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Journal articles

Academic literature on the topic 'Vibrational Raman Modes'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Vibrational Raman Modes"

1

Jumeau, Richard, Patrice Bourson, Michel Ferriol, François Lahure, Marc Ponçot, and Abdesselam Dahoun. "Identification of LDPE Grades Focusing on Specific CH2 Raman Vibration Modes." International Journal of Spectroscopy 2013 (April 15, 2013): 1–6. http://dx.doi.org/10.1155/2013/720598.

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The possibilities of applications of vibrational spectroscopy techniques (Raman spectroscopy) in the analysis and characterization of polymers are more and more used and accurate. In this paper, our purpose is to characterize Low Density Poly(Ethylene) (LDPE) grades by Raman spectroscopy and in particular with CH2 Raman vibration modes. With temperature measurements, we determine different amorphous and crystalline Raman assignments. From these results and on the basis of the evolution of CH2 bending Raman vibration modes, we develop a phenomenological model in correlation with Differential Sc

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2

Okamoto, Hiromi, Takakazu Nakabayashi, and Mitsuo Tasumi. "Picosecond Anti-Stokes Raman Excitation Profiles as a Method for Investigating Vibrationally Excited Transients." Laser Chemistry 19, no. 1-4 (1999): 335–41. http://dx.doi.org/10.1155/1999/21312.

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A method for estimating vibrational quantum numbers of vibrationally excited transients in solution is proposed. In this method, we calculate anti-Stokes Raman excitation profiles (REPs) which are characteristic of the initial vibrational states involved in the Raman process, and compare them with observed anti-Stokes intensities. We have applied this method to vibrationally hot molecules of canthaxanthin in the So state and those of trans-stilbene in the S1 state. For canthaxanthin, it has been found that the vibrationally excited transients are for the most part on the ν=1 level of the C═C s

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3

Fang, S. L., L. Grigorian, P. C. Eklund, et al. "Raman scattering from vibrational modes inSi46clathrates." Physical Review B 57, no. 13 (1998): 7686–93. http://dx.doi.org/10.1103/physrevb.57.7686.

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4

Shakoor, Abdul, Fayyaz Hussain, Najmul Hassan, Abdul Majid, Muhammad Tariq Bhatti, and Hassan Siddique. "A density functional theory study of Raman modes of cadmium hexathiohypodiphosphate (CdPS3)." Materials Science-Poland 33, no. 2 (2015): 286–91. http://dx.doi.org/10.1515/msp-2015-0041.

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AbstractRaman scattering investigations based on density functional theory (DFT) calculations were performed to explore the vibrational modes of a cadmium hexathiohypodiphosphate CdPS3 single crystal. The calculations were performed to obtain the Raman spectra for the cadmium hexathiohypodiphosphate atoms to study the size dependence. Several vibrational modes indicating stretching and bending features related to Cd, S and P atoms were observed. Modifications of the frequency and intensity of different Raman modes with an increase in the number of atoms in CdPS3 were discussed in detail. Hydro

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5

Islam, Md Mahfujul, та Fredric Datchi. "Polarized Raman Spectra of α Quartz". International Letters of Chemistry, Physics and Astronomy 56 (липень 2015): 91–98. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.56.91.

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The purpose of this experiment was to observe the Raman shift to assign the symmetry character of the obtained vibrational modes of α-quartz (which has 9 atom per unit cell) using the selection rules for Raman Effect. We observed the Raman spectra varying the polarization of the incoming beam and the orientation of the crystal. And we used monochromatic radiation of argon laser of wavelength 540 nm for our Raman spectroscopy. We observed the intensity of light rotating the polarizer to vertical position from its horizontal position with respect to the plane of the optical table where the laser

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6

Islam, Md Mahfujul, та Fredric Datchi. "Polarized Raman Spectra of α Quartz". International Letters of Chemistry, Physics and Astronomy 56 (21 липня 2015): 91–98. http://dx.doi.org/10.56431/p-k754hp.

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The purpose of this experiment was to observe the Raman shift to assign the symmetry character of the obtained vibrational modes of α-quartz (which has 9 atom per unit cell) using the selection rules for Raman Effect. We observed the Raman spectra varying the polarization of the incoming beam and the orientation of the crystal. And we used monochromatic radiation of argon laser of wavelength 540 nm for our Raman spectroscopy. We observed the intensity of light rotating the polarizer to vertical position from its horizontal position with respect to the plane of the optical table where the laser

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7

Nakabayashi, Takakazu, Hiromi Okamoto, and Mitsuo Tasumi. "Pump- And Probe-Wavelength Dependencies of Picosecond Anti-Stokes Raman Spectrum of Trans-Stilbene in the S1 State." Laser Chemistry 19, no. 1-4 (1999): 75–78. http://dx.doi.org/10.1155/1999/10475.

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Vibrational relaxation dynamics of trans-stilbene in the S1 state immediately after photoexcitation is studied by picosecond time-resolved anti-Stokes Raman spectroscopy with several pump and probe wavelengths. Pump-wavelength dependence of the anti- Stokes spectrum indicates that, when pump photons with high excess energy (≈5200cm-1) are used, the anti-Stokes Raman bands at 0 ps delay time arise from vibrationally excited transients with excess vibrational energy not thermally distributed in the molecule. Probe-wavelength dependence suggests that the vibrationally excited transients at 0 ps a

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8

Коrnienko, N. E., and O. L. Pavlenko. "Multiple Fermi Resonances in Liquid Benzene." Ukrainian Journal of Physics 65, no. 6 (2020): 480. http://dx.doi.org/10.15407/ujpe65.6.480.

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A number of coupled Fermi vibrational resonances (FRs) in liquid benzene from a multitude of them are systematically studied. The spectral structure of the vibrational bands in the IR absorption and Raman scattering spectra are determined by their numerical decomposition into individual components. The complication of vibrational resonances with an increase in their order is due to the overlapping of FRs and the appearance of additional resonant vibrational modes. To clarify the identification of the vibrations of the benzene FR v1+v6, v8 and the correction of the frequencies of a number of in

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9

Vaithianathan, V., R. Kesavamoorthy, C. V. Kannan, P. Santhanaraghavan, and P. Ramasamy. "Raman study of gaseous bubble inclusions in bismuth germanate and bismuth germanium silicon oxide single crystals." Journal of Materials Research 18, no. 4 (2003): 762–67. http://dx.doi.org/10.1557/jmr.2003.0105.

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Gaseous bubble inclusions in bismuth germanate (BGO) and bismuth germanium silicon oxide (BGSO) crystals were studied by means of Raman spectroscopy at room temperature. Their Raman spectra in the range from 60 to 70 cm−1 showed three peaks for the rotational Raman modes of O2 and N2. Vibrational Raman modes of O2 and N2 were also recorded for BGO and BGSO crystals. It was found that all the rotational and vibrational modes were blue shifted from those of free molecules due to the hydrostatic pressure in the bubbles. Internal pressure in the bubbles was estimated from the rotational and vibrat

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10

Srinivasan, S., and V. Renganayaki. "Computational Studies of Vibration Spectra and Thermodynamic Properties of Metformin Using HF, DFT Methods." Material Science Research India 8, no. 1 (2011): 165–72. http://dx.doi.org/10.13005/msri/080124.

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The molecular vibrations of metformin, one of the important anti-diabetic drugs to treat Non Insulin Dependent Diabetes Mellitus (NIDDM) have been investigated at room temperature by Fourier transform infrared (FTIR) and Fourier transform Raman (FTR) spectroscopies. The solid phase FTIR and FT-Raman spectra of the title compound have been recorded in the regions 4000-400 and 3500-250 cm-1. A satisfactory band assignment has been made on the fundamental modes of vibration. Employing the ab - initio Hatree –Fock (HF) and Density Function Theory (DFT) methods, the theoretical vibrational frequenc

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