Mass selective anion-ZEKE spectroscopy of the iodine-water cluster

C. Bässmann, U. Boesl, D. Yang, G. Drechsler, E. W. Schlag

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53 Scopus citations


Mass selected and high resolution anion-ZEKE spectra of I-(H2O) are presented. Linewidths as narrow as 3 cm-1 have been observed for a resolution of the apparatus of 2 cm-1 (maximum resolution 1.5 cm-1). From a first tentative assignment we deduce electronic and vibrational information about the neutral ground and the lowest electronic excited states of the iodine-water cluster. The spectra exhibit the typical iodine spin-orbit splitting, two low frequency vibrational modes of 45 cm-1 and 210 cm-1 and a shift of the whole transition system of more than 3000 cm-1. The latter is mainly due to the strong interaction of the iodine anion with the water molecule. Rotational excitation is discussed. In addition, mass spectra of anionic iodine-water clusters (0 < n < 18) are presented. There is no evidence for thermodynamically preferred cluster size.

Original languageEnglish
Pages (from-to)153-167
Number of pages15
JournalInternational Journal of Mass Spectrometry and Ion Processes
Issue number1-3
StatePublished - 1996

Bibliographical note

Funding Information:
The authors thank the Deutsche Forschungs-gemeinschaft for financial support of this work (Project No. Bo 718/5).


  • Anion mass spectrometry
  • Anion spectroscopy
  • Iodine-water cluster
  • Photodetachment photoelectron spectroscopy
  • ZEKE-spectroscopy

ASJC Scopus subject areas

  • Spectroscopy


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