extreme narrowing approximation

extreme narrowing approximation

[ek′strēm ′nar·ə·wiŋ ə‚präk·sə′mā·shən]

(spectroscopy)

A mathematical approximation in the theory of spectral-line shapes to the effect that the exchange narrowing of a perturbation is complete.

McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.