Three attempts and one success in addressing the bandgap closure in mercury clusters

Ram Busani, Mareike Folkers, Ori Cheshnovsky*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


We review the ups and downs of three projects, in which we tried to address the problem of bandgap closure in mercury clusters over the last 18 years. The first project aimed at measuring the polarizability of neutral mercury clusters. This project stopped with the appearance of the polarizability measurements from Knighfs group. In the second project we measured the photoelectron spectra of mass-selected negatively charged mercury clusters Hg-n in the size range n = 3-250. The spectra were characterized by gaps which shrink with increasing n Those gaps represent the s-p excitation bandgaps of the corresponding neutral clusters. Extrapolation of the bandgap to higher cluster size indicated complete closure at the size range n = 400 ± 30, a considerably larger value than previously reported (n = 80-100). We present here new photoelectron spectra taken with 6.4 eV photons which reinforce the above conclusion. In the third project we measured the photoelectron spectra of HgnI- clusters. We had hoped to extract from these spectra the static dielectric response of neutral mercury clusters. We present these recent results and explain their failure to deliver the desired dielectric response.

Original languageEnglish
Pages (from-to)1427-1436
Number of pages10
JournalPhilosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Issue number9
StatePublished - Sep 1999


FundersFunder number
James Franck German-Israeli Binational Program
US-Israel Binational Foundation
Israel Academy of Sciences and Humanities
Israel Science Foundation


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