Photoelectron spectroscopy of 7-azaindole—water cluster anions

  • A. Nakajima
  • Y. Negishi
  • R. Hasurni
  • K. Kaya
Conference paper


The 7-azaindole (7-AzI) cluster anions and their H2O adducts were generated by electron attachment to the 7-AzI/7-AzI-H2O clusters, and their electronic properties studied with mass spectrometry and photoelectron spectroscopy. In the mass spectra of the 7-AzI cluster anions, (7-AzI) n , monomer anions were missing clue to negative electron affinity (EA), while clusters (n ≥ 2) have positive EA, and those having even n were more abundant than those at odd n. EA increased with cluster size from 0.88 eV at n = 2, and an even-odd alternation in the EA was seen. The even-odd alternation showed that the 7-AzI dirtier acts as a unit for cluster formation. In the photoelectron spectrum of (7-AzI) 2 at 266 nm, the second peak was observed 2,4 eV above the first peak; this is attributed to the triplet state of the neutral (7-AzI)2 Depending on the detachment energy, a movable peak, with the detachment of 420–300 nm (2.9–4.1 eV), was additionally observed between the first and the second peaks; this was thought to be caused by a delayed photoemission via an electronic excited state of the (7-AzI) 2 anion.


36.40.−c Atomic and molecular clusters 82.30.Nr Association, addition, insertion, cluster formation, hydrogen bonding 71.24.+q Electronic structure of clusters and nanoparticles 


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Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • A. Nakajima
    • 1
  • Y. Negishi
    • 1
  • R. Hasurni
    • 1
  • K. Kaya
    • 1
  1. 1.Department of Chemistry, Faculty of Science and TechnologyKeio UniversityKohoku-ku, YokohamaJapan

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