Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (10): 1113-1116.doi: 10.3866/PKU.WHXB20051010

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Cluster- assistant Multiply Ionization of Acetonitrile by Nanosecond Laser

SHAO Shi-yong; LI Hai-yang; LUO Xiao-lin; XIAO Xue; NIU Dong-mei; WEN Li-hua; WANG Bin; LIANG Feng; HOU Ke-yong   

  1. Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031； Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023
  • Received:2005-02-01 Revised:2005-04-29 Published:2005-10-15
  • Contact: LI Hai-yang E-mail:hli@dicp.ac.cn

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Abstract: The photoionization of acetonitrile seeded in helium is studied by time- of- flight mass spectrometry using a 25 ns, 1064 nm Nd：YAG laser with intensity near 1011 W•cm－２. Multiply charged ions of Nq+(q=1～5) and Cq+(q=1～4) with hundreds of eV have been observed under laser beam irradiation with the densest portion of the pulsed molecular beam. An electron re-scattering and re-colliding ionization model is proposed to explain the generation of those multiply charged clusters under such low laser intensity.

Key words: Acetonitrile, Cluster, coulomb explosion, Multiply charged ion