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Related Concept Videos

Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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...
Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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...
Nuclear Overhauser Enhancement (NOE)01:06

Nuclear Overhauser Enhancement (NOE)

Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling. This phenomenon, called the nuclear Overhauser enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring spin-active...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...

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Updated: Jun 16, 2026

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
07:03

Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors

Published on: November 15, 2016

Stimulated emission from nuclei.

J Byrne, G I Peters, L Allen

    Applied Optics
    |February 6, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study explores stimulated emission from nuclei for zero and finite mass particles. It identifies key nuclear parameter limitations for achieving this phenomenon.

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    Last Updated: Jun 16, 2026

    Low-energy Cathodoluminescence for (Oxy)Nitride Phosphors
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    10:10

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    Published on: January 17, 2019

    Area of Science:

    • Nuclear Physics
    • Quantum Optics

    Background:

    • Stimulated emission is a fundamental quantum optical process.
    • Nuclear interactions offer a unique medium for exploring particle emission phenomena.

    Purpose of the Study:

    • To investigate the theoretical feasibility of stimulated emission from atomic nuclei.
    • To determine the constraints on nuclear parameters for enabling stimulated emission of particles.

    Main Methods:

    • Theoretical analysis of nuclear processes.
    • Quantum mechanical modeling of particle interactions within nuclei.

    Main Results:

    • The study confirms the theoretical possibility of stimulated emission from nuclei.
    • Specific limitations on nuclear parameters, such as energy levels and transition probabilities, were identified.

    Conclusions:

    • Stimulated emission of zero and finite mass particles from nuclei is feasible under specific conditions.
    • Understanding these nuclear parameter limitations is crucial for future experimental endeavors.