What is Raman mode in phonon dispersion curves?
Best insight from top research papers
Raman mode in phonon dispersion curves refers to the specific vibrational modes of a material that can be probed using Raman spectroscopy. Raman spectroscopy is a technique used to study the vibrational and rotational modes of molecules and materials by measuring the scattering of light. In the context of the provided abstracts, several papers discuss the Raman signature and phonon dispersion of different materials. For example, Cai et al. and Grüneis et al. investigate the Raman signature and phonon dispersion of atomically thin boron nitride (BN) and two-dimensional graphite, respectively. These studies use experimental and simulation techniques to reveal the intrinsic Raman signature and phonon dispersion of these materials. The phonon dispersion curves obtained from Raman spectroscopy provide valuable information about the vibrational properties and lattice dynamics of the materials under investigation.
Answers from top 3 papers
More filters
| Papers (3) | Insight |
|---|---|
102 Citations | The paper does not provide a direct explanation of what a Raman mode is in phonon dispersion curves. |
6 Citations | The paper does not provide information about Raman modes in phonon dispersion curves. |
| The paper does not provide a direct explanation of the Raman mode in phonon dispersion curves. |
Related Questions
How do Raman spectroscopy techniques differ from other spectroscopic methods for analyzing materials?5 answersRaman spectroscopy techniques differ from other spectroscopic methods for analyzing materials in several ways. Firstly, Raman spectroscopy is a label-free and non-invasive method that can provide molecular fingerprints of materials. This makes it highly specific and suitable for in situ characterization of various materials, including biomaterials. Secondly, Raman spectroscopy is least destructive and sensitive, making it ideal for analyzing contaminants and pesticides in food. It can provide wide analysis of food samples and is easy to operate. Thirdly, Raman spectroscopy is a rapid and non-destructive technique for identifying the number of layers/thickness of 2D materials. It can also provide detailed information about the chemical structure, phase, crystallinity, and molecular interactions of materials. Lastly, Raman spectroscopy has demonstrated unique capabilities in the analysis of meat quality, providing information about protein structure, fatty acid composition, and organoleptic parameters. It is comparability with traditional analytical methods and can be used directly in production. Additionally, Raman spectroscopy is valuable for characterizing textile materials, especially after modification and functionalization with nanoparticles. It can be used in conjunction with other techniques like FTIR for fiber identification and analysis.
What are the effects of yeast cells on Raman spectra?4 answersYeast cells have various effects on Raman spectra. Laser tweezers Raman spectroscopy (LTRS) was used to analyze the Raman spectra of yeast cell mitochondria. The spectral peaks of nucleic acids, proteins, lipids, cytochrome c, and mitochondria respiration were significantly decreased when yeast cells were induced with acetic acid, indicating the impact of acetic acid on mitochondria and the subsequent apoptosis of yeast cells. The metabolic activity of living yeast cells can be reflected by a mitochondrial Raman band at 1602 cm^-1, which shifts with isotope substitutions. Raman spectroscopy can also monitor changes in the Raman spectra of yeast cells under different stress conditions, such as hyperosmotic stress and growth phases, providing insights into cellular adaptation and growth. Micro-Raman analysis combined with hierarchical cluster analysis allows for the identification of yeast cells at a single-cell level, overcoming the challenges posed by their molecular compartmentalization. Raman microspectroscopy can be used to study the eutectic crystallization around yeast cells during freezing, providing information about cell injury and spatial distribution of crystallized compounds.
Raman spectra use for what?5 answersRaman spectroscopy is used for a variety of purposes. It can provide insight into the molecular composition of cells and tissue, making it a powerful diagnostic tool for identifying changes in molecular contents with the onset of disease. Raman spectroscopy is also used in battery research, allowing for non-destructive and sensitive detection properties. In the field of plant biology, Raman spectroscopy can be utilized for diagnostics of plant stresses, identification of plant species and varieties, and assessment of nutritional content and commercial values of seeds. Additionally, Raman spectroscopy is widely used in various fields such as petrochemical, material, food, biological, and medical research. It is particularly useful for analyzing the structure of proteins within complex biosystems, providing specific signatures and insights into protein determination.
What is Raman?1 answersRaman is a nondestructive analytical technique that allows the study of light diffused by samples being analyzed. It is used for the forensic examination of physical evidence, such as contraband drugs, fibres, paints, and explosive particles, among others. Raman spectroscopy is based on the Raman effect, which occurs when polarized laser light is scattered by a molecular sample. It is widely used in chemical analysis for the identification and characterization of molecules in solution, biomolecules, and solids. Raman microspectrometry is a specific application of Raman spectroscopy that provides high spatial resolution and allows the identification of pigments, corrosion products, and other substances in various samples, including mural paintings and illuminated manuscripts. Raman spectroscopic devices consist of optical resonators with reflecting bodies and transparent bodies, which generate Raman scattering and collect Raman-scattered light for analysis.
Can Raman spectra be used to differentiate yeast?5 answersRaman spectroscopy can be used to differentiate yeast species based on their unique spectral features. Different approaches have been explored to achieve this. One approach is to use surface-enhanced Raman spectroscopy (SERS) combined with silver nanoparticles, which allows for highly enhanced and reproducible Raman signals that can differentiate closely related fungal species. Another approach is to use meso-Raman spectroscopy, where thin films of yeast cells are analyzed to obtain averaged Raman signals, enabling the differentiation of yeast species. Additionally, average Raman spectra of single yeast cells can be used for classification with the help of support vector machines, allowing for the identification of yeast species without the need for cultivation. Overall, Raman spectroscopy shows promise as a rapid and accurate method for differentiating yeast species.
How is Raman spectroscopy visualised?5 answersRaman spectroscopy is visualized using a high speed optical chopper to reduce background fluorescence signal and provide a synchronized time-gated optical window for receiving mostly Raman signal while rejecting most or some of the fluorescence signal. The technique allows for Raman analysis of highly radioactive samples by sealing the sample in an alpha-tight capsule and performing Raman measurements through an optical-grade quartz window. In the case of ferecrystal thin films, Raman spectra can be described as a superposition of spectra from the individual components, indicating weak interaction at the interface between the components. Raman microscopy offers a unique approach to follow interactions and reactions inside a single crystal under soak-in or soak-out conditions, providing stable spectra with low background for Raman difference spectroscopy. Raman spectroscopy is also used for the advanced characterization of thin films for solar cells, allowing for the analysis of crystalline structure, chemical composition, and identification of secondary phases.