Experimental and theoretical anisotropy studies for tungsten

An attempt has been made to study the angular distribution of L X-rays of tungsten (W-74) both theoretically and experimentally in the angular range 0°–120° at 10.676 keV i. e. at photon energy lying between L3 and L2 edges of W where maximum anisotropy is expected. The experimental measurements are performed in XRF laboratories of Raja Ramanna Center for Advanced Technology (RRCAT), Indore, India using a three-dimensional double reflection geometrical set-up. Theoretically, the value of alignment parameter A20 used for angular studies is calculated using non-relativistic dipole approximation in a point Coulomb potential. From the normalized angular L X-ray intensities (experimental and theoretical) for Lℓ and Lα peaks it has been observed that the experimental anisotropy is more as compared to the theoretical one, furthermore, the anisotropy for Lℓ is more in comparison to Lα peaks due to the unresolved Lα1 and Lα2 lines with opposite anisotropic parameters under both procedures.