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Alternative TitleThe kinetic Monte Carlo model to verify the encounter desorption
Thesis Advisor常强
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Name理学硕士
Degree Discipline天体物理
Keyword天体化学,物种丰度,数值模拟,加速算法 Astrochemistry,Abundance,Simulation,Algorithm
Other AbstractThe surface reactions are important for forming the fatal species in the space, so grain-surface reactions(on the grain mantle) draw much attention from the researchers for a long time. The grain-surface desorption reaction, which cause the grain-surface species to move to the gaseous phase, become the bind to connect the gas and grain along with the absorption reaction. The water ice is considered as the substrate for the grain-surface species to desorb from. Whereas the abundance of gH is rather high when the environment is cold, only taking account of the gH2O substrate is incomplete. The encounter desorption for Ha is put forward under the circumstances. The encounter desorption for H2 is such a mechanism: when one gH2 molecule on the grain come across another gH2, one of them will desorb from the grain to the gas phase. It has been verified by the rate-equation model already, however the results of the rate-equation is not precise when the abundance of a particular grain-surface species is below one unit. The more suitable model, Monte Carlo model is too time-consuming computationally to verify the mechanism. In the thesis,a pyramid data structure is promoted to save 80 percent of the computing time in the network to evaluate encounter desoption. The data structure improved accelerating method and accelerated Gillespie algorithm are both used to the grain-gas phase kinetic Monte Carlo model to verify the encounter desoption. In the model it shows that the encounter desorption will decrease the abundance of gH2. Furthermore, the encounter desorption for H, in which a gH atom will desorb from the gH2, is verified as well. The results shows that the abundance of the species forming water ice is slightly changed, nevertheless some of the abundance of the species change remarkably about more than 3 magnitude. The encounter desorption provide a new thinking about the detemination of some grain-surface species' abundance and would change some of their abundance in a large scale.
Document Type学位论文
First Author AffilicationXinjiang Astronomical Observatory, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
郑旭丽. 动力学蒙特卡洛方法验证碰撞脱附效应[D]. 北京. 中国科学院大学,2019.
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