L{alpha}, L{beta}, and L{gamma} x-ray production cross sections of Hf, Ta, W, Re, Os, Au, Pb, and Bi by electron impact: Comparison of distorted-wave calculations with experiment

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.83.022702· OSTI ID:21537156

Fernandez-Varea, Jose M; Segui, Silvina; Dingfelder, Michael ^[1]

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1. Facultat de Fisica (ECM and ICC), Universitat de Barcelona, Diagonal 647, E-08028 Barcelona (Spain)

We study the emission of L{alpha}, L{beta}, and L{gamma} characteristic x rays by the impact of electrons on Hf, Ta, W, Re, Os, Au, Pb, and Bi atoms. To this end, ionization cross sections of the L{sub 1}, L{sub 2}, and L{sub 3} subshells of these atoms are calculated within the distorted-wave Born approximation. The considered energy interval spans from the ionization threshold up to 50 keV. Atomic relaxation parameters (i.e., Coster-Kronig and radiative transition probabilities, fluorescence yields, and emission rates) taken from the literature are then used to evaluate x-ray production cross sections. The theoretical predictions are compared with published experimental information. Good agreement is found for Ta, W, Os, Au, Pb, and Bi. In the case of Hf and Re, the measured cross sections are lower than the theoretical estimates by around 30%. The observed discrepancies might be attributed to the methods employed to correct the raw experimental data for the excess of detected characteristic x rays caused by the finite thickness of the sample's active layer and the presence of the thick substrate.

• OSTI ID: 21537156
• Journal Information: Physical Review. A, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevA.83.022702; (c) 2011 American Institute of Physics; ISSN 1050-2947
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
BISMUTH
COSTER-KRONIG TRANSITIONS
CROSS SECTIONS
DISTORTED WAVE THEORY
DWBA
ELECTRON-ATOM COLLISIONS
ENERGY LEVELS
EXPERIMENTAL DATA
FLUORESCENCE
GOLD
HAFNIUM
IONIZATION
OSMIUM
RELAXATION
RHENIUM
TANTALUM
TUNGSTEN
X RADIATION
APPROXIMATIONS
ATOM COLLISIONS
AUGER EFFECT
BORN APPROXIMATION
CALCULATION METHODS
COLLISIONS
DATA
ELECTROMAGNETIC RADIATION
ELECTRON COLLISIONS
ELEMENTS
EMISSION
ENERGY-LEVEL TRANSITIONS
INFORMATION
IONIZING RADIATIONS
LUMINESCENCE
METALS
NUMERICAL DATA
PHOTON EMISSION
PLATINUM METALS
RADIATIONS
REFRACTORY METALS
TRANSITION ELEMENTS