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Acta Chimica Sinica ›› 2009, Vol. 67 ›› Issue (17): 2031-2037. Previous Articles     Next Articles

Original Articles

大气环境中的水分子团簇分布和H＋(H2O)n (n＝4～16)离子的解离

杨 鹏a 叶招莲b 蒋公羽a 李 周a
丁传凡a 侯惠奇*,b

  

  1. (a复旦大学化学系 上海 200433)
    (b复旦大学环境科学研究所 上海 200433)

  • 投稿日期:2008-12-04 修回日期:2009-03-03 发布日期:2009-09-14
  • 通讯作者: 侯惠奇

Water Cluster Distribution under Ambient Conditions and Dissociation of H＋(H2O)n (n＝4～16) Using Mass Spectrometry in Atmosphere

Yang, Penga Ye, Zhaolianb Jiang, Gongyua Li, Zhoua
Ding, Chuanfana Hou, Huiqi*,b

  

  1. (a Laser Chemistry Institute and Department of Chemistry, Fudan University, Shanghai 200433)
    (b Department of Environment, Fudan University, Shanghai 200433)
  • Received:2008-12-04 Revised:2009-03-03 Published:2009-09-14
  • Contact: Hou, Huiqi

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The distribution of water clusters under ambient conditions was first tested using a triple-quad-
rupole mass spectrometer coupled with a dielectric barrier discharge ionization source. The water exists as clusters rather than a single molecule under the ambient conditions, and the cluster distribution is dependent on the humility of atmosphere, or the water vapor pressure. In addition to the cluster with the magic number n＝21, H＋(H2O)n was also observed in the ambient condition, and H＋(H2O)4, H＋(H2O)10 and H＋(H2O)15 were found more stable according to the experiment. The dissociation products of H＋(H2O)n (n＝4～16) clusters were further studied with a collision induced dissociation (CID) method. The product ions were mainly H＋(H2O)n (n＝4～6). The CID products of H＋(H2O)10 with the collision gas pressure were also studied.

Key words: ambient condition, water cluster, mass spectrometry, dissociation

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