L-series X-ray fluorescence cross section measurements for 72Hf employing synchrotron radiation

In the present work, the Hf target was irradiated by tuning the energy (Ep) of synchrotron radiation across the Li (i = 1-3) edge-energies ranging from 9.6 keV to 14.0 keV in order to measure the cross sections for production of the fluorescent Lk X-rays (k = l, alpha, eta, beta 1,6, beta 3, beta 4, beta 2,15, beta 5,7, beta 9,10, gamma 1,5, gamma 2,3,6,8, gamma 4). These measurements were performed with the aim to check the validity of independent particle approximation (IPA) models at incident photon energies in proximity to the Li absorption edges of a heavy transition element. The measured cross sections were compared with three sets of values calculated using the X-ray emission rates based on the DiracFock model, the Li (i = 1-3) sub-shell photoionization cross-sections based on the non-relativistic Hartree-FockSlater model and three sets of the fluorescence (omega i) and Coster-Kronig (fji) yields.