The dynamics of O(1D) +CO isotope exchange reaction

• Main Authors: Huang, Chia-Pin, 黃家彬
• Other Authors: Lin, Jim Jr-Min
• Format: Others
• Language: en_US
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/39078061873557127596

碩士 === 國立交通大學 === 應用化學系分子科學碩博士班 === 101 === The dynamics of the 18O(1D) + 28CO oxygen isotope exchange reaction has been studied using a crossed molecular beam apparatus at a collision energy of 5.56 kcal/mol. Two reaction channels are observed: isotope exchange in which quenching to O(3P) occurs and isotope exchange in which the product oxygen atom remains on the singlet surface. Non-quenching channel is the major channel with asymmetry angular distribution under this collision energy, accounting for 66% of all isotope exchange. The other channel occurs quenching which angular distribution is symmetric accounts for 34%. The electronic quenching proceeds via a CO2* complex that is long-lived with respect to its rotational period; however, non-quenching channel proceeds via CO2* complex with the lifetime is shorter than its rotational period. The new molecular-level details may help provide a more quantitative understanding of the heavy isotope enrichment in CO observed in the stratosphere.