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(atomic physics)
A unit of energy used in atomic physics, equal to the square of the charge of the electron divided by twice the Bohr radius; equal to 13.605698 ± 0.000004 electronvolts. Symbolized ry.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(Ry), a subsidiary unit of energy used in atomic physics and optics. It was named in honor of J. R. Rydberg. It is defined by the equation 1 Ry = hcR, where h is Planck’s constant, c is the velocity of light, and R is the Rydberg constant; numerically, 1 Ry = 13.60 electron volts—that is, 1 Rydberg is equal to the ionization energy of an atom of hydrogen. The Rydberg is a convenient unit for measuring the energy of atomic states. In the Hartree atomic system of units, 1 Ry is equal to one-half of an energy unit; in the centimeter-gram-second system, 1 Ry = 2.1796 × 10-11 erg.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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