Interband, collective and atomic (p, d) excitations from 2 to 160 eV in Sc, Y, lanthanides and actinides and in some of their compounds by FEELS

2014 Fast electron energy loss spectroscopy (FEELS) is used to obtain the various optical constants over a large energy range in Sc, Sc2O3, Y, Y2O3, Gd, Gd2O3, Dy, LaF3, GdF3, DyF3, Th, ThF4, U and UF4. For the first time a comprehensive study of the 3p to 6p spectra is performed in the 30-60 eV range, Z varying between 21 and 92. Interesting common features of these resonant p spectra are emphasized and discussed in the light of recent theoretical work. Below 30 eV, strong interband transitions are observed in the wide gap insulators (oxides and fluorides), while the metal spectra are dominated by collective or plasmon excitations. At higher energies, 4d-lanthanide and 5d-actinide spectra are compared with X-UV photoabsorption measurements. J. Physique 41 (1980) 603-613 JUILLET 1980,

[1]  C. Wehenkel.  Mise au point d'une nouvelle méthode d'analyse quantitative des spectres de pertes d'énergie d'électrons rapides diffusés dans la direction du faisceau incident : application à l'étude des métaux nobles , 1975 .

[2]  R. Haensel,et al.  Optical absorption measurements of the transition metals Ti, V, Cr, Mn, Fe, Co, Ni in the region of 3p electron transitions , 1969 .

[3]  C. Kunz,et al.  Giant Resonance Enhancement of the4f,5p, and5sStates in the Photoemission Spectra of Rare-Earth Compounds , 1978 .

[4]  J. Riga,et al.  High resolution esca study of uranium fluorides: UF4 and K2UF6 , 1977 .

[5]  J. Connerade.  The Non-Rydberg spectroscopy of atoms , 1978 .

[6]  B. Gauthé,et al.  Electron-energy loss spectra and optical constants of uranium , 1974 .

[7]  J. Bearden,et al.  REEVALUATION OF X-RAY ATOMIC ENERGY LEVELS. , 1967 .

[8]  A. Burr,et al.  X-ray photoelectron studies of thorium and uranium , 1974 .

[9]  M. Gasgnier,et al.  Analysis of the electron excitation spectra in heavy rare earth metals, hydrides and oxides , 1976 .

[10]  R. Haensel,et al.  Optical absorption of cerium, cerium oxide, praseodymium, praseodymium oxide, neodymium, neodymium oxide and samarium in the extreme ultraviolet , 1970 .

[11]  J. Daniels.  Bestimmung Optischer Konstanten Von Gadolinium Und Dysprosium Durch Energieverlustmessungen Von 60 keV Elektronen , 1971 .

[12]  M. J. Lynch,et al.  The Characteristic Loss Spectra of the Second and Third Series Transition Metals , 1968 .

[13]  U. Fano,et al.  Raising of Discrete Levels into the Far Continuum , 1971 .