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.. _scipy: https://scipy.org/ .. _numpy: https://numpy.scipy.org/ .. _matplotlib: https://matplotlib.org/ .. _h5py: https://code.google.com/p/h5py/ .. _Demeter: https://bruceravel.github.io/demeter/
Larch is an open-source library and set of applications for processing and analyzing X-ray absorption and fluorescence spectroscopy data and X-ray fluorescence and diffraction image data from synchrotron beamlines. It is especially focussed on X-ray absorption fine-structure spectroscopy (XAFS) including X-ray absorption near-edge spectroscopy (XANES) and extended X-ray absorption fine-structure spectroscopy (EXAFS). It also supports visualization and analysis tools for X-ray fluorescence (XRF) spectra and XRF and X-ray diffraction (XRD) images as collected at scanning X-ray microprobe beamlines.
Larch is written in Python, making heavy use of the excellent scientific
python libraries (numpy, scipy, h5py, matplotlib, and many
more). Larch can be used as a Python library for processing and analyzing
X-ray spectroscopy and imaging data. In addition, the applications built
with it also use a built-in Python-like macro language for interactive and
batch processing. This embedded "miniPython" language is intended to be very
easy to use for novices while also being complete enough to automate data
processing and analysis and to encourage and facilitate a gentle transition
to transition from GUI-only analyses to scripted and programmatic analysis
of larger data sets, and allows Larch to be run as a
service, interacting with other processes or languages via XML-RPC, and so
be used by the popular Demeter_ XAFS application suite.
Larch is distributed under an open-source license that is nearly identical to the BSD license. It is under active and open development centered at the GeoScoilEnviroCARS sector of the Center for Advanced Radiation Sources at the University of Chicago has been supported by the US National Science Foundation - Earth Sciences (EAR-1128799), and Department of Energy GeoSciences (DE-FG02-94ER14466). In addition, funding specifically for Larch was granted by the National Science Foundation - Advanced CyberInfrastructure (ACI-1450468).
The best citable reference for Larch is M. Newville, Larch: An Analysis Package For XAFS And Related Spectroscopies. Journal of Physics: Conference Series, 430:012007 (2013).
These applications installed with Larch, in addition to a basic Python
library. Here, GUI = Graphical User Interface, CLI = Command Line
Interface, and beta indicates a work in progress.
+-------------------+------------+---------------------------------------------------------+
| Application Name | GUI/CLI | Description |
+===================+============+=========================================================+
| larch | CLI | simple shell command-line interface |
+-------------------+------------+---------------------------------------------------------+
| Larch GUI | GUI | enhanced command-line interface with data browser |
+-------------------+------------+---------------------------------------------------------+
| Larix | GUI | XAFS Processing and Analysis: XANES pre-edge peak |
| (was XAS Viewer) | | fitting, linear analysis, PCA/LASSO, EXAFS processing, |
| | | Running Feff, fitting EXAFS data to Feff paths. |
+-------------------+------------+---------------------------------------------------------+
| GSE Map Viewer | GUI | XRF Map Viewer for GSECARS X-ray microprobe data. |
+-------------------+------------+---------------------------------------------------------+
| larch_xrf | GUI | Display and analyze XRF Spectra. |
+-------------------+------------+---------------------------------------------------------+
| larch_xrd1d | GUI | Display and work with 1-D XRD patterns, integrate XRD |
| | | images, search for XRD patterns of known structures |
+-------------------+------------+---------------------------------------------------------+
| feff6l | CLI | Feff 6 EXAFS calculations |
+-------------------+------------+---------------------------------------------------------+
| feff8l | CLI | Feff 8 EXAFS calculations (no XANES) |
+-------------------+------------+---------------------------------------------------------+
| qtrixs | GUI beta | Display RIXS planes, take profiles |
+-------------------+------------+---------------------------------------------------------+
FAQs
Synchrotron X-ray data analysis in python
We found that xraylarch demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 1 open source maintainer collaborating on the project.
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