PACS 71.15.Nc, 78.70.Ck First high-precision measurement of the isotropic Compton spectra of thulium has been carried out, at an intermediate resolution of 0.40 a.u., using 137 Cs as a γ-ray source. For the interpretation of data, theoretical calculations were undertaken using renormalised-free-atom (RFA) and free electron models. It is seen that the RFA calculation with e --e -correlation gives a better agreement with the experiment. From our experimental and theoretical Compton profile data, we have also computed for the first time the cohesive energy of thulium and compared it with available data.
We present the experimental Compton profile of polycrystalline terbium, using 661.65 keV gamma-rays, emitted by 20 Ci137Cs. In the absence of band structure calculations, theoretical computations have been made using renormalised-free-atom (RFA) and free electron based profiles. It is seen that the RFA results with e−-e− correlation correction agree relatively better with the experiment. The data are interpreted in terms of spd-f hybridization in the valence state of terbium. From the RFA profile, we have also derived the cohesive energy of terbium, which is compared with other band structures and experimental investigations. - PACs Nos. 13.60.F, 71.15.Nc, 78.70. -g, 78.70.Ck
The isotropic Compton profile of europium, the most reactive lanthanide, has been measured at a resolution of 0.40 a.u. using 661.65 keV gamma-rays. In the absence of a band structure-based Compton profile, the experimental data are compared with renormalised-free-atom (RFA) and free electron models. It is seen that the RFA model with e−-e− correlation agrees better with the experiment than the free electron models. The first derivatives of the Compton profiles show the hybridization effects of s-, p-, d-, f-electrons. From our RFA data we have also computed the cohesive energy of europium. PACS: 13.60.F, 71.15.Nc, 78.70. -g, 78.70.Ck
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