Academic Journal
Journal of Photochemistry and Photobiology A: Chemistry 135 (2000) 53–64 An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm
| العنوان: | Journal of Photochemistry and Photobiology A: Chemistry 135 (2000) 53–64 An experimental study of the photodegradation of polyoxymethylene at 122, 147 and 193 nm |
|---|---|
| المؤلفون: | Hervé Cottin, Marie-claire Gazeau, Jean-françois Doussin, François Raulin |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://w2.lisa.univ-paris12.fr/%7Ecottin/ph%26ph.pdf. |
| سنة النشر: | 2000 |
| المجموعة: | CiteSeerX |
| مصطلحات موضوعية: | Polyoxymethylene, UV irradiation, Photodegradation, Experimental design, Quantum yields, Comets |
| الوصف: | This paper presents results from a current experimental program whose aim is to determine quantitatively the photochemical evolution of organic molecules present or likely to be present in comets. Particularly, this includes the mechanisms involved in the degradation of high molecular weight compounds in cometary ices and dust, when they are submitted to photon bombardment in the surrounding area of the sun. Photodegradation of polyoxymethylene (–CH2–O–)n is studied at 122, 147 and 193 nm. Experimental setup and analytical methods are presented (FTIR, GC-MS). We have identified the main gaseous photodegradation products of polyoxymethylene: H2CO, CO, HCOOH, CO2, CH3OH, CH3OCHO, CH3OCH3OCH3 and C3H6O3 (trioxane). We have determined the production quantum yields for formaldehyde (8122 nmD0.750.21, 8147 nmD0.960.19) and formic acid (8122 nmD0.130.05, 8147 nmD0.260.10), and roughly estimated the yields for the other compounds. Such data, that were missing to interpret astronomical observations of comets, are now available for further theoretical studies. We also propose mechanisms involved in the production of these molecules from polyoxymethylene. © 2000 Elsevier Science S.A. All rights reserved. |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1030.3731; http://w2.lisa.univ-paris12.fr/%7Ecottin/ph%26ph.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.1030.3731 http://w2.lisa.univ-paris12.fr/%7Ecottin/ph%26ph.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.3652426C |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |