We have investigated the LIII absorption edges of 80Hg and 81Tl in the metals and their respective compounds. It is found that owing to chemical combination the LIII absorption edges of 80Hg and 81Tl are, in general, shifted towards the high-energy side. A white line at the absorption edge has been detected for HgO, TlBr and Tl(NO3)3.
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