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• 作者：Yi-Lun Sun ; Wen-Jian Huang ; Shih-Huang Lee
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：October 15, 2015
• 年：2015
• 卷：6
• 期：20
• 页码：4117-4122
• 全文大小：356K
• ISSN：1948-7185

文摘

Some of the polyynes (HC_2n+2H, 1 鈮?n 鈮?4) are observable in planetary atmospheres, interstellar space, and flames. Polyynes are proposed to play an important role in synthesis of large carbonaceous molecules. We explore the dynamics of reactions of C_2nH (n = 1鈥?) radicals with C₂H₂ by interrogating time-of-flight spectra and photoionization efficiency spectra of products C_2n+2H₂. The reactions of n = 2鈥? were investigated for the first time. The translational energy release is biased to low energy but extends to the energetic limit of product HC_2n+2H + H, corresponding to a fraction of 0.34鈥?.36 on translational energy. Product C_2n+2H₂ has a deconvoluted ionization threshold in good agreement with the ionization energy of polyynes. The quantum chemical calculations support the experimental observations. This work verifies that the title reaction is an important source for formation of polyynes that have been observed in interstellar/circumstellar media and combustion processes.