<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">x-ray excited optical luminescence</topic></authority><related type="broader"><topic>x-ray spectroscopy</topic></related><variant type="other"><topic>XEOL</topic></variant> <note xml:lang="en"><![CDATA[ An X-ray spectroscopy technique, usually synchrotron-based, that provides information on the chemical state and short-range atomic order of the top few microns of a surface. It concerns the conversion of the X-ray energy absorbed by the system to optical photons often involving multi-step cascade processes. XEOL is often used together with XANES/NEXAFS to provide site specificity which in turn can help reveal the electronic structure and optical properties of the system of interest.  ]]></note></mads>