Akkus, Tuba

The coherent to Compton scattering cross-section ratio of calcium was measured experimentally for several polar scattering angles (90° , 100° , 110° , 120° , and 130° ) and azimuthal scattering angles (30° , 20° , 10° , 0° ,-10° , and-20°). A high purity germanium semiconductor detector with a resolution of 199.6 eV at 5.9 keV was used. The theoretical values of the coherent to Compton scattering differential cross-section of calcium were calculated on the basis of nonrelativistic form factors, relativistic form factors, and S-matrix theories. It was observed that the experimental results were most compatible with the nonrelativistic form factor theory.

Astam, Aykut; Akaltun, Yunus; Yildirim, Muhammet

A copper sulfide thin film was deposited on glass substrate by successive ionic layer adsorption and reaction method at room temperature, using cupric sulfate and sodium sulfide aqueous solutions as precursors. The structural, surface morphological, optical, and electrical properties of the as-deposited film were investigated via X-ray diffraction, scanning electron microscopy, energy dispersive X-ray analysis, optical absorption, and d.c. 2-point probe methods. The film was found to be amorphous, dense, and uniform. Average atomic percentage of Cu:S in the as-deposited film was calculated as 63:37. The band gap energy of copper sulfide thin film was found to be 2.14 eV and the resistivity was 10-2ω cm at room temperature. The effect of annealing on crystal structure was also studied and reported. X-ray diffraction patterns revealed that annealing the film at various temperatures slightly improved the crystallinity. By using thermoelectric power measurement, p-type electrical conductivity was determined for as-deposited and annealed samples..