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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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UV–Vis Spectrometers01:14

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Raman Spectroscopy: Overview01:20

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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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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Solid State Vanadate Laser and 213 nm Rayleigh Rejection Filter Enable Miniaturized Deep Ultraviolet Raman

Sergei V Bykov1, Sanford A Asher1

  • 1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.

Applied Spectroscopy
|September 26, 2024
PubMed
Summary

Portable deep ultraviolet (UV) Raman spectrometers are now possible using a compact laser and Rayleigh rejection filter (RRF). This technology allows for high signal-to-noise ratio measurements and sensitive detection of trace compounds like ammonia.

Keywords:
213 nm Rayleigh rejection filter213 nm laserPortable Raman spectrometerRaman trace detectionUV resonance Ramanammoniaammonium nitratedeep ultraviolet longpass filter

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Area of Science:

  • Spectroscopy
  • Optics
  • Materials Science

Background:

  • Deep ultraviolet (UV) Raman spectroscopy offers unique advantages for chemical analysis.
  • Miniaturization of UV Raman systems is crucial for field applications.
  • Efficient Rayleigh rejection filters (RRFs) are essential for high-quality UV Raman measurements.

Purpose of the Study:

  • To demonstrate a portable deep UV Raman spectrometer system.
  • To showcase the performance of a novel 213 nm Rayleigh rejection filter (RRF).
  • To analyze UV Raman and UV resonance Raman (UVRR) spectra of specific materials.

Main Methods:

  • Development and integration of a miniaturized 213 nm neodymium-doped vanadate laser.
  • Utilization of a highly efficient 213 nm RRF for spectral measurements.
  • Acquisition of UV Raman spectra of Teflon and UVRR spectra of ammonium nitrate.

Main Results:

  • Demonstrated high efficiency of the 213 nm RRF.
  • Achieved high signal-to-noise ratio UV Raman spectra.
  • Successfully detected trace ammonia generated from ammonium nitrate photolysis with a detection limit of approximately 10 ng.

Conclusions:

  • The combination of a compact 213 nm laser and efficient RRF enables portable deep UV Raman spectroscopy.
  • The system is capable of sensitive detection of trace analytes, such as ammonia.
  • This technology holds promise for in-situ chemical analysis in various environments.