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1.
Thin films of zinc oxide (ZnO) were deposited on cleaned glass substrates by chemical spray pyrolysis technique using Zn(CH3COO)2 as precursor solution. Also, aluminium-doped thin films of ZnO were prepared by using AlCl3 as doping solution for aluminium. The dopant concentration [Al/Zn atomic percentage (at%)] was varied from 0 to 1.5 at% in
thin films of ZnO prepared in different depositions. Structural characterization of the deposited films was performed with
X-ray diffraction (XRD) studies. It confirmed that all the films were of zinc oxide having polycrystalline nature and possessing
typical hexagonal wurtzite structure with crystallite size varying between 100.7 and 268.6 nm. The films exhibited changes
in relative intensities and crystallite size with changes in the doping concentration of Al. The electrical studies established
that 1 at% of Al-doping was the optimum for enhancing electrical conduction in ZnO thin films and beyond that the distortion
caused in the lattice lowered the conductivity. The films also exhibited distinct changes in their optical properties at different
doping concentrations, including a blue shift and slight widening of bandgap with increasing Al dopant concentration. 相似文献
2.
Nirmal Kumar Sarkar Joydeep ChoudhurySrinivasa Rao Karumuri Ramendu Bhattacharjee 《Vibrational Spectroscopy》2011,56(1):99-104
Using the U(4) algebraic model, in this work we report a study of the vibrational spectra of SO2, H2018 and D2O16. The inclusion of intermode couplings in algebraic models has been stated to give a deep insight into detailed spectroscopy for these bent XY2 molecules. Improved set of algebraic parameters has been reported to provide improved RMS deviations for these molecules. 相似文献
3.
Srinivasa Rao Karumuri Joydeep Choudhury Nirmal Kumar Sarkar Ramendu Bhattacharjee 《Pramana》2010,74(1):57-66
Using Lie algebraic techniques and simpler expressions of the matrix elements of Majorana and Casimir operators given by us,
we obtain an effective Hamiltonian operator which conveniently describes stretching vibrations of biomolecules. For a copper
tetramesityl porphyrin molecule, the higher excited vibrational levels are calculated by applying the U(2) algebraic approach. 相似文献
4.
Srinivasa Rao Karumuri Joydeep Choudhury Nirmal Kumar Sarkar Bandana Gogoi Ramendu Bhattacharjee 《Indian Journal of Physics》2010,84(6):647-652
Porphyrins have received numerous considerable attentions during recent years because of their great biological importance.
The most interesting areas of current research in molecular spectroscopy are the study of the vibrational ground and excited
states of polyatomic molecules especially for the Metalloporphyrins. In this paper, we have calculated the fundamental and
extrapolated vibrational energy levels of Magnesium, Nickel, Copper, Zinc, Metalloporphyrin molecules using U (2) algebraic
model Hamiltonian. The results obtained by this method are in good agreement with the experimental data. This study gives
a general approach for solving the vibrational spectra of Metalloporphyrin molecules. 相似文献
5.
Nirmal Kumar Sarkar Joydeep Choudhury Srinivasa Rao Karumuri Ramendu Bhattacharjee 《Molecular physics》2013,111(5):693-702
Using the Lie algebraic method the vibrational energy levels of HCCF and HCCD are calculated for 102 and 110 vibrational bands, respectively, using the local Hamiltonian. A comparative study is made between the two. Better results are obtained than those published earlier from local mode analysis. 相似文献
6.
Vibrational Spectroscopy of Stretching and Bending Modes of Nickel Tetraphenyl Porphyrin: an Algebraic Approach 下载免费PDF全文
Srinivasa Rao KARUMURI Joydeep CHOUDHURY Nirmal Kumar SARKAR Ramendu BHATTACHARJEE 《中国物理快报》2009,(9):122-125
We calculate the vibrational frequencies of nickel tetraphenyl porphyrin for 36 vibrational bands by using the U(2) algebraic approach. The algebraic parameters in the calculations are accurate with the experimental data. 相似文献
7.
Srinivasa Rao Karumuri Nirmal Kumar Sarkar Ramendu Bhattacharjee 《Journal of Molecular Spectroscopy》2009,255(2):183-104
In this paper the highly excited stretching and bending vibrational energy levels of some Nickel Metalloporphyrin molecules are studied by U (2) algebraic model. Its application to Nickel Octaethyl Porphyrin, Nickel Tetra Phenyl Porphyrin and Nickel Porphyrin are presented with fewer algebraic fitting parameters. The highly excited stretching and bending vibrational energy levels of these molecules are showing the energy clustering spectrum. 相似文献
8.
Joydeep Choudhury Srinivasa Rao Karumuri Nirmal Kumar Sarkar Ramendu Bhattacharjee 《Pramana》2008,71(3):439-445
The stretching and bending vibrational energies of SnBr4 and CCl4 are calculated in the one-dimensional framework. The dynamical symmetry group of tetrahedral molecule was taken into consideration
to construct the model Hamiltonian in this framework. Casimir and Majorana invariant operators were also determined accordingly.
Using the model Hamiltonian so constructed, we reported the vibrational energy levels of SnBr4 and CCl4 molecules accurately.
相似文献
9.
Copper nanoparticles have been prepared through the chemical reduction of cuprous ions by ethanol. Freshly prepared colloidal solution shows an absorption band at about 296 nm. The particle size using Scherrer's equation is calculated to be about 12 nm. TEM showed nearly uniform distribution of the particles with an average size of 11 nm. Photoluminescence spectra of copper nanoparticles have also been analysed, which show an emission peak at 530 nm when illuminated at 350 nm. Electroluminescence spectra also give maximum emission at 550 nm. 相似文献
10.
Joydeep Choudhury Nirmal Kumar Sarkar Srinivasa Rao Karumuri Ramendu Bhattacharjee 《中国物理快报》2009,26(2):36-38
Using Hamiltonian based on Lie algebraic method, the stretching vibrational modes of C3H4 and C3D4 molecules are calculated up to higher overtones. The model appears to describe C-H and C-D stretching modes with less number of parameters. The locality parameter ξ confirms the highly local behaviour of the stretching modes of these molecules. 相似文献