High-resolution X-ray absorption spectrometry of atomic vapors

Abstract

A measurement of an x-ray absorption spectrum of a monatomic sample yields pure atomic absorption essential for the EXAFS (Extended X-ray Absorption Fine Structure) analysis in cases of a weak structural signal. A construction of an absorption cell to contain vapor sample takes into account specific properties of the investigated element. Metal-vapor absorption cells for the elements K, Zn, Rb, Cd, Cs, and Hg are presented and comments are made on the use of materials and the operating mechanisms of the cells.Z meritvijo rentgenskega absorpcijskega spektra enoatomnega vzorca dobimo atomsko absorpcijo, ki je nujna za analizo EXAFS (Extended X-ray Absorption Fine Structure - podaljšana drobna struktura rentgenskih absorpcijskih robov), kadar je strukturni signal šibek. Izdelava absorpcijske celice, v kateri hranimo uparjeni vzorec, je odvisna od lastnosti preiskovanega elementa. V prispevku so predstavljene absorpcijske celice za kovinske pare K, Zn, Cd, Rb, Cs in Hg, posebna pozornost pa je namenjena delovanju celic in materialom, ki so bili uporabljeni pri njihovi izdelavi

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