Understanding the Impact of H_(2) Diffusion Energy on the Formation Efficiency of H_(2) on the Interstellar Dust Grain Surface  

作　　者：Xiaoying Guo Wasim Iqbal Qiang Chang Xiao-Hu Li 

机构地区：[1]School of Physics and Optoeletronic Engineering,Shandong University of Technology,Zibo 255000,China [2]Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China [3]Key Laboratory of Radio Astronomy,Chinese Academy of Sciences,Urumqi 830011,China

出　　处：《Research in Astronomy and Astrophysics》2024年第9期190-198,共9页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.12173023);the Xinjiang Tianchi Talent Program(2024)。

摘　　要：We use microscopic Monte Carlo simulation techniques to investigate the impact of H_(2)diffusion energy on the recombination efficiency of H_(2)on interstellar dust grain surfaces under diffuse and translucent cloud conditions.We constructed five models representing different possible conditions encountered by adsorbed H and H_(2)on interstellar dust grains.We implemented adsorption sites with multiple binding energies for surface species;the Encounter-Desorption mechanism was also included.The study focused on silicate surfaces in diffuse clouds and water ice surfaces in translucent clouds.The results show that the recombination efficiency of H_(2)on dust surfaces decreases as H_(2)diffusion energy increases.An interesting finding of this work is that considering different binding sites for H and H_(2)gives rise to multiple steady phases,during which the recombination efficiency remains constant with a change in H_(2)diffusion energy.

关 键 词：ASTROCHEMISTRY atomic processes ISM:molecules 

分 类 号：P148[天文地球—天体物理] P155.2[天文地球—天文学]