Appl. Phys. A55, 258-260 (1992) Apglioci Physics A "" 8u~ © Springer-Verlag 1992 A Note on X-Ray Raman Scattering from Boron D.K. Papademitriou and A.D. Zdetsis 1 Department of Physics, University of Ioannina, P.O. Box 1186, 45110 Ioannina, Greece 2 University of Patra, Department of Physics, Patra, Greece Received in revised form 16 March 1992/Accepted 27 March 1992 Abstract. A systematic study of the spectra of inelastically scattered X-ray radiation from Boron irradiated by Cu K~ radiation is presented. The results for the angular dependence of the intensity of Raman bands at lower scattering angles are in good agreement with the theoretical predictions. However, a clear discrepancy appears at higher scattering angles which is very different from the one which appears for other light elements (Lithium, Beryllium, Graphite). PACS: 78.70.Ck a discrepancy in the angular dependence of the intensity of Raman bands for high scattering angles. This fact lead us to a more systematic and detailed study of the integrated inten- sities of the Raman bands for a wide range of ~o. Therefore, in the present work using the Cu K;~ X-ray radiation of a copper tube and Boron as scatterer we studied the angular dependence of the intensity of X-ray Raman scattering at scattering angles qo from 35 ° to 110.0 ° in steps of 5 ° using a single crystal spectrometer with a resolution of about 1050. Our purpose is to resolve this important question mostly concerning the high qo values. In our previous work [1] a study was carried out on the spectra of inelastically scattered Cu K,~l,a 2 X-ray radiation by polycrystalline Be. In that work we studied the angular dependence of the intensity of X-ray Raman scattering at dif- ferent scattering angles. We confirmed that the dependence of the intensity upon the scattering angles qo at lower scat- tering angles is well predicted by the theoretical relationship [1], Itheor (3( (1 + cos 2 ~) sin 2 ~o/2. i This formula for the intensity had been theoretically deter- mined by Mizuno and Ohmura [2]. The main features of the experimentally determined curve I=aY, where Y = (1 + c0 s2 ~) sin 2 ~/2 and a = constant were: a) the linear dependence of Taman intensities as a function of Y at lower scattering angles in agreement with the theoretical predictions and b) a small deviation from linearity for scattering angles qo > 65.0 °. In a recent work [3] on the observation of the anomalous peaks at the long wavelength side of the Raman bands, the set of spectra for scattering angles ~ in the range from 45 ° to 105.0 ° in steps of 10°, were determined. They showed Experimental The experimental arrangement and procedure have been pre- viously described in detail [1]. The X-ray tube was operated at 55kV and 190mA and the used scatterer was Boron pow- der with a purity of 99.9%. AGe single crystal (220) ori- entation and 2d = 4.00A was used as an energy analyser because of higher intensity. The spectra were obtained using a scintillation counter by step-scanning. An automatic step- scanner of 0.01 ° was used and the time duration of each step was set to 400 s. The spectra were scanned 5 times in order to improve the statistical error which is estimated to be 1.5%. Results and Discussion The obtained X-ray spectra were taken at eleven different scattering angles qo from 35.0 ° to 110.0 ° as mentioned above. In Fig. 1 four of the observed X-ray spectra at scattering an- gles ~o of 45.0 °, 65.0 °, 85.0 °, and 105.0 ° are shown. By subtracting the Compton bands C from the experimentally obtained curves we succeeded to distinguish the X-ray Ra- man bands. This separation was successful for scattering an- gles qo higher than the critical scattering angle [4] so that the shape of a Compton band is a parabola. At the lower scatter- ing angles ~p, the separation of X-ray Raman scattering bands