Acta Phys. -Chim. Sin. ›› 2003, Vol. 19 ›› Issue (12): 1114-1118.doi: 10.3866/PKU.WHXB20031204

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Gas Phase Reaction of Laser Ablated Cu Plasma with Ethanol Clusters

Niu Dong-Mei;Zhang Shu-Dong;Zhang Xian-Yi;Li Hai-Yang   

  1. Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031
  • Received:2003-05-14 Revised:2003-07-28 Published:2003-12-15
  • Contact: Li Hai-Yang

Abstract: 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.

Key words: Laser ablation, Cu plasma, Ethanol clusters, Time of flight mass spectrum