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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been...
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Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Fluorescence and Phosphorescence: Instrumentation01:25

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Raman and Photoluminescence Spectroscopy with a Variable Spectral Resolution.

Ivan Pavić1, Joško Šoda1, Vlatko Gašparić2

  • 1Department for Marine Electrical Engineering and Information Technologies, Faculty of Maritime Studies, Ruđera Boškovića 37, 21000 Split, Croatia.

Sensors (Basel, Switzerland)
|December 10, 2021
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Summary
This summary is machine-generated.

This study introduces a novel zoom optics approach for Raman and photoluminescence (PL) spectroscopy, enhancing efficiency and spectral resolution. This method allows for faster acquisition and adaptable resolution for analyzing materials' vibrational and electronic properties.

Keywords:
Raman spectrometerphotoluminescencespectral resolutionzoom lens

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Optics

Background:

  • Raman and photoluminescence (PL) spectroscopy are crucial for analyzing material properties.
  • Traditional methods require fixed spectral resolution, limiting adaptability.
  • Optimizing spectral resolution is key for accurate characterization.

Purpose of the Study:

  • To develop a novel approach for Raman and PL spectroscopy using zoom optics.
  • To demonstrate variable spectral resolution for improved efficiency and data acquisition.
  • To enhance the adaptability of spectrometers for diverse material analysis.

Main Methods:

  • Utilized zoom optics integrated into a monochromator for variable spectral resolution.
  • Tested the system with varying zoom factors to adjust spectral intervals and resolution.
  • Compared performance on ZrO2, TiO2 nanocrystals (Raman) and Al2O3 (PL) against a commercial spectrometer.

Main Results:

  • Achieved variable spectral resolution, reducing acquisition time significantly.
  • Higher zoom factors provided enhanced resolution suitable for Raman spectra.
  • Lower zoom factors provided broader spectral coverage suitable for PL spectra.
  • Demonstrated simultaneous Raman and PL capabilities without grating changes.

Conclusions:

  • The zoom optics approach offers an efficient and fast method for identifying Raman and PL bands in unknown materials.
  • This adaptable spectrometer can precisely record spectral intervals at appropriate resolutions.
  • The technology presents a significant advancement for materials characterization and analysis.