@article{oai:rikkyo.repo.nii.ac.jp:00010713,
 author = {Kubotera, Hayato and Sakai, Satoshi and Sekitsuka, Tatsuya and Tachibana, Takayuki and Hirayama, Takato},
 issue = {4},
 journal = {Applied Surface Science, Applied Surface Science},
 month = {Nov},
 note = {We present the electron energy loss spectra for Ar clusters as a function of incident electron energy and of cluster size. In spectra measured with 100 eV incident electron energy the bulk excitation peak becomes visible for a mean cluster size above 170 atoms per cluster. For 250 eV incident electron energy the bulk excitation peak is clearly observable even for a mean cluster size of 120 atoms per cluster. These experimental results are qualitatively reproduced by a simple calculation that accounts for the mean free path of electrons in Ar clusters; i.e., the penetration depth of incident electrons into the cluster. (C) 2009 Elsevier B.V. All rights reserved.},
 pages = {1046--1049},
 title = {Electronic excitation processes in rare gas clusters studied by electron energy loss spectroscopy},
 volume = {256},
 year = {2009}
}