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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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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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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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IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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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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A Monolithic Spatial Heterodyne Raman Spectrometer: Initial Tests.

Abigail Waldron1, Ashley Allen1, Arelis Colón1

  • 1Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, USA.

Applied Spectroscopy
|June 5, 2020
PubMed
Summary
This summary is machine-generated.

A new monolithic spatial heterodyne Raman spectrometer (mSHRS) offers a compact, stable, and robust design for high-resolution Raman spectroscopy. This innovation enhances portability for applications like planetary exploration.

Keywords:
Monolithic Raman spectrometerRamanSHRSSHSmSHRSmonolithic SHRSremote Ramanspatial heterodyne Raman spectrometerspatial heterodyne spectrometer

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Area of Science:

  • Spectroscopy
  • Optical Engineering
  • Planetary Science Instrumentation

Background:

  • Spatial Heterodyne Spectroscopy (SHS) provides high spectral resolution and throughput in a compact form factor.
  • Previous work developed benchtop SHS for space applications, requiring robust and miniaturized designs.
  • Monolithic construction techniques offer enhanced stability and reduced size for optical instruments.

Purpose of the Study:

  • To describe the development and characterization of a monolithic spatial heterodyne Raman spectrometer (mSHRS).
  • To evaluate the performance of mSHRS in terms of stability, spectral resolution, range, and signal-to-noise ratio.
  • To compare the mSHRS performance against traditional benchtop SHRS and a commercial Raman spectrometer.

Main Methods:

  • Fabrication of two monolithic SHS (mSHS) devices with different Littrow wavelengths (531.6 nm and 541.05 nm).
  • Integration of mSHS into a Raman spectrometer system utilizing a standard 1024-element CCD.
  • Performance testing including stability, spectral resolution (4-5 cm⁻¹ and 8-9 cm⁻¹), spectral range (~3500 cm⁻¹), and signal-to-noise ratio (SNR) comparisons.

Main Results:

  • The mSHRS devices, measuring approximately 3.5×3.5×2.5 cm and weighing 80 g, demonstrated high spectral resolution and a wide spectral range.
  • Stability, spectral resolution, and spectral range were comparable or improved compared to benchtop SHRS.
  • SNR of the mSHRS was evaluated against both benchtop SHRS and a Kaiser Holospec f/1.8 Raman spectrometer.

Conclusions:

  • Monolithic construction is a viable technique for creating compact, stable, and high-performance Raman spectrometers.
  • The mSHRS design is suitable for applications demanding high spectral resolution and portability, such as in planetary rovers.
  • Further characterization and comparison confirm the potential of mSHRS for advanced spectroscopic analysis.