IOSR-JAP   Volume-3 ~ Issue-6 ~ May–June 2013

Abstract: We report on the 130 MeV Ni ion irradiation induced modification of the surface roughness of DLC films grown by microwave plasma CVD method. The MWCVD system which was used to grow the DLC thin films was designed and developed in-house. The growth of thin films of DLC was studied with different substrate dc bias using Ar/H2 (2%) and Methane as feedstock. The deposited films were irradiated with 130 MeV Ni ion irradiation to doses of 3e11, 3e12 and 1e13 ions/cm2. Atomic force microscopy and Raman spectroscopy were used to study the 130 MeV Ni ion irradiation induced modification of surface topography and structure of the DLC films. Raman spectroscopy results of the deposited films show D and G bands at 1380 cm-1 and 1558 cm-1 characteristic of DLC films and indicate change in sp3 content with change in –dc bias. The Atomic force microscopy results show that the deposited DLC films have smooth surface and the RMS roughness decreased in the irradiated films relative to the pristine film which can be due to the electronic energy loss of 130 MeV Ni ions being lower than the energy loss threshold for track formation.

Key words : MWCVD, DLC, raman, direct dc bias, RMS surface roughness.

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Abstract: Single crystals of cadmium mercury tetrathiocyanate dimethylsulphoxide [CdHg(SCN)4(H6C2OS)2],CMTD was conveniently grown from a DMSO-water mixed solvent by slow evaporation technique. The good quality single crystal has been harvested in a period of 40-45 days. Different characterization studies have been carried out for finding its suitability in device fabrications. The lattice parameters of the crystal have been studied by single crystal X-ray diffraction analysis and the crystal system was identified as Orthorhombic. The Fourier transform infrared spectrum of CMTD has been recorded in the region 450-4000 cm-1 to identify the presence of functional groups. The optical studies have been carried out and it was found that the tendency of transmission observed from the specimen with respect to the wavelength of light is practically more suitable for opto-electronic applications. The photoconductivity studies confirm that the title compound has negative photoconducting nature. The relative second harmonic generation efficiency of the crystal has been tested by Kurtz-Perry powder technique.

Keywords: organometallic, non-linear optical crystals, characterization, synthesis, X-ray diffraction, dimethylsulphoxide

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Abstract: SITUS INVERSUS TOTALIS is a congenital positional anomaly characterized by transposition of abdominal viscera associated with a right sided heart (Dextrocardia) .It was Mathew Baillie who first described situs inversus totalis in early twentieth century. A transposed thoracic and abdominal organ is a mirror image of the normal anatomy when examined or visualized by tests such as x-ray filming. The term situs inversus is a short form of the Latin meaning inverted position of the internal organs. Generally individuals with situs inversus totalis are asymptomatic and have a normal life expectancy. Many people with situs inversus totalis are unaware of their unusual anatomy until they seek medical attention for an unrelated condition. The reversal of the organs may lead to some confusion as many signs and symptoms will be on the reverse side. A 27 years old male patient reported to the Department of Nephrology with the c/o left sided flank pain since 1 week. The Chest X-ray, Ultrasonography, CT scan and MRI were done and he was diagnosed as SITUS INVERSUS TOTALIS. The anatomic, pathologic, embryologic and etiology of complete Situs inversus and related abnormalities are presented in this case with special emphasis to genetic correlation.

Key words: Situs inversus totalis, Dextrocardia, Congenital, Transposition, Thoracic and abdominal organs.

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