芳香族碳氢化合物等离子体化学反应的研究

本文研究了七种芳香族碳氢化合物的气相IR激光化学,主要是等离子体化学.实验说明.在功率密度I≤13.5GW·CM~(-2)下,它们不能通过红外多光子吸收发生可检测的反应,仅当它们与环境气体混合击穿—成等离子体时,才有明显的反应发生.反应的结果,它们均以乙炔为主要产物,并伴有少量其它小分子碳氢化合物生成.实验还证实了该条件下它们的反应属等离子体下的热反应,并非等离子体辐射引起的光反应,且初始过程中包括单分子最弱键断裂的基元反应.

Study of Plasma Chemical Reaction of Some Aromatic Hydrocarbons

IR laser chemistry (mainly plasma chemistry) of gaseous aromatic hydrocarbons was studied with a pulsed TEA-CO_2 laser. Experimental results show that they do not undergo appreciable photochemical reactions via multiphoton absorption processes in the cases of laser flow up to 13.5 GW. cm~(-2). When they are mixed with environmental gases, especially the plasma forms, the extensive dissociation of aromatic hydrocarbons occurs. The result is that a series of smaller hydrocarbon molecules are resulted, in which acetylene is the principal product. It is also confirmed that the dissociation of gaseous aromatic hydrocarbons proceeds through thermal processes and not through photochemical processes initiated by the ultraviolet light emitted from the breakdown plasma. The Prior processes of dissoaiation also include unimolecular weakest C-C bond fission to a minor extent.