X-ray mass attenuation coefficients and imaginary components of the atomic form factor of zinc over the energy range of 7.2-15.2 keV

Rae, NA; Chantler, CT; Barnea, Z; de Jonge, MD; Tran, CQ; Hester, JR

X-ray mass attenuation coefficients and imaginary components of the atomic form factor of zinc over the energy range of 7.2-15.2 keV

Date

2010-02

Authors

Publisher

American Physical Society

Abstract

The x-ray mass attenuation coefficients of zinc are measured in a high-accuracy experiment between 7.2 and 15.2 keV with an absolute accuracy of 0.044% and 0.197%. This is the most accurate determination of any attenuation coefficient on a bending-magnet beamline and reduces the absolute uncertainty by a factor of 3 compared to earlier work by advances in integrated column density determination and the full-foil mapping technique described herein. We define a relative accuracy of 0.006%, which is not the same as either the precision or the absolute accuracy. Relative accuracy is the appropriate parameter for standard implementation of analysis of near-edge spectra. Values of the imaginary components f″ of the x-ray form factor of zinc are derived. Observed differences between the measured mass attenuation coefficients and various theoretical calculations reach a maximum of about 5% at the absorption edge and up to 2% further than 1 keV away from the edge. The measurements invite improvements in the theoretical calculations of mass attenuation coefficients of zinc. © 2010, American Physical Society

Keywords

Attenuation, Zinc, Absorption, Accuracy, Theoretical data, Mapping

Citation

Rae, N. A., Chantler, C. T., Barnea, Z., de Jonge, M. D., Tran, C. Q., & Hester, J. R. (2010). X-ray mass attenuation coefficients and imaginary components of the atomic form factor of zinc over the energy range of 7.2-15.2 keV. Physical Review A, 81(2), 10. doi:10.1103/PhysRevA.81.022904