Birge-Mieck rule

Birge-Mieck rule

[¦bir·gə ′mēk ‚rül]
(atomic physics)
The rule that the product of the equilibrium vibrational frequency and the square of the internuclear distance is a constant for various electronic states of a diatomic molecule.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.