塵粒子上の星間ホルムアルデヒドとメタノールの形成に対する氷組成の影響

The hydrogenation of CO on pure solid CO and CO-H2O mixed ice at temperatures between 8 and 15 K is investigated by use of cold atomic hydrogen beam (30 K). The formation of H2CO and CH3OH proceeds efficiently through the hydrogenation of CO on both pure solid CO and CO-H2O mixed ice below 12 K. Around at 15 K, the hydrogenation of CO on pure solid CO is significantly suppressed, however that in CO-H2O mixed ice proceeds efficiently. Hydrogenation of CO on pure solid CO at 12 K is enhanced by a presence of H2CO molecules on the surface. H2O molecules promote a hydrogenation of CO above 12 K (up to 20 K).
資料番号: AA0047898024