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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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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 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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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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IR Spectroscopy: Molecular Vibration Overview01:24

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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.
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A Multimodal Wide-Field Fourier-Transform Raman Microscope
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Fiber-format dual-comb coherent Raman spectrometer.

Nicola Coluccelli, Christopher R Howle, Kenneth McEwan

    Optics Letters
    |November 16, 2017
    PubMed
    Summary

    We developed a compact fiber-based dual-comb coherent anti-Stokes Raman scattering (CARS) spectroscopy system. This innovative setup achieves high-resolution molecular spectra, paving the way for portable CARS spectrometers.

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    Area of Science:

    • Spectroscopy
    • Laser Physics
    • Materials Science

    Background:

    • Coherent anti-Stokes Raman scattering (CARS) spectroscopy offers high specificity for molecular analysis.
    • Traditional CARS systems often require bulky and complex instrumentation, limiting their field applicability.
    • Fiber-based laser systems provide a pathway towards miniaturization and enhanced robustness.

    Purpose of the Study:

    • To demonstrate a compact, fiber-format system for dual-comb CARS spectroscopy.
    • To achieve high spectral resolution and signal-to-noise ratio in a portable setup.
    • To explore the potential for implementing field-deployable dual-comb Raman spectrometers.

    Main Methods:

    • Utilizing two ytterbium (Yb) fiber femtosecond lasers operating at 94 MHz repetition frequency.
    • Employing a Yb amplifier and a photonic crystal fiber for spectral broadening.
    • Generating sub-20-fs pulses with a central wavelength of 1040 nm.

    Main Results:

    • Successfully observed Raman spectra of acetonitrile and ethyl acetate.
    • Achieved spectral coverage from 100 to 1300 cm-1.
    • Obtained a spectral resolution of 8 cm-1 and a signal-to-noise ratio of approximately 100 (averaged over 10 acquisitions).

    Conclusions:

    • The developed fiber-format dual-comb CARS system is effective for molecular spectral analysis.
    • The system's compact design demonstrates suitability for portable applications.
    • This technology holds promise for the development of next-generation, field-deployable CARS spectrometers.