Ionization potentials and fragmentation thresholds of the heteroclusters benzene-(SF6)m, m = 1–4

✍ Scribed by W. Radloff; V. Stert; H.-H. Ritze; Th. Freudenberg

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 573 KB
• Volume: 205
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(93)89224-6

✦ Synopsis

Applying mass selective We-color resonant two-photon ionization spectroscopy, we have measured the ionization and fragmentation thresholds of small benzene-( SF,),,, clusters. For the resonant excitation ofthe electronic S, state either the @ vibrationless transition or the 6: vibronic transition of the heteroclusters were used. Simple theoretical model estimations were considered to interpret the experimental results. As results well defined ionization potentials for the four clusters benzene-( SF&,, m= l-4, were obtained while the measured fragmentation threshold could be identified as the appearance potential only for the two smallest heteroclusters (m= 1,2). In this case the binding energies of the clusters in the ionic and the neutral ground states have been derived. For the larger clusters (rn = 3,4) a kinetic shift has been observed causing higher fragmentation thresholds than the true appearance potentials