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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

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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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Tandem Mass Spectrometry01:21

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Two-Dimensional (2D) NMR: Overview01:12

Two-Dimensional (2D) NMR: Overview

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The 1D NMR spectrum of large and complex molecules like natural products has complicated splitting patterns and overlapping signals, which can be easily interpreted using 2-dimensional (2D) NMR. Unlike 1D NMR, 2D NMR has two frequency axes that provide the coupling information between the nucleus A and nucleus B in a molecule. The process from which 2D spectra are obtained has four steps.
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Gas chromatography–mass spectrometry (GC–MS) is the combination of analytical techniques of gas chromatography and mass spectrometry in a single instrument for analyzing a mixture of compounds. The gas chromatograph separates the compounds in the mixture, and the mass spectrometer analyzes each compound separately to determine the molecular masses and molecular structures.
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Dual-track spectrometer design for 1D gas-phase Raman spectroscopy.

Konrad Koschnick, Alison M Ferris, Johannes Lill

    Optics Express
    |November 14, 2024
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    Summary
    This summary is machine-generated.

    A novel 1D gas-phase Raman spectrometer design uses a single CCD chip for enhanced measurements. This new design improves background suppression and local gas-phase temperature accuracy in challenging flow scenarios.

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    Area of Science:

    • Spectroscopy
    • Optical Instrumentation
    • Chemical Engineering

    Background:

    • Traditional Raman spectrometers often require complex setups with switchable filters or multiple devices.
    • Achieving both polarization separation and dual-resolution measurements simultaneously presents a significant challenge.

    Purpose of the Study:

    • To introduce a new 1D gas-phase Raman spectrometer design.
    • To demonstrate the advantages of a single charge-coupled device (CCD) chip for simultaneous, multi-property signal imaging.
    • To validate the instrument's performance in challenging flow environments.

    Main Methods:

    • Development of a novel 1D gas-phase Raman spectrometer with two dedicated tracks on a single CCD chip.
    • Implementation of two configurations: polarization-separation and dual-resolution.
    • Experimental validation in two flow scenarios: near a heated surface and in a confined channel flow.

    Main Results:

    • The polarization-separation configuration effectively suppressed background thermal radiation.
    • The dual-resolution configuration enabled accurate measurement of local gas-phase temperatures.
    • The spectrometer achieved a maximum spatial resolution of 21.9 lp/mm along the 1D probe volume.

    Conclusions:

    • The new spectrometer design offers significant advantages over traditional systems by eliminating signal drift and minimizing calibration issues.
    • The instrument demonstrates robust performance in suppressing background radiation and accurately measuring gas-phase temperatures.
    • This innovative design enhances the capabilities of 1D gas-phase Raman spectroscopy for complex flow analysis.