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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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Carrier Generation and Recombination01:22

Carrier Generation and Recombination

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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...
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Atomic Nuclei: Magnetic Resonance01:05

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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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Magnetic Field due to Moving Charges01:23

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A stationary charge creates and interacts with the electric field, while a moving charge creates a magnetic field.
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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Hyperpolarized Xenon for NMR and MRI Applications
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Carrier-Envelope Phase-Dependent Strong-Field Excitation.

D Chetty1, R D Glover1,2, X M Tong3

  • 1Centre for Quantum Dynamics, Griffith University, Brisbane, Queensland 4111, Australia.

Physical Review Letters
|May 16, 2022
PubMed
Summary
This summary is machine-generated.

The carrier-envelope phase (CEP) of laser pulses critically influences atomic excitation. Tailored laser fields can control this strong-field process, with distinct behaviors observed in multiphoton and tunneling regimes.

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Area of Science:

  • Atomic and Molecular Physics
  • Quantum Optics
  • Strong-Field Physics

Background:

  • The carrier-envelope phase (CEP) of ultrashort laser pulses is crucial for controlling light-matter interactions.
  • Understanding atomic excitation in intense laser fields requires exploring the transition between multiphoton and tunneling ionization regimes.

Purpose of the Study:

  • To investigate the influence of the CEP of few-cycle laser pulses on the atomic excitation process.
  • To examine the excitation rates of argon atoms at laser intensities straddling the multiphoton and tunneling regimes.

Main Methods:

  • Joint experimental and theoretical study.
  • Numerical simulations to model bound-state population dynamics.
  • Experimental measurements of atomic excitation rates.

Main Results:

  • The bound-state population in argon is highly sensitive to both laser intensity and CEP.
  • Experimental data show excellent agreement with theoretical predictions.
  • A clear transition in CEP-dependent behavior is observed between the multiphoton and tunneling ionization regimes.

Conclusions:

  • Precisely tailored laser fields can achieve coherent control over strong-field atomic excitation.
  • The study highlights distinct CEP effects in different ionization regimes, crucial for advanced laser control applications.