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12 papers · 1 filter
The importance of an accurate target wave function in variational calculations for (e^{+}-H_{2}) scattering
J. N. Cooper, E. A. G. Armour, M. Plummer
Using the complex Kohn method, we have calculated variational values of phase shifts and the annihilation parameter, Z_{eff}, for the elastic scattering of positrons by molecular h…
Anomaly-free singularities in the generalized Kohn variational method
J. N. Cooper, E. A. G. Armour, M. Plummer
We have carried out an analysis of singularities in Kohn variational calculations for low energy e^{+}-H_{2} elastic scattering. Provided that a sufficiently accurate trial wavefun…
Determination of the single-ion anisotropy energy in a S = 5/2 kagome antiferromagnet using X-ray absorption spectroscopy
M. A. de Vries, T. K. Johal, A. Mirone +5
We report x-ray absorption and x-ray linear dichroism measurements at the Fe L2,3 edges of the geometrically frustrated systems of potassium and hydronium iron jarosite. Comparison…
Medium-energy ion-scattering study of strained holmium silicide nanoislands grown on silicon (100)
T. J. Wood, C. Eames, C. Bonet +4
We have used medium-energy ion scattering (MEIS) to quantitatively analyze the structure of holmium silicide islands grown on the Si(100) surface. Structure fitting to the experime…
Nature of the 5f states in actinide metals
Kevin T. Moore, Gerrit van der Laan
Actinide elements produce a plethora of interesting physical behaviors due to the 5f states. This review compiles and analyzes progress in understanding of the electronic and magne…
Short wavelength regenerative amplifier free electron lasers
D. J. Dunning, B. W. J. McNeil, N. R. Thompson
In this paper we discuss extending the operating wavelength range of tunable Regenerative Amplifier FELs to shorter wavelengths than current design proposals, notably into the XUV…