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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...
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Inductively Coupled Plasma-Mass Spectrometry (ICP-MS): Interferences

Inductively coupled plasma–mass spectrometry (ICP–MS) is a highly selective and sensitive technique for accurate elemental analysis. Though the analysis of ICP–MS mass spectra is comparatively straightforward, it is affected by spectroscopic and non-spectroscopic interferences. Spectroscopic interferences arise when the plasma contains ionic species with an m/z value the same as the analyte ion. Spectroscopic interference can be categorized as isobaric, polyatomic ions, and refractory oxide ion...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
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Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
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Raman Spectroscopy Instrumentation: Overview

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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Rejection of Fluorescence Background in Resonance and Spontaneous Raman Microspectroscopy
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Interference effects in the Raman scattering intensity from thin films.

M Ramsteiner, C Wild, J Wagner

    Applied Optics
    |June 18, 2010
    PubMed
    Summary

    This study presents a model for interference-enhanced Raman scattering in thin films, accounting for absorption and reflections. The model accurately predicts Raman scattering intensity in multilayer structures, verified with carbon films on silicon.

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    Area of Science:

    • Materials Science
    • Spectroscopy
    • Condensed Matter Physics

    Background:

    • Raman scattering is a crucial technique for material characterization.
    • Understanding thin film optical properties is essential for device applications.
    • Accurate theoretical models are needed to interpret experimental Raman scattering data from thin films.

    Purpose of the Study:

    • To develop exact theoretical expressions for Raman scattering intensity from thin films.
    • To introduce and verify the concept of interference-enhanced Raman scattering.
    • To generalize the model for multilayer structures.

    Main Methods:

    • Derivation of theoretical expressions for Raman scattering intensity.
    • Inclusion of absorption, multiple reflections, and interference effects in the model.
    • Experimental verification using Raman scattering measurements on amorphous hydrogenated carbon films on crystalline silicon.

    Main Results:

    • Exact theoretical expressions for thin film Raman scattering were derived.
    • Interference-enhanced Raman scattering was demonstrated and experimentally verified.
    • The model was shown to be generalizable to multilayer systems.

    Conclusions:

    • The developed model accurately describes Raman scattering in thin films.
    • Interference effects significantly enhance Raman scattering signals.
    • The model provides a framework for analyzing Raman scattering in complex multilayered materials.