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Related Concept Videos

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
Atomic Absorption Spectroscopy: Atomization Methods01:25

Atomic Absorption Spectroscopy: Atomization Methods

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 aerosol...
Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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

Atomic Absorption Spectroscopy: Radiation and Light Sources

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...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

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...

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High-speed Continuous-wave Stimulated Brillouin Scattering Spectrometer for Material Analysis
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Velocity-specific atomic-state selection in an atomic beam by continuous-wave optical pumping.

D G Steel, R A McFarlane

    Optics Letters
    |August 29, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Researchers precisely controlled atomic velocity using optical pumping between hyperfine levels. This technique achieved a 6% velocity definition, equivalent to a 1 K temperature, for specific atomic states.

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    Area of Science:

    • Atomic Physics
    • Quantum Optics

    Background:

    • Optical pumping is a technique used to alter the population distribution of atomic energy levels.
    • Hyperfine structure arises from the interaction between nuclear and electron magnetic moments, leading to closely spaced energy levels.

    Purpose of the Study:

    • To demonstrate precise control over the velocity distribution of atoms in a specific quantum state.
    • To investigate the application of optical pumping for velocity-specific atomic state selection.

    Main Methods:

    • Utilized a nearly effusive atomic beam of sodium.
    • Employed a single frequency-stabilized dye laser for optical pumping.
    • Manipulated population transfer between hyperfine split levels.

    Main Results:

    • Achieved significant modification of the atomic velocity distribution.
    • Demonstrated velocity-specific state selection with a precision of 6%.
    • The selected atomic state exhibited a local temperature of 1 K.

    Conclusions:

    • Optical pumping between hyperfine levels is an effective method for defining atomic velocity.
    • This technique enables the selection of atoms within a narrow velocity range for specific quantum states.
    • The results have implications for precision measurements and atomic manipulation in physics research.