Isotopic substitution as a probe of cluster structure, aufbau and isomerism in (benzene)N, N=11-20

David C. Easter, Joseph T. Khoury, Robert L. Whetten

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


Isotopically substituted benzene clusters (dilute C6H 6 in C6D6) in the N=11-20 range have been formed in a helium jet and interrogated through the C6H6 molecular B2u←A1g 000 and 601 transitions. The isotopic shift for perdeuterated vs hydrogenated benzene is sufficiently large that the former is spectroscopically transparent in the region of investigation. Line shapes for the singly substituted clusters are remarkably simple in appearance, being dominated by a few sharp lines at large spectral shift. This indicates that the predominant observed absorption for each size derives from the cluster's interior site. Analysis of the data strongly corroborates the icosahedral aufbau hypothesis and, in particular, a shell closing at N=13. Some aspects of the spectral simplification offer compelling new evidence for distinct stable isomers for several cluster sizes.

Original languageEnglish (US)
Pages (from-to)1675-1682
Number of pages8
JournalThe Journal of Chemical Physics
Issue number3
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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