激光溅射Cu等离子体与气相C2H5OH团簇的反应

用激光溅射-分子束技术研究了气相中Cu的等离子体与乙醇分子团簇的反应.观察到三种团簇正离子Cu＋(C2H5OH)n、CuO＋(C2H5OH)n、H＋(C2H5OH)n和三种团簇负离子(C2H5OH)nC2H5O－、(C2H5OH)n(H2O)OH－、(C2H5OH)n(H2O)2OH－(n≤12).详细考察了在不同的载气压力下激光烧蚀等离子体作用于脉冲分子束， 以及在一定的压力下等离子体作用于分子束不同位置时，对团簇产物种类和团簇尺寸大小的影响.分析了Cu＋(C2H5OH)n、CuO＋(C2H5OH)n、H＋(C2H5OH)n、(C2H5OH)nC2H5O－、(C2H5OH)n(H2O)OH－、(C2H5OH)n(H2O)2OH－等团簇的产生机理.

Gas Phase Reaction of Laser Ablated Cu Plasma with Ethanol Clusters

The gas phase reaction of Cu plasma and ethanol clusters is studied by the laser ablation-molecular beam(LAMB) method. Six species of clustered complex ions Cu＋(C2H5OH)n, CuO＋(C2H5OH)n, H＋(C2H5OH)n， (C2H5OH)nC2H5O－, (C2H5OH)n(H2O)OH－, (C2H5OH)n(H2O)2OH－(n≤12 ) are observed. Interestingly, the species and sizes of the product clusters vary observably either when the plasma acts on the different parts of the pulsed ethanol beam or when the carrier gas under different pressure is put on. When the laser ablated Cu plasma act on the low density part of the beam, the metal ethanol complex clusters Cu＋(C2H5OH)n and the protonated ethanol clusters H＋(C2H5OH)n are domainant, while the plasma act on the high density part of the beam, however, the H＋(C2H5OH)n turn to be the only discriminable resulting clusters . By comparing the intensities and the cluster sizes of Cu＋(C2H5OH)n with H＋(C2H5OH)n, the formation of Cu＋(C2H5OH)n is considered in company with the evaporation of several ethanol molecules. Under a given pressure and a specific laser delay time, the metal-oxygen-ethanol clusters CuO＋(C2H5OH)n are observed. As the intensity of(C2H5OH)n(H2O)OH－ is much stronger than that of (C2H5OH)nC2H5O－, one can suppose that (C2H5OH)n(H2O)OH－ is much more stable.