HIGH-RESOLUTION X-RAY ABSORPTION SPECTROMETRY OF ATOMIC VAPORS

Andrej Mihelič,^a Alojz Kodre,^b Iztok Arčon,^cand Jana Padežnik Gomilšek^d

^a Jožef Stefan Institute, Jamova 39, 1000 Ljubljana

^b Faculty of Mathematics and Physics, Jadranska 19, 1000 Ljubljana

Jožef Stefan Institute, Jamova 39, 1000 Ljubljana

^c Nova Gorica Polytechnic, Vipavska 13, 5000 Nova Gorica

Jožef Stefan Institute, Jamova 39, 1000 Ljubljana

^d Faculty of Mechanical Engineering, Smetanova 17, 2000 Maribor

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.

Key words: x-ray absorption, atomic vapors, K, Zn, Rb, Cd, Cs, EXAFS