Multiphoton fragmentation spectra of zirconium and niobium cluster cations

Aydin M., Lombardi J. R.

International Journal of Mass Spectrometry, vol.235, no.1, pp.91-96, 2004 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 235 Issue: 1
  • Publication Date: 2004
  • Doi Number: 10.1016/j.ijms.2004.04.004
  • Journal Name: International Journal of Mass Spectrometry
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.91-96
  • Keywords: Laser vaporization, Multiphoton fragmentation, Niobium, Time-of-flight mass spectroscopy, Zirconium
  • Ondokuz Mayıs University Affiliated: No

Abstract

The dissociation energies of the mass-selected zirconium dimer cation (90Zr2+) and niobium cation clusters, Nb 2+ and Nb4+, were investigated using laser vaporization techniques coupled with time-of-flight (TOF) mass spectroscopy for production of jet-cooled cationic cluster beams. The selected cationic species were then fragmented by irradiation with an Nd:YAG-pumped (532 nm), tunable-pulsed PDL dye laser in the 15,500-18,500 cm-1 region. Dissociation energies were directly measured from a significant sharp rise in the spectral background as D0(90Zr2 +)=4.18±0.01, D0(Nb2+)=5. 94±0.01, and D0(Nb+3-Nb)=5.994±0. 004 eV. We also estimate the first ionization energy of 90Zr 2+ to be 5.82±0.01 eV using the thermochemical cycle. © 2004 Elsevier B.V. All rights reserved.