232:. The strength and frequency of the emitted radio waves allows the concentration of such nuclei to be measured. Another potential application is the use of doublets as the emitting layer in light emitting diodes (LEDs). These materials have the advantage of having 100% theoretical quantum efficiency based on spin statistics whereas singlet systems and triplet systems have significantly lower efficiencies or rely on noble metals such as Pt and Ir to emit light.
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observations, allowing astronomers to deduce the existence of, and measure the strength of magnetic fields around the Sun, stars and galaxies. Conversely, it was the observation of doublets in spectroscopy that allowed physicists to deduce that the
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Imran, Muhammad; Wehrmann, Caleb; Chen, Mark (2020). "Open-Shell
Effects on Optoelectronic Properties: Antiambipolar Charge Transport and Anti-Kasha Doublet Emission from a N-Substituted Bisphenalenyl".
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of 1/2, such that there are two allowed values of the spin component, −1/2 and +1/2. Quantum systems with two possible states are sometimes called
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had a spin, and that furthermore, the magnitude of the spin had to be 1/2. See the history section of the article on
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The term "doublet" dates back to the early 19th century, when it was observed that certain
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of an ionized, excited gas would split into two under the influence of a strong
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Doublets continue to play an important role in physics. For example, the
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is a composite quantum state of a system with an effective
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