Ms. Malghani et Dy. Smith, A THEORY OF THE MOLLWO-IVEY LAW FOR DEFECT ABSORPTION AND ITS CORRELATION TO THE STOKES SHIFT IN EMISSION, Journal of luminescence, 60-1, 1994, pp. 599-602
A Mollwo-Ivey power-law relation between host-crystal lattice paramete
r and absorption-band energy of defects in ionic solids implies a line
ar relation between defect radius and interionic separation. The Ivey
exponent represents a generalized compressibility and is correlated to
Stokes shifts as an approximate measure of relaxation.