UV photodestruction of CH bonds and the evolution of the 3.4 μm feature carrier
| Autor: | J.M. Greenberg, G. M. Muñoz Caro, R. Ruiterkamp, W. A. Schutte, Vito Mennella |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Physics Hydrogen Extinction (astronomy) chemistry.chemical_element Astronomy and Astrophysics Astrophysics Photochemistry Astrobiology Interstellar medium Hydrocarbon chemistry Space and Planetary Science Molecule Dehydrogenation Irradiation Layer (electronics) Astrophysics::Galaxy Astrophysics |
| Zdroj: | Astronomy & Astrophysics. 367:347-354 |
| ISSN: | 1432-0746 0004-6361 |
| DOI: | 10.1051/0004-6361:20000341 |
| Popis: | Experiments simulating the processing of various hydrocarbon species under diffuse and dense cloud conditions by UV irradiation were performed. The results indicate that such molecules will be efficiently dehydrogenated in interstellar space. It is argued that the presence of hydrogen in the aliphatic grain material in diffuse clouds results from an equilibrium between dehydrogenation by UV processing and re-hydrogenation by the impinging atomic gas. In dense clouds, the presence of the ice layer will prevent the re-hydrogenation process, causing the carbonaceous grain material to be gradually de-hydrogenated if UV photons are able to penetrate into the dense medium. The implications of this study for the evolution of the carbonaceous component of dust in the interstellar medium are discussed. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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