Calculations of stopping powers of 100 eV-30 keV electrons in 31 elemental solids

Journal Article · Sat Mar 15 00:00:00 EDT 2008 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2891044· OSTI ID:21133997

Tanuma, S ^[1]; Powell, C J; Penn, D R ^[2]

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1. Materials Analysis Station, National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
2. National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8370 (United States)

We present calculated electron stopping powers (SPs) for 31 elemental solids (Li, Be, glassy C, graphite, diamond, Na, Mg, K, Sc, Ti, V, Fe, Y, Zr, Nb, Mo, Ru, Rh, In, Sn, Cs, Gd, Tb, Dy, Hf, Ta, W, Re, Os, Ir, and Bi). These SPs were determined with an algorithm previously used for the calculation of electron inelastic mean free paths and from energy-loss functions (ELFs) derived from experimental optical data. The SP calculations were made for electron energies between 100 eV and 30 keV and supplement our earlier SP calculations for ten additional solids (Al, Si, Cr, Ni, Cu, Ge, Pd, Ag, Pt, and Au). Plots of SP versus atomic number for the group of 41 solids show clear trends. Multiple peaks and shoulders are seen that result from the contributions of valence-electron and various inner-shell excitations. Satisfactory agreement was found between the calculated SPs and values from the relativistic Bethe SP equation with recommended values of the mean excitation energy (MEE) for energies above 10 keV. We determined effective MEEs versus maximum excitation energy from the ELFs for each solid. Plots of effective MEE versus atomic number showed the relative contributions of valence-electron and different core-electron excitations to the MEE. For a maximum excitation energy of 30 keV, our effective MEEs agreed well for Be, graphite, Na, Al, and Si with recommended MEEs; a difference for Li was attributed to sample oxidation in the SP measurements for the recommended MEE. Substantially different effective MEEs were found for the three carbon allotropes (graphite, diamond, and glassy C)

• OSTI ID: 21133997
• Journal Information: Journal of Applied Physics, Vol. 103, Issue 6; Other Information: DOI: 10.1063/1.2891044; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALGORITHMS
BERYLLIUM
CESIUM
DIAMONDS
DYSPROSIUM
ELECTRON BEAMS
ELECTRONS
ENERGY LOSSES
EV RANGE 100-1000
GADOLINIUM
GRAPHITE
HAFNIUM
INNER-SHELL EXCITATION
IRIDIUM
IRON
KEV RANGE 10-100
LITHIUM
MAGNESIUM
MEAN FREE PATH
MOLYBDENUM
NIOBIUM
OSMIUM
OXIDATION
POTASSIUM
RELATIVISTIC RANGE
RHENIUM
RHODIUM
RUTHENIUM
SCANDIUM
STOPPING POWER