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1.
Vibrational Spectra of Distorted Structure Molecules by Using Lie Algebraic Techniques: an Application to Copper and Magnesium Octaethyl Porphyrin 下载免费PDF全文
Srinivasa Rao Karumuri 《中国物理快报》2010,27(10):80-83
Using a U (2) algebraic model the fundamental stretching vibrations of copper octaethyl porphyrin and magnesium octaethyl porphyrin are calculated for 24 vibrational bands. The locality parameter ξ confirms the highly local behavior of the stretching modes of these porphyrin molecules. The model Hamiltonian so constructed appears to describe the vibrational energy levels accurately. 相似文献
2.
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
3.
K Srinivasa Rao G Srinivas J. Vijayasekhar V. U. M. Rao Y. Srinivas K. Sunil Babu V. Sunndadara Siva Kumar A. Hanumaiah 《中国物理 B》2013,(9):225-232
In this paper, we have applied the Lie algebraic model to nano-bio molecules to determine the vibrational spectra of different stretching and bending vibrational modes. The determined vibrational energy levels by the Lie algebraic model are compared with the experimental data. The results from the theoretical mode[ are consistent with the experimental data. The vibrational energy levels are clustering in the excited states. 相似文献
4.
Vibrational spectra and intramolecular vibrational redistribution in methane and its isotopomers 下载免费PDF全文
An improved U(2) algebraic model is introduced to study the stretching and bending vibrational spectra of methane and its isotopomers.The algebraic model with fewer parameters reproduces the experimental spectra with good precision.Moreover,the obtained parameters describe well the correct behavior of isotopic substitution.It is shown that the Fermi resonance leads to a very fast intramolecular vibrational redistribution among stretches and bends. 相似文献
5.
CALCULATIONS OF STRETCHING VIBRATIONAL ENERGY LEVELS OF THE CH3I MOLECULE BY A NONLINEAR MODEL 下载免费PDF全文
A nonlinear model, i.e. the quantized discrete self-trapping equation, is applied to calculate the highly excited CH stretching vibrational energy levels of the CH3I molecule in the liquid phase at the electronic ground state up to n=8. The obtained results agree well with the experimental data and with those obtained from local mode model calculations. We note that the dominant feature of the methyl CH stretching vibrational energy levels of the CH3I molecule is a pattern of local mode pairs. When n≥7, all the vibrational energy of the CH3 group can nearly be localized on a single CH bond. 相似文献
6.
Three-dimensional ab initio dipole moment surfaces and stretching vibrational band intensities of the XH3 molecules 总被引:1,自引:0,他引:1 下载免费PDF全文
Stretching vibrational band intensities of XH3 (X=N, Sb) molecules are investigated employing three-dimensional dipole moment surfaces combined with the local mode Hamiltonian model.The dipole moment surfaces of NH3 and SbH3 are calculated with the density functional theory and at the correlated MP2 level,respectively. The calculated band intensities are in good agreement with the available experimental data. The contribution to the band intensities from the different terms in the polynomial expansion of the dipole moments of four group V hydrides (NH3, PH3,AsH3 and SbH3) are discussed. It is concluded that the breakdown of the bond dipole approximation must be considered. The intensity “borrowing” effect due to the wave function mixing among the stretching vibrational states is found to be less significant for the molecules that reach the local mode limit. 相似文献
7.
CALCULATIONS OF STRETCHING VIBRATIONAL OVERTONES AND COMBINATIONS OF ARSINE BY NONLINEAR MODEL 下载免费PDF全文
A three-parameter nonlinear model in nonlinear quantum theory,i.e.,the quantized discrete self trapping equation, has been used to calculate the vibrational energy spectrum, including the overtones and combinations with many excited quanta, of AsH stretches of arsine, AsH3. The model calculations agree well with experiment and other calculations. It is shown that the dominant feature of the energy spectrum of AsH3 molecule is a pattern of local mode pairs, and that when n≥4, all the vibrational energies are almost localized on a single AsH bond. 相似文献
8.
The highly excited vibrational levels of HCO in the electronic
ground state, \tilde {X}1A',are employed to determine the
coefficients of an algebraic Hamiltonian, by which the dynamical
potential is derived and shown to be very useful for interpreting
the intramolecular vibrational relaxation (IVR) which operates via
the HCO bending motion. The IVR inhibits the dissociation of H atom
and enhances the stochastic degree of dynamical character. This
approach is from a global viewpoint on a series of levels classified
by the polyad number which is a constant of motion in a certain
dynamical domain. In this way, the seemingly complicated level
structure shows very regular picture, dynamically. 相似文献
9.
The highly excited vibrational energy levels of SiH stretches of silane SiH4 in the electronic ground state are calculated using a three-parameter nonlinear model, i.e., the quantized discrete self-trapping equation. The obtained results are in good agreements with the experimental data and with those obtained from local mode calculations of others. We note that SiH4 molecule is a typical molecule close to the local mode limit, and that when n≥3, the molecule could be thought of as vibrating with the four SiH stretching quanta trapped into a single SiH bond. 相似文献
10.
In a unified algebraic scheme,we investigate the relation between the E(5) symmetry and the interacting boson model beyond the mean-field level.The results indicate that the E(5) symmetry is actually in between the critical point of the U(5)-O(6) transition and the O(6) limit but it is fairly close to the former based on the phase diagram of the interacting boson model at the large boson number limit.In addition,an algebraic Hamiltonian of the E(5)-β2n model is proposed. 相似文献