3.2.8.docx - 3.2.8 Practice 1 Dust particles are recognized...

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3.2.8 Practice 1. Dust particles are recognized as tiny and powerful nano-factories that produce chemical species. The mechanism that converts species on dust to gas species is elusive, but with experimental evidence, it can be concluded that species forming on interstellar dust analogs can be directly released into the gas. This is known as chemical desorption, which is caused by the excess of energy of an exothermic reaction, and was proposed as a key molecular release mechanism. It can, in principle, take place at any temperature 2. Researchers used silicate surfaces to model interstellar dust 3. The two reactions that were exothermic were OD + D D2O and O + O O2, both with exothermicity levels measured at 5.2. This relates to the fraction of the product released in the gas phase as how much heat was released from the reaction 4. The results of the study concluded with experimental evidence that species which form on the

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