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Related Concept Videos

Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

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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 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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The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession,...
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Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
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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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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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Related Experiment Video

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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Interferometric Laser Cooling of Atomic Rubidium.

Alexander Dunning1, Rachel Gregory1, James Bateman1

  • 1School of Physics & Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom.

Physical Review Letters
|August 29, 2015
PubMed
Summary

Researchers achieved 1D cooling of rubidium-85 atoms to 3 μK using Ramsey matter-wave interferometry. This novel pulsed cooling method shows promise for ultracold atom generation, even for atoms lacking closed transitions.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser cooling

Background:

  • Laser cooling techniques are crucial for achieving ultracold atomic samples.
  • Doppler cooling is a standard method but has limitations, especially for certain atomic species.
  • Ramsey interferometry offers a precise way to probe atomic states and dynamics.

Purpose of the Study:

  • To demonstrate a novel 1D cooling method for neutral atoms using Ramsey matter-wave interferometry.
  • To investigate the effectiveness of this pulsed cooling technique for reaching ultracold temperatures.
  • To explore its potential advantages over conventional continuous-wave Doppler cooling.

Main Methods:

  • Utilized stimulated Raman transitions between ground hyperfine states of rubidium-85 atoms.
  • Employed a velocity-dependent optical force within a Ramsey matter-wave interferometer.
  • Applied 12 cycles of the interferometer sequence to cool a freely moving atom cloud.

Main Results:

  • Successfully cooled a cloud of rubidium-85 atoms from an initial temperature of 21 μK down to 3 μK.
  • Demonstrated a pulsed analog of continuous-wave Doppler cooling.
  • Achieved cooling close to the atomic recoil limit.

Conclusions:

  • The reported Ramsey interferometry-based cooling is effective for reaching ultracold temperatures.
  • This pulsed cooling method is efficient and potentially faster than conventional techniques.
  • It offers a promising alternative for cooling atomic species that lack closed optical transitions.