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Related Concept Videos

Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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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.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Atomic Absorption Spectroscopy: Overview01:27

Atomic Absorption Spectroscopy: Overview

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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.
When irradiated by EMR of a particular wavelength, these...
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
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Updated: Apr 12, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
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Simultaneous optimization method for absorption spectroscopy postprocessing.

Jean M Simms, Xinliang An, Mack S Brittelle

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    |May 14, 2015
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    Summary
    This summary is machine-generated.

    A new simultaneous optimization method improves accuracy and precision for absorption spectroscopy thermometry, especially for congested H2O spectra in combustion. This approach yields highly accurate results with minimal user dependence.

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    Area of Science:

    • Spectroscopy
    • Combustion diagnostics
    • Thermometry

    Background:

    • Absorption spectroscopy is crucial for thermometry, particularly in combustion.
    • Congested spectra, common in H2O absorption spectroscopy, pose challenges for traditional postprocessing.
    • Previous step-wise methods lacked optimal accuracy and user independence.

    Purpose of the Study:

    • To introduce a simultaneous optimization method for absorption spectroscopy postprocessing.
    • To enhance accuracy and precision in thermometry measurements using congested spectra.
    • To provide a more user-independent alternative to existing methods.

    Main Methods:

    • Development of a simultaneous optimization algorithm for spectral data.
    • Application of the method to H2O absorption spectroscopy in combustion environments.
    • Comparative analysis against a conventional step-wise postprocessing technique.

    Main Results:

    • The simultaneous optimization method demonstrated superior accuracy and precision compared to step-wise methods.
    • The technique proved to be more user-independent, reducing operator variability.
    • Experimental data processing from environmental and combustion chambers yielded errors around 1%.

    Conclusions:

    • Simultaneous optimization offers a significant advancement in absorption spectroscopy postprocessing.
    • The method is highly effective for thermometry in challenging, congested spectral conditions.
    • This technique provides reliable and accurate measurements for combustion and environmental applications.