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Infrared Spectra of PH3 and NF_(3): An Algebraic Approach

Chinese Physics Letters 2013年第7期30卷 9-12页

作者： Joydeep Choudhury nirmal Kumar sarkar Ramendu Bhattacharjee Department of Physics Assam UniversitySilchar-788011India Department of Physics Karimganj CollegeKarimganj-788710India

Molecular spectroscopy is a branch of physics which deals with the interaction of electromagnetic radiation with *** the new theoretical approach,i.e.,Lie algebraic approach,we calculate the infrared spectra of phosphine in the range from 3000 cm^(-1) to 9500 cm^(-1) and nitrogen trifluoride in the range from 900 cm^(-1) to 4500 cm^(-1).The model Hamiltonian constructed seems to describe the P–H and N–F stretching modes accurately with only four numbers of *** present calculation not only predicts the higher overtones but also shows good agreement with the few observed data.

关键词： parameters. Infrared stretching

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Vibrational Spectroscopy of CH/CD Stretches in Propadiene： An Algebraic Approach

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Chinese Physics Letters 2009年第2期26卷 36-38页

作者： Joydeep Choudhury nirmal Kumar sarkar Srinivasa Rao Karumuri Ramendu Bhattacharjee Department of Physics Assam University Silchar- 788011 India Department of Physics Karimganj College Karimganj-788710 India

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.

关键词： No English Keywords

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Vibrational Spectroscopy of Stretching and Bending Modes of Nickel Tetraphenyl Porphyrin： an Algebraic Approach

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Chinese Physics Letters 2009年第9期26卷 122-125页

作者： Srinivasa Rao KARUMURI Joydeep CHOUDHURY nirmal Kumar sarkar Ramendu BHATTACHARJEE Department of Physics P.B. Siddhartha College of Arts and Sciences Vijayawada-520010 India Department of Physics Assam (a central) University Silchar- 788011 India Department of Physics Karimganj College Karimganj-788710 India

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... 详细信息

关键词： sea surface nonliear interaction numerical method

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Optimization and application of UVC irradiation for prevention of fungal biodeterioration of vegetable tanned and chrome tanned leather

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Journal of Leather Science and Engineering 2022年第2期4卷 380-393页

作者： Eshita Jhahan Subarna Bhattacharyya Anirban Chaudhuri nirmal sarkar Shaheen Akhtar Punarbasu Chaudhuri School of Environmental Studies Jadavpur UniversityKolkata 700032India Department of Environmental Science University of CalcuttaKolkataIndia.

UV-C irradiation critically effects the growth of micro-fungi and also deteriorate leather materials. In the present study vegetable tanned and chrome tanned leather were infected with pure cultures of Aspergillus niger and Aspergillus flavus, which were isolated from stored leather materials. UV-C light (λ = 254 nm) was applied on infected leather for 15 and 60 min. The changes in leather qualities were examined through weight, tensile strength, scanning electron microscope, energy dispersive X-ray and Fourier transform infrared spectroscopy study after 15 and 30 days of fungal inoculation. Vegetable tanned leather was more vulnerable in case of fungal attack than chrome tanned leather while A. flavus showed more influence on leather deterioration than A. niger. The results showed that weight loss after 30 days for 15 and 60 min irradiation exposure was 1.3% compared to A. flavus infected leather (3.93%). The tensile strength of vegetable and chrome tanned UV irradiated leather was increased by 44% and 7% respectively. The scanning electron microscopic images exhibit the limited presence of conidiophores in UV-C exposed leather which confirmed the potentiality of irradiation for controlling fungal growth. The infrared spectral analysis of UV-C exposed infected leather samples showed neither shifting of wavenumber nor displacement of any functional groups. Alto-gether the efficacy of UV-C irradiation against biodeterioration of leather was concluded to be effective. This method can be used to control fungal growth without compromising the leather quality.

关键词： Aspergillus Biodeterioration Leather SEM Tensile strength UV-C

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Overtone spectra of porphyrins and its substituted forms: an algebraic approach

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Journal of Biophysical Chemistry 2010年第2期1卷 119-132页

作者： Srinivasa Rao Karumuri A. S. R. Prasad nirmal Kumar sarkar Joydeep Choudhury Ramendu Bhattacharjee 不详

We introduce an algebraic model to vibrations of polyatomic Bio-molecules and present, as an example, the vibrational analysis of Cm-H, Cm-C, Cm-D, Cb-Cb, pyrrol breathing and Cb-C, stretching modes of Metalloporphyrins and its substituted forms. The excited energy levels of Cb-C, pyrrol breathing stretching modes of Ni(OEP) and Ni(OEP)-d4 are calculated by using U(2) algebraic mode Hamiltonian. The higher excited energy levels of Cm-H, Cm-C, Cm-D and Cb-Cb vibrational modes of Porphyrin and its substituted forms are predicted upto second overtone. It shows that the energy levels are clustering at the higher overtones. The results obtained by this method are accuracy with experimental data.

关键词： Algebraic Model Vibrational Spectra Energy Levels Metalloporphyrins

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