Intensity Ratio of / in Selected Elements from Mg to Cu, and the Chemical Effects of Cr Diagram Lines and Cr / Intensity Ratio in Cr Compounds.

Kα,β X-ray lines from photon excitation were measured in selected elements from Mg to Cu using a high-resolution double-crystal X-ray spectrometer with a proportional counter, and the Kβ/Kα intensity ratio for each element was obtained, after correcting for self-absorption, detection efficiency, and crystal reflectance. This intensity ratio increases rapidly from Mg to Ca but, in the 3d elements region, the increase becomes slower. This is related to the intensity of the Kβ line involving valence electrons.

Pressure induced phase transition, electronic and optical properties of LiBeX (XAs, Sb and Bi).

In this contribution, we report the results of theoretical calculation on the pressure induced phase transitions, structural, electronic and optical properties of the lithium based ternary LiBeX (X = As, Sb, Bi) compounds. These calculations are carried out using the full potential linearized augmented plane wave method. Our results show that these compounds undergo first order phase transitions.

Malignant melanoma of ciliary body: a case report.

Ocular malignant melanomas are infrequently seen in Indian patents and most them involve the choroid. Ciliary body malignant melanoma is rather rare. This case report illustrates an occurrence in an Indian patient.