title: 4d-->4f dipole resonance of the metal atom encapsulated in a fullerene cage: Ce@C82.
abstract: The yield curves for photoions from Ce@C(82) are measured by using synchrotron radiation in the photon energy range from 90 to 160 eV. Parent Ce@C(82) (z+) and fragment ions C(60) (z+) and C(70) (z+) are observed in a mass spectrum (z=1 and 2). The yield curves for doubly charged ionic species exhibit broad resonance in the photon energy region of from 120 to 140 eV which is ascribed to the 4d-->4f giant dipole resonance of the encapsulated Ce atom. The total photoabsorption cross section of Ce@C(82) was determined from partial photoionization cross sections for formation of the parent and fragment ions to be 5.3(-1.1) (+1.8) and 19.6(-3.9) (+6.5) Mb at photon energies of 110 and 130 eV, respectively.
authors.affiliation: Department of Vacuum UV Photo-Science, The Institute for Molecular Science, Myodaiji, Okazaki 444-8585, Japan. mitsuke@ims.ac.jp
authors.forename: Koichiro
authors.initials: K
authors.lastname: Mitsuke
authors.forename: Takanori
authors.initials: T
authors.lastname: Mori
authors.forename: Junkei
authors.initials: J
authors.lastname: Kou
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Haruyama
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kubozono