S.E.M.A.Ph.Or.E COMETAIRE,a tool for the study of the photochemical decomposition of probable large organic molecules in comets. first application: Polyoxymethylene |
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| Institution: | 1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China;2. State Key Laboratory of Marine Resource Utilization in South China Sea, School of Materials Science and Engineering, Hainan University, Haikou 570228, China;1. Università della Calabria, Dipartimento di Biologia, Ecologia e Scienze della Terra (DiBEST), Via Pietro Bucci 87036, Arcavacata di Rende, CS, Italy;2. Dipartimento di Scienze Biologiche, Geologiche e Ambientali–Sezione di Scienze della Terra, Università di Catania, Corso Italia 57, 95129 Catania, Italy;3. Istituto di Scienze dell''Atmosfera e del Clima, ISAC-CNR, Via Gobetti 101, 40129 Bologna, Italy;1. School of Public Health, Qingdao University, Qingdao, China;2. Department of Toxicology, School of Public Health, Sun Yat-sen University, Guangzhou, China;3. School of Public Health, Capital Medical University, Beijing, China;4. School of Public Health, China Medical University, Shenyang, China;5. Department of Toxicology, School of Public Health, Hebei Medical University, Shijiazhuang, China |
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| Abstract: | This paper presents a current experimental program concerning the study of the photochemical evolution of the organic matter ejected from the cometary nucleus. The aim of the work is to better understand, using laboratory simulations, the mechanisms which are involved in the degradation of the high molecular weight organics in cometary ices and dust when they are submitted to the warming up and to the bombardment of photons in the surrounding area of the Sun. This experimental study will establish correlations between the nucleus and the molecular composition of the coma. Furthermore, experimental data will provide useful information to bring to a close the question of the origin of the extended sources of H2CO and CO. Polyoxymethylene, suspected to be present in the cometary nucleus, is often mentioned as a possible parent molecule for the extended source of H2CO. In order to test this hypothesis, irradiation of POM has been performed at 147 nm. The preliminary results show effectively H2CO as one photodegradation product as well as CO. C02 and HCOOH. Tentative detections of CH30CH3, CH3OCH2OCH3, CH3OCHO and C3H6O3 are also presented. |
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