{ "cells": [ { "cell_type": "markdown", "id": "6a63bd76", "metadata": {}, "source": [ "This example shows a basic example of \"Feff fitting\" with larch for Cu metal at room temperature.\n", "\n", "We start with some import statements, then do a \"normal\" first-shell fit\n", " 1. read in data for Cu metal, Cu K edge\n", " 2. do background subtraction and plot $\\chi(k)$\n", " 3. set the Fourier transform ranges\n", " 4. define a Group of Parameters for the fit\n", " 5. read in 1 Feff Path for Cu-Cu scattering\n", " 6. run the fit and view the results\n", " \n", "Then we will expand that to include 2 more paths, and show one way to constrain the distances parameters" ] }, { "cell_type": "code", "execution_count": 1, "id": "59499dc6", "metadata": {}, "outputs": [], "source": [ "# step 0: imports\n", "import numpy as np\n", "from pathlib import Path\n", "from larch.xafs import (pre_edge, autobk, xftf, xftr,\n", " ff2chi, feffpath, feffit_transform, \n", " feffit_dataset, feffit, feffit_report)\n", "from larch.fitting import param, guess, param_group\n", "from larch.io import read_ascii\n", "from larch.plot.plotly_xafsplots import (plot_mu,plot_chik, plot_chir, plot_chifit, \n", " multi_plot, plotlabels, set_label_weight)" ] }, { "cell_type": "code", "execution_count": 2, "id": "c431a710", "metadata": {}, "outputs": [ { "data": { "text/html": [ " \n", " " ] }, "metadata": {}, "output_type": "display_data" }, { "data": { "application/vnd.plotly.v1+json": { "config": { "plotlyServerURL": "https://plot.ly" }, "data": [ { "line": { "color": "#1f77b4", "width": 3 }, "name": "mu", "type": "scatter", "uid": "b4bba9bd-51ae-4ce8-870f-7a78a7185ddd", "x": [ 8779, 8789, 8799, 8809, 8819, 8829, 8839, 8849, 8859, 8869, 8879, 8889, 8899, 8909, 8919, 8929, 8939, 8949, 8959, 8959.5, 8960, 8960.5, 8961, 8961.5, 8962, 8962.5, 8963, 8963.5, 8964, 8964.5, 8965, 8965.5, 8966, 8966.5, 8967, 8967.5, 8968, 8968.5, 8969, 8969.5, 8970, 8970.5, 8971, 8971.5, 8972, 8972.5, 8973, 8973.5, 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