Experimental and theoretical studies of (CsI)n Cs+ cluster ions produced by 355 nm laser desorption ionization.

نویسندگان

  • F A Fernandez-Lima
  • C Becker
  • K Gillig
  • W K Russell
  • Marco Antonio Chaer Nascimento
  • D H Russell
چکیده

Collision cross-sections of gas-phase (CsI)n = (1-7)Cs(+) cluster ions formed by pulsed-UV laser (355 nm) desorption ionization are measured by ion mobility-mass spectrometry. Experimental collision cross-sections are compared with calculated cross sections of candidate structures generated from a search for the lowest energy structures at the DFT/B3LYP/LACV3P** and MP2/LACVP3P** levels. The relative stabilities of these candidate structures are examined by IM-CID-MS, and the experimental results are compared to theoretical predictions. Analysis of (CsI)n = (1-7)Cs(+) cluster ion dissociation energies shows that the lower fragmentation thresholds are observed for cluster ions with the lower predicted stability.

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عنوان ژورنال:
  • The journal of physical chemistry. A

دوره 112 44  شماره 

صفحات  -

تاریخ انتشار 2008