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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

1.8K
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...
1.8K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.3K
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...
1.3K
IR Spectrometers01:25

IR Spectrometers

2.6K
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...
2.6K
Mass Spectrometers01:16

Mass Spectrometers

8.9K
This lesson details the instrumentation of a mass spectrometer—a physical instrument to perform mass spectrometry on analyte molecules and record the characteristic mass spectra. This is achieved via three chief functions:
8.9K
NMR Spectrometers: Overview01:20

NMR Spectrometers: Overview

2.2K
NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
2.2K
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

3.6K
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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Related Experiment Video

Updated: Feb 2, 2026

A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer

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Backscattering Raman spectroscopy using multi-grating spatial heterodyne Raman spectrometer.

Jianli Liu, Bayanheshig, Xiangdong Qi

    Applied Optics
    |November 22, 2018
    PubMed
    Summary
    This summary is machine-generated.

    A new multi-grating system enhances spatial heterodyne Raman spectrometry (SHRS), offering broader spectral range and higher resolution. This advanced technique improves material analysis for diverse samples.

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    Area of Science:

    • Spectroscopy
    • Analytical Chemistry
    • Materials Science

    Background:

    • Spatial heterodyne spectrometry (SHS) is a valuable technique for material analysis.
    • Traditional SHS systems face limitations in balancing spectral range and resolution.

    Purpose of the Study:

    • To introduce and validate a novel multi-grating spatial heterodyne Raman spectrometry (SHRS) system.
    • To overcome the spectral range-resolution trade-off inherent in traditional SHS.

    Main Methods:

    • Development of a multi-grating module replacing single gratings in SHS arms.
    • Construction and calibration of a verification system using 130 gr/mm and 150 gr/mm sub-gratings.
    • Testing backscattered Raman spectra of various targets under diverse experimental conditions.

    Main Results:

    • The multi-grating SHRS system successfully retains SHS advantages while expanding spectral range and resolution.
    • Performance is dependent on the number of sub-gratings employed.
    • The system demonstrated robust performance across various sample types and experimental parameters.

    Conclusions:

    • The proposed multi-grating SHRS system offers enhanced capabilities for Raman detection.
    • This advancement provides a powerful tool for detailed material structure and composition analysis.
    • The system shows significant potential for broad spectral range and high-resolution Raman applications.