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The fine-structure constant α is of dimension 1 (i.e., it is simply a number) and very nearly equal to 1/137.
Biman Nath is an astrophysicist at the Raman Research Institute, Bengaluru.
The article discusses the importance of the fine structure constant in quantum mechanics, along with the brief history of how it emerged. It has the numerical value 0.007297351, with an uncertainty of 6 in the last decimal place, and as such is one of the best-measured numbers in physics. Fine and hyperfine structure of helium atom Vladimir A. Yerokhin ... -up to 8x10 12, 2 3P->2 S in 4He [P. Cancio Pastor et al., PRL 92, 023001 (2004)] • Determination of fine-structure constant and nuclear charge radius . From "Fundamental Nature of the Fine-Structure Constant" by M. Sherbon Arnold Sommerfeld introduced the fine-structure constant that determines the strength of the electromagnetic interaction.
297352533 × 1 0 − 3 ≈ 1 ∕ 137 α = e 2 [ 4 π ε 0 ] ℏ c in SI units . Determination of the fine-structure constant In particular, the uncertainty of these quantities is often determined from the uncertainty of powers of the fine-structure constant and the Rydberg constant . Fine-Structure Constant: The fine-structure constant is a part of quantum and traditional physics, a constant that represents the strength of electromagnetic forces controlling the behavior of charged particles.
2 This is the value adopted internationally for realizing representations of the volt using the Josephson effect.
The fine structure constant, alpha (α), describes how electromagnetic radiation affects charged particles. GENERAL ⎜ ARTICLE The Fine Structure Constant Biman Nath Keywords Atomic structure, quantum me-chanics, fine structure constant. Four direct measurements of the fine-structure constant 13 billion years ago. Fine-structure constant definition is - a dimensionless constant that is a measure of the strength of electromagnetic interactions of subatomic particles and that has an … 1 The values are given in the so-called concise form; the number in brackets is the standard uncertainty, which is the value multiplied by the relative standard uncertainty. Observations of the redshift z = 7.085 quasar J1120+0641 are used to search for variations of the fine structure constant, a, over the redshift range 5:5 to 7:1. These are the most distant direct measurements of a to date and the first measurements using a near-IR spectrograph. Observations at z = 7:1 probe the physics of the universe at only 0.8 billion years old. The fine structure constant is a combination of four other fundamental constants: the speed of light, the charge on the electron, Planck’s constant, and the permittivity of free space. From the exponential function of Euler’s equation to the geometry of a fundamental form, a calculation of the fine-structure constant and its relationship to the proton-electron mass ratio is given. Current advances: The fine-structure constant and quantum Hall effect . Notes [].
Science Advances , 2020; 6 (17): eaay9672 DOI: 10.1126/sciadv.aay9672 Cite This Page :
An important dimensionless parameter in atomic, molecular, and optical physics is the fine structure constant, α: (3.96) α = e 2 ℏ c = 7 . It is the "coupling constant" or measure of the strength of the electromagnetic force that governs how electrically charged elementary particles (e.g., electron, muon) and light (photons) interact.
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