Breaking the disulfide chemical bond using high energy photons: the dimethyl disulfide and methyl propyl disulfide molecules
সংরক্ষণ করুন:
| লেখক: | , , , , , , |
|---|---|
| বিন্যাস: | artículo original |
| প্রকাশনার তারিখ: | 2017 |
| বিবরন: | In order to study the stability of the disulfide chemical bond in molecules subjected to a flux of high energy photons, the ionic fragmentation of two molecules containing a disulfide chemical bond, dimethyl disulfide (DMDS) and methyl propyl disulfide (MPDS), has been studied following excitation around the S 1s edge (∼2470 eV). Synchrotron radiation and electron-ion coincidence techniques were used. The core excited states of DMDS and MPDS have also been theoretically investigated at the multiconfigurational self-consistent field (MCSCF) level and multireference perturbation theory. Deep core excitation (S 1s) induces multiple ionization and intense fragmentation of the molecules, as clearly demonstrated by the observation of cations such as S+, S2+ and S3+. Splitting of the S+ peak is observed in the mass spectra of the two molecules when they are excited to a resonant state with antibonding (S–S) character. Although fragments associated with the breakage of the disulfide bond (S+ and CHnS+) play a dominant role in the dissociation of the molecules, a fragment containing the disulfide chemical bond, S2+, survives, nevertheless, at all photon energies. |
| দেশ: | Kérwá |
| প্রতিষ্ঠান: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/79813 |
| অনলাইন ব্যবহার করুন: | https://pubs.rsc.org/en/content/articlepdf/2017/ra/c7ra05001a https://hdl.handle.net/10669/79813 |
| মুখ্য শব্দ: | Synchrotron NEXAFS PEPIPICO Bio-molecules Mass Spectoscopy DMDS PMDS |