Signature inversion in doubly odd124La

Propagation of uncertainty in experiment: structures of Ni (II) coordination complexes

“…The Ni complexes are in a frozen solution of 15 mM, kept at a temperature of $ 80 K, so as to observe and quantify structure in the absence of thermal disorder. For each complex, an XAS transmission spectrum is collected following high-accuracy Hybrid methodologies (Chantler, 2010), providing experimental data with high point accuracy (HPA) and with the spectra corrected for experimental systematics including energy calibration, dark current, harmonic contamination and scattering using published methods (Tran et al, 2004;Glover & Chantler, 2009;Barnea et al, 2011;Islam et al, 2014;Tantau et al, 2015). Additionally, a spectrum is also taken using a faster method for each complex, which trades accuracy for higher point density, in an experiment where time constraints did not permit both.…”

“…XERT typically takes ten repeats for the same sample and aperture combination at each measured energy. XERT performs additional measurements to aid in the correction of experimental systematics such as dark current, so the calculation of final uncertainties in ½= becomes less trivial, with procedures outlined by Tran et al (2004), de Jonge et al (2007), Chantler (2010) and . The determination of experimental uncertainties for ½= is further complicated in the case of a Hybrid experimental setup, especially for millimolar solutions, as is true for the data for this work Islam et al, 2016).…”

Two‐dimensional quantitative imaging of multicomponent samples using polychromatic X‐rays

“…At each position in the 2D maps of the ratios of intensities (Figure 4a and 4b), Equation (7) were taken from the predetermined results as shown in Figure 3a and 3b (solid lines), respectively; the monochromatic mass attenuation coefficients, the densities of aluminium ρ Al = 2.6941 g/cm 3 and of copper ρ Cu = 8.96 g/cm 3 were taken from NIST database. [1] Each value of (ρt) Al corresponded to a different level of attenuation in the incident beams, leading to different spectra, S(E) 1, Al and S(E) 2, Al , being attenuated by the copper component. These spectra were calculated using the monochromatic Beer-Lambert law, that is, S(E) i, These terms were then used to solve for the column thicknesses, (ρt) Cu , of copper by employing Equation (7).…”

“…The interaction between X-rays and matter can been described at the atomic level using the concept of complex atomic form factors. [1,2] At the bulk material scale, the interaction cross sections are described either in terms of the complex indices of refraction [3] or the absorption and scattering coefficients. [1,2] These interaction coefficients vary as function of energy of the incident X-ray photons, chemical composition, and the mass density of the object.…”

“…[1,2] At the bulk material scale, the interaction cross sections are described either in terms of the complex indices of refraction [3] or the absorption and scattering coefficients. [1,2] These interaction coefficients vary as function of energy of the incident X-ray photons, chemical composition, and the mass density of the object. As a consequence, high precision quantitative X-ray imaging work often necessitates the use of monochromatic incident beams and homogeneous samples.…”