フォルステライトガラス表面における水分子の分解メカニズム

抄録

To investigate the decomposition mechanisms of adsorbed H₂O molecules as a monolayer on the surface of forsterite glass, we performed molecular dynamics calculations. The decomposition phenomenon of H₂O molecules is observed at temperatures above 200 K. The equilibrium rate of the decomposed H₂O increases as the temperature increases and approaches 1.0 at temperatures above 500 K. The decomposed hydrogen forms MgO_xH_y or SiO₄H_z structures with MgO_x or SiO_z units in forsterite glass. The processes of decomposition and reformation of the structure units on the surface of forsterite glass have important implications for chemical evolution in interstellar spaces.