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What (who) is doublet$22780$ - definition
MIXED QUANTUM STATE OF A SYSTEM WITH A SPIN OF 1/2, SUCH THAT THERE ARE TWO ALLOWED VALUES OF THE SPIN COMPONENT, −1/2 AND +1/2
Spectral doublet; Spectroscopic doublet; Spin doublet; Doublet (physics)
Marie Anne Doublet
FRENCH WRITER AND SALON-HOLDER, EDITOR
Madame Doublet
Marie Anne Doublet (23 August 1677 – May 1771), known as Doublet de Persan, Legendre, was a French scholar, writer and salonnière. She was born and died in Paris.
Doublet (lens)
![An [[achromatic doublet]]](https://commons.wikimedia.org/wiki/Special:FilePath/Achromat doublet en.svg?width=200 "An [[achromatic doublet]]")
![astigmatism]] than previous lens designs.](https://commons.wikimedia.org/wiki/Special:FilePath/Obiettivo fotografico doppio, anastigmatico, asimmetrico, a quattro lenti - Museo scienza tecnologia Milano 05924.jpg?width=200 "astigmatism]] than previous lens designs.")
TYPE OF LENS MADE UP OF TWO SIMPLE LENSES PAIRED TOGETHER
Doublet lens; Lens doublet; Doublet lenses
alt=A small brass camera lens sits at an angle on a flat white background. The front lens element is visible, facing up and to the left.
doublet
WIKIMEDIA DISAMBIGUATION PAGE
Doublets; Doublet (disambiguation)
n.
1.
Body-garment, jacket, jerkin.
2.
One of a pair.
Wikipedia
Doublet state
In quantum mechanics, a doublet is a composite quantum state of a system with an effective spin 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 two-level systems. Essentially all occurrences of doublets in nature arise from rotational symmetry; spin 1/2 is associated with the fundamental representation of the Lie group SU(2).
