DiscussionChemical shifts of L3 X-ray absorption edges on lead and thallium compounds by DEXAFS using synchrotron radiation source

The L3 absorption edges of 82Pb and 81Tl compounds have been measured using DEXAFS at INDUS-2 Synchrotron radiation source at RRCAT, Indore. The energy shift of ∼(−6 to 2) eV are observed in pre-edge of 82Pb compounds while energy shift varies ∼(−5 to 10) eV in pre-edge and ∼(2-9) eV in post-edge of 81Tl compounds. The chemical effects in both compounds have been described by calculating effective charge using Suchet and Pauling methods. A linear relation is established between chemical effect and effective charge of different compounds for the first time in literature.