IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
Experimental determination of cross sections for K-shell ionization by electron impact for C, O, Al, Si, and Ti
Autor/es:
S. P. LIMANDRI; MARCOS VASCONCELLOS; RUTH HINRICHS; JORGE TRINCAVELLI
Revista:
PHYSICAL REVIEW A - ATOMIC, MOLECULAR AND OPTICAL PHYSICS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2012 vol. 86 p. 1 - 10
ISSN:
1050-2947
Resumen:
Cross sections for K-shell ionization by electron impact were determined from films of Al, Si, and Ti and their oxides deposited on carbon substrates, for incident energies between 2.5 and 25 keV. The spectral processingof the x-ray emission spectra took into account corrections due to the presence of a spontaneous oxide layer formed on the monoelemental films and to the supporting material. Carbon K-shell ionization cross sections weredetermined from the contribution of the substrate to the measured spectra, while for oxygen, data from the three oxide films were taken. The mass thickness of the coatings was characterized by x-ray reflectivity. The resultsobtained were compared with other experimental data sets, semiempirical approaches, and theoretical models.