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Related Concept Videos

Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

692
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...
692
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

298
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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Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

1.1K
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,...
1.1K
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

1.0K
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.
The atomizer used in AAS can be either a flame atomizer or an...
1.0K
Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Related Experiment Video

Updated: Sep 25, 2025

Atom Probe Tomography Studies on the CuIn,GaSe2 Grain Boundaries
09:51

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Characterizing atom clouds using a charge-coupled device for atom-interferometry-based G measurements.

Hua-Qing Luo, Yao-Yao Xu, Xin-Ke Chen

    Optics Express
    |April 27, 2022
    PubMed
    Summary
    This summary is machine-generated.

    Accurate characterization of atom clouds is crucial for atom interferometry. This study presents a charge-coupled device (CCD) method for precise atom cloud measurement, achieving sub-millimeter accuracy.

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    Area of Science:

    • Atomic physics
    • Quantum sensing
    • Metrology

    Background:

    • Atom interferometry requires precise knowledge of atom cloud positions and sizes.
    • Current characterization methods may lack the necessary precision for advanced G measurements.

    Purpose of the Study:

    • To develop and validate a high-precision method for characterizing atom clouds using a charge-coupled device (CCD).
    • To investigate and mitigate the influence of probe beams on atom cloud position measurements.

    Main Methods:

    • Utilizing a CCD to capture fluorescence images of atom clouds.
    • Implementing in-situ calibration with free-fall distance as a reference for imaging magnification.
    • Employing a differential measurement technique by reversing probe beam direction to correct positional errors.

    Main Results:

    • Atom cloud parameters (position, size) extracted from CCD fluorescence images.
    • Sub-millimeter precision achieved in atom cloud characterization.
    • A differential measurement method effectively suppressed probe beam influence.

    Conclusions:

    • The presented CCD-based method offers a precise and reliable approach for atom cloud characterization.
    • This technique enhances the accuracy of atom interferometry for G measurements.
    • The differential measurement strategy improves the robustness of positional data.