## Introduction to XAFS: A Practical Guide to X-ray Absorption Fine Structure SpectroscopyX-ray absorption fine structure spectroscopy (XAFS) is a powerful and versatile technique for studying structures of materials in chemistry, physics, biology and other fields. This textbook is a comprehensive, practical guide to carrying out and interpreting XAFS experiments. Assuming only undergraduate-level physics and mathematics, the textbook is ideally suited for graduate students in physics and chemistry starting XAFS-based research. It contains concise executable example programs in Mathematica 7. Supplementary material available at www.cambridge.org/9780521767750 includes Mathematica code from the book, related Mathematica programs, and worked data analysis examples. The textbook addresses experiment, theory, and data analysis, but is not tied to specific data analysis programs or philosophies. This makes it accessible to a broad audience in the sciences, and a useful guide for researchers entering the subject. |

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### Contents

8 | |

Experimental | 36 |

Theory | 106 |

Data analysis | 134 |

Related techniques and conclusion | 189 |

Cumulants in EXAFS | 212 |

Optimizing Xray ﬁlters | 219 |

Reference spectra | 232 |

Xray tables | 241 |

251 | |

258 | |

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### Common terms and phrases

absorption coefﬁcient absorption edge ampliﬁer amplitude angular approximation atomic number background beamline bend magnet calculated central atom complex conﬁguration convolution theorem count rate cross section crystal cumulants deﬁned density dependence detector diffraction distance distribution effects elastically scattered electron element energy equation errors EXAFS example experimental factor ﬁll ﬁlter ﬁnal ﬁnd ﬁne ﬁnite ﬁrst ﬁt ﬁtting ﬂuorescence ﬂux Fourier transform frequency function incident integral inverse ionization chambers K-edge L-edges linear magnetic ﬁeld Mathematica matrix mean free path measured methods molecular orbital monochromator multiple scattering noise optics orbital oscillations parameters particles peaks phase photons polarization potential pre-edge programs pulse r-space ratio reﬂectivity sample scan scattering amplitude scattering paths shell shifts shown in Figure signal single scattering solid angle speciﬁc spectra spectrum spherical structure sufﬁciently symmetry synchrotron radiation theory thickness transition undulator vector voltage wave wavefunction width wigglers X-ray absorption X-ray beam XAFS XAFS experiments XANES zero