What does Á stand for?

Fine-Structure Constant (Greek nomenclature; finite figure used in quantum mechanics to measure energy)

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

In recent years, astrophysical data have indicated that the fine-structure constant called alpha has increased since the early universe.

Terrific timekeeper: optical atomic clock beats world standard

Pepper, New Method for High-Accuracy Determination of the Fine-Structure Constant Based on Quantized Hall Resistance, Phys.

Temperature dependence of the Hall and longitudinal resistances in a ...

Since 2001, Flambaum and his colleagues have presented growing evidence that another constant, known as alpha or the fine-structure constant, has also varied (SN: 10/6/01, p.

Universe in Flux: constant of nature might have changed

Shortly after the Oklo fossil reactor was discovered, researchers recognized that it might provide data that could help them learn about the number called alpha, also known as the fine-structure constant, that's associated with the strength of the electromagnetic force.

Primordial nukes: the 2-billion-year-old tale of Earth's natural ...

The lead article in the annual Buyer's Guide of the American Institute of Physics features five pages of values of the fundamental physical constants, such as the speed of light, the Newtonian constant of gravitation, the Planck constant, the fine-structure constant, and energy-unit conversion factors.

Buyers guide features NIST Data product. (General Developments)

Researchers know that the constant under scrutiny, called the fine-structure constant or alpha, determines the wavelengths of light that atoms can absorb.

Fundamental constant didn't vary after all

It will serve as a "turnkey" primary representation for capacitance, provide an additional route for the measurement of the fine-structure constant and provide a means to close the "quantum metrology triangle" formed by the Josephson voltage, the quantum Hall resistance, and the fundamental electron charge.

Nist researchers complete uncertainty analysis for linking ECCS to SI ...

Besides providing a "turnkey" primary capacitance representation, the ECCS will also provide an alternate route for experimental determination of the fine-structure constant.

NIST researchers two steps closer to electron-counting capacitance ...