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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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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 Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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High-dimensional atom localization via spontaneously generated coherence in a microwave-driven atomic system.

Zhiping Wang, Jinyu Chen, Benli Yu

    Optics Express
    |March 1, 2017
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate improved 2D and 3D atom localization using spontaneously generated coherence in a four-level atomic system. This method enhances detection precision and probability, enabling sub-wavelength atom localization for nanolithography applications.

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    Area of Science:

    • Atomic Physics
    • Quantum Optics
    • Nanotechnology

    Background:

    • Atom localization is crucial for precision measurements and nanolithography.
    • Spontaneous coherence generation offers novel control mechanisms in atomic systems.
    • Microwave-driven atomic systems provide a tunable platform for quantum phenomena.

    Purpose of the Study:

    • To investigate two- and three-dimensional atom localization using spontaneously generated coherence.
    • To explore the influence of system parameters on atom localization precision and probability.
    • To demonstrate sub-wavelength atom localization capabilities.

    Main Methods:

    • Utilizing a microwave-driven four-level atomic system.
    • Analyzing space-dependent atom-field interactions.
    • Adjusting system parameters: phase, amplitude, and initial population distribution.

    Main Results:

    • Significant improvements in detection probability and precision for 2D and 3D atom localization.
    • Achieved atom localization in volumes smaller than a cubic optical wavelength.
    • Demonstrated tunability via system parameter adjustments.

    Conclusions:

    • Spontaneously generated coherence enables high-precision and high-efficiency atom localization.
    • The proposed scheme offers potential applications in high-dimensional atom nanolithography.
    • This research advances control over atomic localization at the nanoscale.