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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

UV–Vis Spectrometers

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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 and Visible (UV–Vis) Spectroscopy: Overview01:02

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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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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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A Multimodal Wide-Field Fourier-Transform Raman Microscope

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A compact Raman converter for UV-VIS spectrometers.

Patrick J Bisson1, James E Whitten1

  • 1Department of Chemistry, University of Massachusetts Lowell, Lowell, Massachusetts 01854, USA.

The Review of Scientific Instruments
|June 1, 2015
PubMed
Summary

A novel, compact Raman spectrometer converter is presented, enabling right-angle scattering measurements. This instrument utilizes a 405 nm laser and polarizing prisms for depolarization ratio analysis, enhancing Raman spectroscopy capabilities.

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Area of Science:

  • Spectroscopy
  • Optical Instrumentation
  • Materials Science

Background:

  • Raman spectroscopy is a powerful technique for material analysis.
  • Adapting existing spectrometers for specific configurations like right-angle scattering can be challenging.
  • The wavelength dependence of Raman scattering offers opportunities for enhanced sensitivity.

Purpose of the Study:

  • To describe the design and construction of a compact converter for right-angle scattering Raman spectroscopy.
  • To demonstrate the instrument's capability in measuring depolarization ratios.
  • To showcase the flexibility of adapting fiber-coupled spectrometers.

Main Methods:

  • Development of a small form factor, easily constructed converter.
  • Integration of a blue-violet (405 nm) diode laser for Raman excitation.
  • Inclusion of Glan-Thompson polarizing prisms for depolarization ratio measurements.
  • Utilizing a fiber optic link for spectrometer compatibility.

Main Results:

  • Successful adaptation of a fiber-coupled UV/VIS CCD detector-based spectrometer into a right-angle scattering Raman spectrometer.
  • Measurement of the depolarization ratio of carbon tetrachloride as a validation.
  • Demonstration of the instrument's ability to perform standard Raman spectroscopy.

Conclusions:

  • The developed converter offers a flexible and effective solution for right-angle scattering Raman spectroscopy.
  • The use of a 405 nm laser capitalizes on the inverse fourth power wavelength dependence for improved scattering.
  • The instrument's design facilitates adaptation to various spectrometer systems, broadening its applicability.