Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An Improved Laboratory-Based XAFS and XES Spectrometer for Analytical
  Applications in Materials Chemistry Research   X-ray absorption fine structure (XAFS) and x-ray emission spectroscopy (XES)
are advanced x-ray spectroscopies that impact a wide range of disciplines.
However, unlike the majority of other spectroscopic methods, XAFS and XES are
accompanied by an unusual access model, wherein; the dominant use of the
technique is for premier research studies at world-class facilities, i.e.,
synchrotron x-ray light sources. In this paper we report the design and
performance of an improved spectrometer XAFS and XES based on the general
conceptual design of Seidler, et al., Rev. Sci. Instrum. 2014. New developments
include reduced mechanical degrees of freedom, much-increased flux, and a wider
Bragg angle range to enable extended x-ray absorption fine structure (EXAFS)
for the first time with this type of modern laboratory XAFS configuration. This
instrument enables a new class of routine applications that are incompatible
with the mission and access model of the synchrotron light sources. To
illustrate this, we provide numerous examples of x-ray absorption near edge
structure (XANES), EXAFS, and XES results for a variety of problems and energy
ranges. Highlights include XAFS and XES measurements of battery electrode
materials, EXAFS of Ni and V with full modeling of results to validate
monochromator performance, valence-to-core XES for 3d transition metal
compounds, and uranium XANES and XES for different oxidation states. Taken en
masse, these results further support the growing perspective that modern
laboratory-based XAFS and XES have the potential to develop a new branch of
analytical chemistry.

32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph