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Related Concept Videos

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

1.5K
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...
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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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Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

2.4K
Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...
2.4K
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

1.1K
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.
1.1K
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

1.3K
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...
1.3K
Atomic Absorption Spectroscopy: Radiation and Light Sources01:13

Atomic Absorption Spectroscopy: Radiation and Light Sources

1.0K
Atomic absorption spectroscopy (AAS) relies on the Beer-Lambert law, which requires that the radiation source emits a narrow range of wavelengths to match the absorption characteristics of the analyte atom. The primary criteria for choosing an appropriate radiation source in AAS is to provide a precise and intense emission at specific wavelengths that will allow accurate detection of the analyte.
Two common narrow-range 'line' sources used in AAS are hollow-cathode lamps (HCLs) and...
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Gradient Echo Quantum Memory in Warm Atomic Vapor
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Electromagnetically induced absorption scheme for vapor-cell atomic clock.

Denis Brazhnikov, Stepan Ignatovich, Vladislav Vishnyakov

    Optics Express
    |December 25, 2019
    PubMed
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    A novel dual-frequency light field scheme enables detection of subnatural-linewidth electromagnetically induced absorption (EIA) resonances. This method provides a frequency reference for compact atomic clocks, achieving high short-term fractional frequency stability.

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    Area of Science:

    • Atomic, Molecular, and Optical Physics
    • Quantum Optics
    • Metrology

    Background:

    • Electromagnetically Induced Absorption (EIA) is a quantum interference phenomenon.
    • Subnatural-linewidth resonances are crucial for high-precision frequency standards.
    • Existing atomic clock technologies face limitations in size and stability.

    Purpose of the Study:

    • To propose and demonstrate a dual-frequency light field scheme for detecting subnatural-linewidth EIA resonances.
    • To utilize EIA resonances as a frequency reference for developing compact atomic clocks.
    • To investigate the performance and stability of an EIA-based atomic clock.

    Main Methods:

    • Employing counterpropagating pump and probe light waves with equal circular polarizations and different intensities.
    • Tuning the frequency difference between optical fields to obtain bright-type EIA resonance.
    • Using a buffer-gas-filled Cesium (Cs) vapor cell for the experiment.

    Main Results:

    • Achieved subnatural-linewidth EIA resonances using the proposed dual-frequency scheme.
    • Demonstrated an EIA-based atomic clock with a short-term fractional frequency stability of 5.8 × 10-12τ-1/2 up to 20 s.
    • Observed agreement between experimental performance and theoretical signal-to-noise/linewidth ratio.

    Conclusions:

    • The proposed dual-frequency light field scheme is effective for detecting subnatural-linewidth EIA resonances.
    • EIA-based atomic clocks offer a promising alternative to Coherent Population Trapping (CPT) techniques.
    • This approach facilitates the development of compact and stable atomic clocks and sensors.