fine-structure constant
Sign in to saveAlso known as fine structure constant, Sommerfeld's constant, Sommerfeld fine structure constant
physical constant quantifying the strength of the electromagnetic interaction between elementary charged particles
Wikidata facts
- Image
- Enrico Fermi at the blackboard.jpg
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- numeric value
- 0.0072973525693
- Commons category
- Fine-structure constant
- time of discovery or invention
- 1918-00-00
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Article
In physics, the fine-structure constant, also known as the Sommerfeld constant, commonly denoted by α (the Greek letter alpha), is a fundamental physical constant that quantifies the strength of the electromagnetic interaction between elementary charged particles.
It is a dimensionless quantity (dimensionless physical constant), independent of the system of units used, which is related to the strength of the coupling of an elementary charge e with the electromagnetic field, by the formula
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