  The real-space Green's function code FEFF has been extensively developed and
used for calculations of x-ray and related spectra, including x-ray absorption
(XAS), x-ray emission (XES), inelastic x-ray scattering, and electron energy
loss spectra (EELS). The code is particularly useful for the analysis and
interpretation of the XAS fine-structure (EXAFS) and the near-edge structure
(XANES) in materials throughout the periodic table. Nevertheless, many
applications, such as non-equilibrium systems, and the analysis of ultra-fast
pump-probe experiments, require extensions of the code including
finite-temperature and auxiliary calculations of structure and vibrational
properties. To enable these extensions, we have developed in tandem, a new
version FEFF10, and new FEFF based workflows for the Corvus workflow manager,
which allow users to easily augment the capabilities of FEFF10 via auxiliary
codes. This coupling facilitates simplified input and automated calculations of
spectra based on advanced theoretical techniques. The approach is illustrated
with examples of high temperature behavior, vibrational properties, many-body
excitations in XAS, super-heavy materials, and fits of calculated spectra to
experiment.
