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Related Concept Videos

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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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).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Atomic Emission Spectroscopy: Lab01:29

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AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
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Atomic Emission Spectroscopy: Overview01:20

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Absorption Spectroscopy: Overview01:27

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Atomic absorption spectroscopy (AAS) is a technique used to analyze elements by measuring electromagnetic radiation (EMR) absorbed by atoms, which causes them to transition to a higher-energy orbit. The most crucial step in AAS is atomization, where the analyte is converted into gas-phase atoms, typically through a flame or furnace. Some of these atoms become thermally excited in the flame, while most remain in the ground state.
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Spectrophotometry: Introduction01:16

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Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
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Atomic Absorption Spectroscopy: Interference01:25

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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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Updated: Jan 1, 2026

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Baseline-free quantitative absorption spectroscopy based on cepstral analysis.

Ryan K Cole, Amanda S Makowiecki, Nazanin Hoghooghi

    Optics Express
    |December 28, 2019
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel cepstral analysis technique for absorption spectroscopy. It simplifies gas analysis by eliminating the need to correct for light source intensity variations, improving accuracy for complex spectra.

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    Area of Science:

    • Spectroscopy
    • Analytical Chemistry
    • Signal Processing

    Background:

    • Quantitative absorption spectroscopy accuracy relies on separating molecular signals from light source intensity variations.
    • Baseline correction is challenging with complex molecules or non-ideal transmission effects like etalons.

    Purpose of the Study:

    • To develop a method that removes the requirement for light source intensity correction in absorption spectroscopy.
    • To enhance the analysis of complex spectra by simplifying baseline correction.

    Main Methods:

    • A cepstral analysis approach, adapted from audio signal processing, converts transmission spectra to a modified molecular free induction decay (m-FID) signal.
    • Fitting the independent portion of the m-FID signal directly with a model to determine gas properties.

    Main Results:

    • The technique successfully eliminates the need to account for light source intensity in absorption spectroscopy.
    • Validated in complex scenarios, the method demonstrates applicability to various absorption spectrometers.
    • The approach provides a fast and accurate analysis of complex spectral data.

    Conclusions:

    • Cepstral analysis offers a robust solution for baseline correction in quantitative absorption spectroscopy.
    • This method simplifies spectral analysis, making it faster and more accurate, especially for challenging samples.
    • The technique is broadly applicable across different absorption spectroscopy setups.