Raman spectroscopy.pptx
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This document provides an overview of Raman spectroscopy, including its principle, instrumentation, and applications. It begins with a brief history noting key milestones like the 1928 discovery by C.V. Raman which earned him the Nobel Prize. The principle section explains that monochromatic laser light interacts with a sample, with most light undergoing elastic Rayleigh scattering while a small amount undergoes inelastic Raman scattering. This provides information about molecular vibrations and structure. The instrumentation section notes the basic components needed to perform Raman spectroscopy. Finally, applications are discussed across various fields like chemistry, materials science, pharmaceuticals, and biology where it is used for qualitative and quantitative analysis.
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Raman spectroscopy (raman spectroscop\y)
This document discusses Raman spectroscopy. It begins with an introduction stating that Raman spectroscopy was discovered in 1928 and is used to observe vibrational and rotational modes in a system. It then covers the principles of Raman spectroscopy involving inelastic scattering of light. Instrumentation is described including lasers as light sources and spectrometers. Applications are provided for minerals, carbon materials, semiconductors and life sciences. Advantages are noted as being non-destructive and not interfered by water. Disadvantages include the technique being weak and requiring sensitive instrumentation.
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This document provides an overview of Raman spectroscopy, including:
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- An explanation of the principle behind Raman spectroscopy, which involves inelastic scattering of monochromatic light when it interacts with a sample, providing information about molecular structure.
- A description of the typical instrumentation used, including a laser light source, filter, sample holder, and detector such as a charge-coupled device (CCD).
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This document provides an introduction to Raman spectroscopy, including:
1. It discusses the history and development of Raman spectroscopy from its origins in the 1930s to its modern applications using lasers.
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Raman spectroscopy is an inelastic light scattering technique used to observe vibrational, rotational, and other low-frequency modes in a system. It relies on inelastic scattering, or Raman scattering, where molecules gain or lose small amounts of energy from a photon. This allows the measurement of the Raman spectrum, which can provide information about the chemical structure and bonds in molecules. The document discusses the history and discovery of the Raman effect, instrumentation, applications, and advanced Raman techniques such as resonance Raman scattering, surface-enhanced Raman spectroscopy, and electronic Raman scattering.
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This document provides an overview of Raman spectroscopy. It begins by defining spectroscopy as the study of how atoms and molecules interact with light. It then describes Raman scattering, which was discovered by C.V. Raman in 1928 and involves a change in frequency of scattered light that depends on the chemical structure of molecules. The rest of the document discusses key aspects of Raman spectroscopy such as Stokes and anti-Stokes scattering, the relationship between Raman and infrared spectroscopy, and applications of Raman spectroscopy such as molecular identification and quantification.
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This document discusses Raman spectroscopy. It begins with an introduction stating that Raman spectroscopy was discovered in 1928 and is used to observe vibrational and rotational modes in a system. It then covers the principles of Raman spectroscopy involving inelastic scattering of light. Instrumentation is described including lasers as light sources and spectrometers. Applications are provided for minerals, carbon materials, semiconductors and life sciences. Advantages are noted as being non-destructive and not interfered by water. Disadvantages include the technique being weak and requiring sensitive instrumentation.
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This document provides an overview of Raman spectroscopy, including:
- A brief history noting the discovery by Sir Chandrasekhara Venkata Raman in 1930 for which he received the Nobel Prize in Physics.
- An explanation of the principle behind Raman spectroscopy, which involves inelastic scattering of monochromatic light when it interacts with a sample, providing information about molecular structure.
- A description of the typical instrumentation used, including a laser light source, filter, sample holder, and detector such as a charge-coupled device (CCD).
- Applications of Raman spectroscopy in fields like chemistry, materials science, nanotechnology, biology, and medicine due to its non-destructive analysis of solids
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This document provides an introduction to Raman spectroscopy, including:
1. It discusses the history and development of Raman spectroscopy from its origins in the 1930s to its modern applications using lasers.
2. The theory section explains the underlying physics and quantum mechanics of Raman scattering, in which laser light interacts with molecular vibrations to produce unique spectral fingerprints.
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Raman spectroscopy is an inelastic light scattering technique used to observe vibrational, rotational, and other low-frequency modes in a system. It relies on inelastic scattering, or Raman scattering, where molecules gain or lose small amounts of energy from a photon. This allows the measurement of the Raman spectrum, which can provide information about the chemical structure and bonds in molecules. The document discusses the history and discovery of the Raman effect, instrumentation, applications, and advanced Raman techniques such as resonance Raman scattering, surface-enhanced Raman spectroscopy, and electronic Raman scattering.
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This document provides an overview of Raman spectroscopy. It begins by defining spectroscopy as the study of how atoms and molecules interact with light. It then describes Raman scattering, which was discovered by C.V. Raman in 1928 and involves a change in frequency of scattered light that depends on the chemical structure of molecules. The rest of the document discusses key aspects of Raman spectroscopy such as Stokes and anti-Stokes scattering, the relationship between Raman and infrared spectroscopy, and applications of Raman spectroscopy such as molecular identification and quantification.
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Raman spectroscopy analyzes samples by using laser light to excite molecular vibrations and interpreting the scattered light. When light interacts with molecules, most light scatters at the same wavelength, but a small amount scatters with slight wavelength changes. This inelastic scattering is called the Raman effect and provides information about molecular structure. Raman spectroscopy works by focusing a laser on a sample and collecting the inelastically scattered light with a spectrometer to produce a Raman spectrum unique to that material. It has many applications in fields like pharmaceuticals, geology, and life sciences because it is nondestructive and provides a molecular fingerprint to identify substances.
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Spectroscopy is a branch of science that deals with the interaction of matter and electromagnetic radiation. Some key types of spectroscopy described in the document are atomic spectroscopy, which analyzes the radiation absorbed and emitted by atoms to determine elemental composition. Infrared spectroscopy analyzes absorption in the infrared region to provide information about chemical structure. Raman spectroscopy is a non-destructive technique that provides detailed chemical information based on the interaction of light with chemical bonds. Spectroscopy has various applications including cure monitoring of composites, estimating weathered wood exposure times, measuring toxic compounds in blood, and non-destructive elemental analysis.
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Sir CV Raman was an Indian physicist who won the Nobel Prize in 1930 for his work on the Raman effect. He discovered that when light scatters from molecules, a small fraction of the light shifts to different wavelengths, which is now known as Raman scattering. Raman made many contributions in areas like X-ray diffraction, optics, and colloidal solutions. Raman spectroscopy uses the Raman effect to study materials by analyzing the scattering of monochromatic light. It provides a molecular fingerprint to identify compounds and detect molecular impurities. Both Raman and infrared spectroscopy are useful techniques to analyze materials, but Raman spectroscopy has advantages like avoiding interference from solvents and being able to detect IR-inactive modes.
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This document provides an overview of Raman spectroscopy. It discusses how Raman spectroscopy works, including that it involves scattering of monochromatic light when it interacts with molecular vibrations, resulting in a shift in wavelength. It describes the discovery of the Raman effect by C.V. Raman and how Raman spectroscopy has advantages over infrared spectroscopy such as not being interfered with by water. The document also outlines the instrumentation used in Raman spectroscopy and applications such as analyzing inorganic and organic species.
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This document provides an overview of Raman spectroscopy. It begins with a brief history noting its discovery in 1928 by Raman for which he later won a Nobel Prize. It then covers the basic principles of Raman spectroscopy including the Raman effect, Stokes and anti-Stokes scattering. Instrumentation components like lasers, filters, and detectors are described. Different types of samples that can be analyzed including solids, liquids, and gases are mentioned. Finally, applications of Raman spectroscopy in various fields like chemistry, polymers, mixtures, inorganic/organic species, and biology are highlighted.
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Raman spectroscopy is a technique used for characterization and qualitative/quantitative analysis of research products. It provides a molecular fingerprint that can be used to identify samples. Raman spectroscopy is non-destructive and can be used to investigate artworks by identifying individual pigments and degradation products to learn about an artist's working methods. It also finds medical applications by allowing real-time monitoring of anesthetic and respiratory gas mixtures during surgery. The technique provides information on a sample's molecular structure, composition, and crystal orientation.
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This document provides an overview of Raman spectroscopy. It discusses the principle behind Raman spectroscopy, which involves scattering of monochromatic light when it interacts with a sample. It describes the typical instrumentation used, including lasers as the light source and spectrometers to analyze the scattered light. The key differences between Raman and IR spectroscopy are outlined. Various types of Raman techniques and applications are also summarized, such as its use in analyzing inorganic, organic and biological samples.
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This document provides an overview of Raman spectroscopy. It begins with an introduction, explaining that Raman spectroscopy involves measuring the wavelength and intensity of inelastically scattered light from molecules. This scattered light occurs at shifted wavelengths corresponding to molecular vibrations.
It then provides a brief history of Raman spectroscopy and its development. The document outlines some key aspects of Raman spectroscopy, including that it is a vibrational spectroscopy that is complementary to infrared spectroscopy. Raman spectroscopy can be used to study samples with minimal preparation across various physical states.
The remainder of the document discusses various technical aspects of Raman spectroscopy in more detail, including classical theories, instrumentation components like lasers and filters, and conditions required for Raman scattering to occur. It provides examples
Field Ion - Infrared- Raman Spectroscopy
Field ion microscopy uses a high electric field to ionize gas atoms on the tip of a sample, which are then detected to create an atomic-scale image of the sample surface. Infrared spectroscopy analyzes the absorption of infrared light by molecules to determine their structure. Raman spectroscopy analyzes the inelastic scattering of monochromatic light when it interacts with molecular vibrations, rotations, and other low frequency modes to provide molecular fingerprint information. Both techniques produce spectra that can be used to identify chemicals based on the frequencies of molecular vibrations they produce.
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Raman spectroscopy uses laser light to study vibrational and rotational modes in molecules. When light interacts with molecules, the light may be scattered at different wavelengths than the incident laser, providing information about the molecule's structure and bonds. Raman spectroscopy has advantages over infrared spectroscopy in that it can be used to study samples in liquid or solid form, including aqueous solutions. It finds applications in elucidating molecular structure, biological analysis, and quantitative and qualitative analysis of materials.
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2. Different types of molecular vibrations like stretching and bending occur at characteristic frequencies that can identify functional groups and molecular structure.
3. The document discusses various spectroscopic techniques like fluorescence, X-ray, UV-Vis, IR, Raman, and NMR spectroscopy and their applications in chemistry.
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- 1. RAMAN SPECTROSCOPY Presented by Md Ariful Islam M. Pharm 2nd Semester Department of Pharmaceutical Sciences Dibrugarh University Advanced Spectral Analysis(MPC 201T) Principle, instrumentation and applications
- 2. CONTENT Introduction Principle of Raman Spectroscopy Instrumentation Applications Summary References
- 3. INTRODUCTION Milestones of Raman spectroscopy • 1923 : Inelastic light scattering predicted by A. Smekal • 1928 : C.V. Raman and K.S. Krishnan see "secondary radiation" from neat solvents (Nobel Prize 1930) • 1960 : Invention of laser - Breakthrough for Raman experiments 3
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- 6. 6 Interaction of light with a sample Laser light (monochromatic) interacts with sample Laser light can be: • Absorbed • Transmitted • Scattered • →Elastic scattering / Rayleigh (green) • →Inelastic scattering / Raman (red and blue
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- 22. SUMMARY 22 • Raman spectroscopy analyzes the interaction of light with matter to gather information about molecular structure and composition. • It is based on the Raman scattering phenomenon discovered by Sir C.V. Raman. • Monochromatic light is directed onto a sample, and the scattered light is analyzed. • The majority of scattered light undergoes elastic scattering (Rayleigh scattering), while a small fraction undergoes inelastic scattering (Raman effect). • Inelastic scattering occurs due to interactions with molecular vibrations and rotations. • The energy shifts in the scattered light provide insights into the chemical bonds, molecular structure, and composition of the sample. • A Raman spectrum is obtained by analyzing the energy shifts in the scattered light. • Raman spectroscopy is widely used in chemistry, materials science, pharmaceuticals, forensics, and biology for qualitative and quantitative analysis.
- 23. 23 "The Raman effect has opened up new vistas in the field of molecular spectroscopy, providing an invaluable tool for the study of molecular structure and dynamics." Quotes
- 24. REFERENCES 24 1. C.V. Raman & K. S. Krishnan, A New Type of Secondary Radiation, Nature 121, 501- 502 (1928) 2. Smith & G. Dent, Modern Raman Spectroscopy: A Practical Approach 1st ed. , Wiley (2005
- 25. THANK YOU