the different mechanism by which the near 0 eV electron is trapped by the precursor molecule to form the transitory negative ion prior to dissociation. For the oxaloacetic acid, the transitory anion arises from the capture of the electron directly into some valence states, while, for the citric acid, dipole- or multipole-bound states mediate the transition into the valence states. What is also of high importance is that both compounds while undergoing DEA reactions generate highly reactive neutral species that can lead to severe cell damage in a biological environment. KW - dissociative electron attachment KW - negative ions KW - oxaloacetic acid KW - citric acid KW - mass spectrometry Y1 - 2021 U6 - https://doi.org/10.3390/ijms22147676 SN - 1422-0067 VL - 22 IS - 14 PB - MDPI CY - Basel ER - TY - GEN A1 - Kopyra, Janina A1 - Wierzbicka, Paulina A1 - Tulwin, Adrian A1 - Thiam, Guillaume A1 - Bald, Ilko A1 - Rabilloud, Franck A1 - Abdoul-Carime, Hassan T1 - Experimental and theoretical studies of dissociative electron attachment to metabolites oxaloacetic and citric acids T2 - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - In this contribution the dissociative electron attachment to metabolites found in aerobic organisms, namely oxaloacetic and citric acids, was studied both experimentally by means of a crossed-beam setup and theoretically through density functional theory calculations. Prominent negative ion resonances from both compounds are observed peaking below 0.5 eV resulting in intense formation of fragment anions associated with a decomposition of the carboxyl groups. In addition, resonances at higher energies (3–9 eV) are observed exclusively from the decomposition of the oxaloacetic acid. These fragments are generated with considerably smaller intensities. The striking findings of our calculations indicate the different mechanism by which the near 0 eV electron is trapped by the precursor molecule to form the transitory negative ion prior to dissociation. For the oxaloacetic acid, the transitory anion arises from the capture of the electron directly into some valence states, while, for the citric acid, dipole- or multipole-bound states mediate the transition into the valence states. What is also of high importance is that both compounds while undergoing DEA reactions generate highly reactive neutral species that can lead to severe cell damage in a biological environment. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1156 KW - dissociative electron attachment KW - negative ions KW - oxaloacetic acid KW - citric acid KW - mass spectrometry Y1 - 2021 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-521829 SN - 1866-8372 IS - 1156 ER -